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Red Eagle Formation

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Stratigraphic Sections

The following stratigraphic sections of Red Eagle beds are shown on Figure 1. They are numbered consecutively from north to south.

(1) Sec. 10, T. 8 N., R. 8 E., Lancaster County, Nebraska. Along a cut bank in the Little Nemaha Valley about one-fourth mile southwest of Bennet, Nebraska. Thickness,
Red Eagle limestone (10.55 feet exposed)
Howe limestone member (2.3 feet exposed)
12. Limestone, brown, deeply weathered, slabbyexposed
11. Limestone, brown, dolomitic, massive0.8
Bennett shale member (7.75 feet)
10. Shale, yellow to tan, slightly dolomitic, blocky1.65
9. Shale, olive-gray, mottled, slightly dolomitic, harder than unit 10, blocky1.8
8. Limestone, dove-gray, impure, vesicular, somewhat slabby1.2
grades into
7. Shale, gray, clayey0.4
6. Limestone, dove-gray, dolomitic0.3
grades into
5. Shale, black; Orbiculoidea, Lingula0.4
4. Limestone, olive-gray, dolomitic, shaly, blocky0.4
grades into
3. Limestone, dark-gray, dolomitic0.3
2. Shale, black; Orbiculoidea sparse in lower part and more abundant in upper part1.3
Glenrock limestone member
1. Limestone, yellowish-gray, forming pavement in creekexposed
Note: About a mile eastward in the same valley the Glenrock is 0.7 to 1.3 feet thick and contains fusulinids in its upper part and lobate algal masses in the lower part.
(2) Near SE cor. NE NW sec. 21, T. 4 S., R. 9 E., Marshall County, Kansas. On Kansas highway 99 one-fourth mile south of Frankfort. Thickness,
Red Eagle limestone (11.7 feet exposed)
Howe limestone member (4 feet exposed)
7. Limestone, buff to yellow, weathers spongy with network of calcite and quartz veinlets in brownish-ochre ground mass; dolomitic; fossils are not identifiableexposed
6. Limestone, buff, dolomitic, shaly, soft3.0
Bennett shale member (5.2 feet)
5. Shale, gray, calcareous1.5
4. Shale, dark-gray; Orbiculoidea1.0
3. Shale, black, fissile2.0
2. Shale, gray0.7
Glenrock limestone member
1. Limestone, yellow to tan, hard; abundant fusulinids in upper part; ostracodes, gastropods, bryozoans, other shell fragments, foraminifers, and algae in lower part2.5
(3) NW NE sec. 24, T. 10 S., R. 7 E., Riley County, Kansas. In Rock Island Railroad cut about 200 feet north of U.S. highway 40. Thickness,
Red Eagle limestone (11.0 feet exposed)
Howe limestone member
8. Limestone, buff, dolomitic, massive to cellular; poorly preserved tiny snails and foraminifersexposed
Bennett shale member (6.4 feet)
7. Limestone, buff, shaly, dolomitic, weathers platy2.0
6. Shale, dark-gray, weathers gray, calcareous to clayey1.2
5. Shale, black, thin-bedded; Orbiculoidea0.4
4. Shale, gray and black mottled, weathers gray to mottled gray and tan2.4
3. Shale, tan, weathers light-gray, calcareous, platy0.4
Glenrock limestone member (1.6 feet)
2. Limestone, light tannish-gray, weathers tan to buff, massive; abundant fusulinids0.7
1. Limestone, light-tan to gray, detrital limestone, and shale fragments0.9
Note: Beds 3-6 (Bennett shale member) contain, in addition to Orbiculoidea, bryozoans, crinoid and echinoid fragments, Ambocoelia, Wellerella, Composita, Hustedia, Chonetes, and Chonetes.
(4) Near Cen. N. line NW sec. 20, T. 10 S., R. 8 E., Riley County, Kansas. On K Hill, Manhattan. Thickness,
Grenola limestone
Sallyards limestone member
20. Limestone, poorly exposed  
Roca shale (22 feet)
19. Shale, several shades of green, blocky; contains abundant limy nodules9.0
18. Shale, grades from dark-purple in upper part through light- and dark-green and blue-green, to burnt-red to green in basal part; blocky; contains abundant limy nodules in middle partaverages
17. Shale, green with red tint, massive to thin-bedded; locally contains a hard mudstone0.8
16. Limestone, medium-gray, dense; contains clear crystalline calcite specks and irregular veins; slightly laminated in basal part; where thickest comprises two lenticular flattened discoidal beds; algal (?)averages
15. Shale, green, massive0.5
14. Shale, bright burnt-red, thinly laminated, bedding contorted locally, siltyaverages
13. Shale, green, olive, and maroon, poorly exposed1.8
Red Eagle limestone (10.2 feet)
Howe limestone member
12. Limestone, buff to yellow peppered with black, partly dark-gray streaked with green; lower part gray to buff; porous, brecciated-appearing; crinoid and brachiopod fragments, small high-spired and low-coiled snails, algae (?)2.8
Bennett shale member (5.8 feet)
11. Limestone, medium-gray, weathers tan, shalyaverages
10. Limestone, medium-gray, weathers light-tan to tannish-gray, thin-bedded, somewhat oatmeal-like texture, abundantly fossiliferous; echinoid and crinoid fragments, productids, Neospirifer and other brachiopods1.4
9. Shale, gray, upper part chalky, massive; Ambocoelia, Composita, productids and other brachiopodsaverages
8. Shale, gray, harder and more limy than unit 9; Ambocoelia, Composita, Wellerella, and other brachiopodsaverages
7. Shale, black, gray, and tan mottled, thin-bedded to fissile, fossils more abundant in lower part; Orbiculoidea, Ambocoelia, Wellerella1.5
Glenrock limestone member
6. Limestone, light-gray, rusty splotches and streaks, tan to black at top; contains abundant Orbiculoidea in top crust; Wellerella, Ambocoelia, and small snails1.6
Johnson shale (19.3 feet)
5. Shale, gray, tan, olive, and black, thin-bedded to blocky; contains mud cracks, poorly preserved plant fragments, and ostracodes2.7
4. Shale, green, gray, olive, and specks of maroon, blocky, calcareous11.0
3. Mudstone, green to gray, dense, semilitholographicaverages
2. Shale, green, olive, and gray, blocky, calcareous4.3
Foraker limestone
Long Creek limestone member
1. Limestone  
(5) NE NE sec. 10, T. 12 S., R. 10 E., Wabaunsee County, Kansas. About 1 mile north of Alma. Thickness,
Roca shale (16.45 feet exposed)
14. Shale, deeply weatheredexposed
13. Limestone, gray, brecciated, algal (?)3.6
12. Shale, gray0.2
11. Mudstone, ashy gray, dense0.3
grades into
10. Shale, ashy gray, brecciated, part weathers as "boxwork"2.4
grades into
9. Mudstone or limestone, ashy gray, dense0.25
grades into
8. Shale, gray, limy, hard1.3
grades into
7. Shale, brownish-gray, limohite-stained, somewhat micaceous2.2
6. Mudstone, gray, calcareous, nonlaminated1.0
5. Shale, gray and yellow, somewhat blocky3.7
Red Eagle limestone (5.35 feet exposed)
Howe limestone member
4. Limestone, purplish; spergenite of tiny gastropods, foraminifers, oolites, encrusting algae, and brachiopod fragments0.85
Bennett shale member (4.5 feet exposed)
3. Shale, gray, clayey in upper part, limy and hard below0.5
2. Limestone, brown; contains crystalline red quartz and colorless calcite; locally nearly all drusy calcite; locally color is dove-gray with flecks of red chert1.0
1. Shale, gray, largely coveredexposed
Note: In the area of this exposure, in the vicinity of Alma, the Orbimloidea-bearing part of the Bennett shale and the Glenrock limestone are absent. The base of the Red Eagle formation is placed at the base of dark-gray or black shale that elsewhere is recognized as a part of the Bennett shale.
(6) SW SW sec. 30, T. 11 S., R. 12 E., Wabaunsee County, Kansas. On Kansas highway 10 near Paxico. Modified from section measured by M. R. Mudge and Robert Burton. Thickness,
Red Eagle limestone (12.4 feet)
Howe limestone member (2.7 feet)
30. Limestone, tan, soft, massive, porous; contains geodes in upper part; spergenite of tiny snails, foraminifers, oolites, and ostracodes1.4
29. Limestone, gray-orange, weathers tan, wavy bedded; contains small silicified "rosettes" in lower part; ostracodes, tiny snails, Pleurophorous, Ambocoelia1.3
Bennett shale member (9.7 feet)
28. Limestone, red-brown, weathers gray-orange, dolomitic, shaly, massive to lenticular; contains scattered siliceous or cherty nodules1.55
27. Shale, gray-brown, weathers tan, thin-bedded; echinoid spines, bryozoans, brachiopods2.65
26. Limestone, gray-orange, weathers tan and platy, argillaceous; Orbiculoidea, crinoid fragments0.5
25. Shale, olive-drab to dark gray-brown, locally nearly black, weathers tan to blue-gray, calcareous, thin-bedded to fissile; large Crania, abundant Orbiculoidea and Ambocoelia5.0
Glenrock limestone member (2.0 feet)
24. Limestone, tan, limonite-stained, massive, abundant fusulinids, brachiopod fragments, encrusting algae, Ambocoelia, Aviculopecten1.3
23. Limestone, tan, detrital; contains abundant pebbly material0.7
Johnson shale (23.7 feet)
22. Shale, upper 0.5 foot tan, remainder olive-drab mottled with black; weathers tan to bluish-gray; thin-bedded to fissile; part blocky; carbonaceous; contains plant fragments and small macerated ostracodes6.0
21. Limestone or mudstone, gray, iron-stained, platy4.0
20. Shale, gray, gray-green, and olive-drab with purple mottling near top, thin-bedded to blocky and massive, lower part silty and contains limy nodules13.7
Foraker limestone (43.65 feet)
Long Creek limestone member (8.4 feet)
19. Limestone, red-brown, weathers orange-gray, soft, dolomitic, massive; contains calcite-lined cavities; 0.8-foot celestite layer at top5.4
18. Limestone, dark-gray with brown specks, weathers bluish-gray, blocky, argillaceous3.0
Hughes Creek shale member (32.85 feet)
17. Shale, upper part olive-drab to black, lower 1.8 feet dark-gray; weathers bluish-gray; thin-bedded to blocky; lower part contains abundant fusulinids, crinoid fragments, and brachiopods5.3
16. Limestone, blue-gray, weathers tan, upper part weathers platy; abundant fusulinids, bryozoans, brachiopods1.0
15. Shale, dark-gray to black, weathers bluish-gray, fissile; Ambocoelia2.3
14. Limestone, dark-gray, weathers tan, massive; fusulinids, echinoid and crinoid fragments0.8
13. Shale, upper part olive-drab, weathers tan; lower part black, weathers blue-gray1.45
12. Shale, dark-gray, weathers light bluish-gray, thin-bedded to platy; crinoid fragments, fusulinids, brachiopods, bryozoans2.95
11. Limestone, dark-gray, weathers gray, massive, weathers platy0.2
10. Shale, black, weathers bluish-gray, fissile; abundant Ambocoelia1.5
9. Limestone, tan, hard, massive0.5
8. Shale, dark-gray, fissile; Linoproductus, fusulinids0.5
7. Limestone, bluish-gray, weathers tan, massive, weathers platy; crinoid and echinoid fragments0.9
6. Shale, dark bluish-gray, weathers gray, thin-bedded to fissile5.0
5. Shale, gray, weathers tan-gray, very calcareous, thin-bedded to platy; Aviculopecten, Neospirifer, Dictyoclostus, Linoproductus, Ambocoelia, Chonetes, Marginifera, and worm borings (?)2.8
4. Shale, gray-brown and mottled, weathers tan, lower 0.6 foot gray and weathers lighter in color; thin-bedded to blocky; Composita and crinoid fragments in lower part7.65
Americus limestone member (2.4 feet)
3. Limestone, gray to tannish-gray; Composita, fragments of echinoderms and other fossils1.2
2. Shale, gray, weathers tan, silty, calcareous, thin-bedded0.2
1. Limestone, tan, weathers tan-gray, massive, blocky; micro-fossils1.0
(7) SW NE sec. 11, T. 12 S., R. 10 E., Wahaunsee County, Kansas. On Mill Creek about 1 mile northeast of Alma. Thickness,
Grenola limestone (6.2 feet exposed)
Salem Point shale member
27. Shale, gray, weatheredexposed
Sallyards limestone member
26. Limestone, ashy gray, weathers slightly rusty; algae-coated clams1.2
Roca shale (26.45 feet)
25. Shale, yellowish-gray, clayey, blocky2.3
24. Mudstone, light-gray; ostracodes in upper part0.65
23. Shale, olive-gray, blocky5.4
22. Limestone nodules, bluish, dense, and nearly black and some reddish clay; more clayey in lower part; algae (?)2.8
21. Shale, bluish-gray, flaky1.2
grades into
20. Clay and limestone nodules; massive limestone in lower part, mottled, has worm-eaten appearance4.6
19. Shale, greenish-gray1.4
18. Shale or clay, red1.8
17. Limestone, dark-gray, slabby and nodular0.3
16. Shale, gray2.0
15. Shale, gray, limy; locally resistant dense limestone1.0
14. Shale, yellowish-gray grading into greenish in lower part, flaky3.0
Red Eagle limestone (13.9 feet)
Howe limestone member
13. Limestone, brownish, weathers gray, finely crystalline; spergenite0.7
Bennett shale member (13.2 feet)
12. Shale, yellowish-gray, weathers light-gray, mottled dark to black and gray in lower part; limonitic in lower part11.3
grades into
11. Shale, black and mottled black and tannish-gray1.9
grades into
Johnson shale (17.7 feet)
10. Shale or mudstone, gray, hard1.9
9. Mudstone, slate-gray, weathers lighter and rough, lower part brecciated1.2
grades into
8. Shale, yellowish-gray, basal part olive-green, blocky, part hard and resistant14.6
Foraker limestone (13.35 feet exposed)
Long Creek limestone member (9.35 feet)
7. Limestone, yellow and gray, crystalline; contains some red chert and crystalline quartz; slabby; pitted on weathered surfaces1.5
6. Shale, gray, clayey3.3
5. Shale or limestone, gray, platy2.0
grades into
4. Limestone, brown, weathers yellow1.5
3. Shale, gray0.05
2. Limestone, gray, rough-weathering, pitted1.0
Hughes Creek shale member
1. Shale, grayexposed
Note: In this area the Glenrock limestone is absent. The base of the Red Eagle formation is placed at the base of beds that elsewhere are recognized as a part of the Bennett shale.
(8) NW NW sec.13, T. 13 S., R. 12 E., Wabaunsee County, Kansas (2.5 miles south of Keene). Thickness,
Roca shale
5. Shale, gray and green, deeply weathered, contains limy nodulesexposed
Red Eagle limestone (5.4 feet exposed)
Howe limestone member
4. Limestone, purplish-brown; spergenite of foraminifers, gastropods, oolites, and algae0.8
Bennett shale member (4.6 feet exposed)
3. Shale, gray0.2
2. Limestone, brown, crystalline0.4
1. Shale, yellowish-grayexposed
Note: In the area of this exposure the Glenrock limestone and the Orbiculoidea bearing lower part of the Bennett shale are absent.
(9) NE NE sec. 12, T. 15 S., R. 11 E., Wabaunsee County, Kansas. Along Locust Creek about 6 miles south and 1 mile west of Eskridge. Thickness,
Red Eagle limestone (18.8 feet exposed)
Bennett shale member (17.8 feet exposed)
4. Limestone, light-gray to nearly white; sparse chert nodules mostly in upper and middle parts; styolites; fractured and cut by solution channels; sparse echinoderm and brachiopod fragments in upper part; lower 3 feet contains sparse fusulinids and tabulate corals and fairly abundant algal coloniesexposed
3. Limestone, light brownish-gray; sparse crinoid fragments, abundant brown chitinous fragments of Orbiculoidea, and conodonts (?)0.7
2. Shale, light-gray, lower part dark-gray and olive mottled, upper part highly calcareous3.9
Glenrock limestone member
1. Limestone, light-tan to light gray-tan; abundant fusulinidsexposed
(10) NE NE SW sec. 23, T. 15 S., R. 11 E., Lyon County, Kansas, on the Hoffman Ranch. Thickness,
Red Eagle limestone (33.15 feet)
Howe limestone member
7. Limestone, light-gray, weathers into pitted rounded boulders; massive outcrop around hill; spergenite of oolites, foraminifers, gastropods, algae, sparse brachiopods, and other fossilsaverages
Bennett shale member (27.95 feet)
6. Limestone, light-gray, in part limestone breccia, part coarse crystalline crinoidal limestone, part weathers shaly to nodular; unbroken crinoid columnals up to 1 foot in length; large brachiopods12.2
5. Limestone, light-gray to nearly white, dolomitic, massive, porous, cavernous, cherty13.9
4. Limestone, light-gray; contains an abundance of red-brown Orbiculoidea0.5
3. Shale, gray, blocky and calcareous in upper part, lower part black to dark-gray, fissile; Orbiculoidea1.35
Glenrock limestone member
2. Limestone, tan to light-gray; abundant fusulinids0.2
Johnson shale
1. Shale, gray, becomes blocky and calcareous downwardexposed
(11) Along W. line NW SW sec. 35, T. 15 S., R. 11 E., Lyon County, Kansas. On county road 3 miles north of Allen. Thickness,
Grenola limestone (11.3 feet exposed)
Burr limestone member (2.3 feet exposed)
25. Limestone, brown, with specks of light-gray in lower part, pebbles or inclusions of light-gray limestone up to 1 foot in length in part of bed; Pseudomonotis, Aviculopecten, Myalina, and other clams, rhomboporid and fenestellid bryozoansexposed
24. Shale, silty and limy, locally weathers as limestone; contains crinoid fragments, rhomboporid and fenestillid bryozoans, Allerisma, Pseudomonotis, and Neospirifer0.7
grades into
23. Limestone or siltstone, gray, mottled, shaly; fossils as in unit 250.5
Legion shale member (8.7 feet)
22. Shale, tan, calcareous, contains large nodules and vertical stringers of chert and fine crystalline quartz; limy nodules and plates in upper part8.2
21. Shale, dark-gray to black, limy zone at top, subfissile0.5
Sallyards limestone member
20. Limestone, gray, mottled, shaly; crinoid fragments, Aviculopecten, Pseudomonotis, and other clams0.3
Roca shale (21.1 feet)
19. Shale, light and dark greenish-gray and tan, calcareous, nodular to blocky9.5
18. Shale, dark-green, calcareous, blocky1.2
grades into
17. Limestone or marl, greenish tint, green clayey veinlets, lithographic2.1
16. Shale, red, purple, and green; contains limy nodules; blocky; partly covered3.5
15. Limestone, light-gray, green tint, part lithographic, secondary calcite specks, laminated, algal-like structures2.6
14. Shale, green, calcareous, silty, platy bedding2.2
Red Eagle limestone (14.1 feet)
Howe limestone member (4.4 feet)
13. Limestone, gray and greenish, crenulated, almost entirely Cryptozoon-like algae up to 1 foot in diameter and 0.1 to 0.5 foot thickaverages
12. Limestone, light-gray; upper part dense, suboolitic; lower is spergenite of snails and clams, oolites, algae, ostracodes, fusulinids, and other foraminifers, echinoderm and bryozoan fragments; upper 0.3 to 0.8 foot separated from lower part by very thin clay parting2.8
11. Limestone, light-gray, fragmental and crystalline, locally dense; foraminifers, snails, clams, crinoid fragments, and algae0.9
10. Limestone, gray and greenish; echinoderm fragments, algae0.3
Bennett shale member (8.8 feet)
9. Shale, tan and gray, calcareous, thin-bedded, very fossiliferous in upper part; echinoderm spines, crinoid fragments, Neospirifer and sparse other brachiopods5.8
grades into
8. Limestone, light- to dark-gray, silty; somewhat sparse crinoids, bryozoans, and brachiopod fragments1.2
7. Limestone, mottled light- and dark-gray, weathers light-gray; contains sparse chert in upper part; Orbiculoidea, fusulinids, Hustedia, shark teeth, and algae (?)1.3
6. Shale; upper part gray, contains Hustedia, Wellerella, Chonetes, Ambocoelia, Derbyia, Marginifera, Orbiculoidea; lower part brown, is a coquina of Orbiculoidea0.5
Glenrock limestone member
5. Limestone, gray to brownish; contains small pebblelike masses of gray and brown limestone; abundant fusulinids; Marginifera and Orbiculoidea in top crust of bed0.9
Johnson shale (6.8 feet exposed)
4. Shale, gray to tan, argillaceous, blocky0.7
grades into
3. Shale, gray to tan and olive, calcareous, thin- to medium-bedded, blocky2.0
2. Shale, dark-gray to black, subfissile; contains carbonized plant fragments, small white snails1.2
1. Siltstone and impure limestone, gray in upper part grading downward into tan, weathers slabbyexposed
(12) Along N. line NE sec. 17, T. 18 S., R. 10 E., Lyon County, Kansas, 3 miles west and 1 mile south of Americus. Thickness,
Red Eagle limestone (13.5 feet exposed)
Howe limestone member
9. Limestone, light-gray, weathers to drab grayish-brown, a spergenite, very hard, medium to coarsely crystallineexposed
Bennett shale member (12.0 feet)
8. Shale, olive, clayey to silty; bryozoans, pelecypods, Chonetes, Composita, Juresania, and abundant Meekella and Derbyia3.4
7. Shale, yellow to buff; bryozoans, Derbyia, Chonetes, Composita, Juresania, and Dictyoclostus3.7
6. Limestone, light-gray to light-tan, no color change when weathered, porous, algal (?)2.5
5. Limestone, mottled gray, shaly and slabby; abundant fusulinids, bryozoans, and crinoid fragments0.7
4. Shale, brown, clayey, thin-bedded; sparse fusulinids and abundant Crurithyris0.6
3. Shale, gray, calcareous; fusulinids, Crurithyris, and Orbiculoidea1.1
Glenrock limestone member
2. Limestone, dark-gray, mottled, weathers tan; very abundant fusulinids0.4
Johnson shale
1. Mudstone, light tannish-gray, calcareousexposed
(13) Near Cen. sec. 26, T. 19 S., R. 7 E., Chase County, Kansas. On Elmdale hill. Thickness,
Grenola limestone (40.8 feet exposed)
Neva limestone member (11.0 feet exposed)
75. Limestone, light-gray, cavernous, brecciated in part, massiveexposed
74. Limestone, light-gray, styolites in upper part, lower part wavy bedded, sparsely fossiliferous throughout; contains fusulinids in lower part1.6
73. Shale, gray; locally contains thin fusulinid-bearing limestone and brachiopods0.35
72. Limestone and shale, slabby limestone mostly in upper half, partly a mass of shell fragments0.2
71. Limestone, yellow-gray, powdery; crust of Crurithyris at top; fusulinids, bryozoans, and brachiopods0.5-0.7
70. Shale, gray, limy0.4
69. Limestone, light-gray; small fossil fragments0.35
68. Shale, brownish-gray; bryozoans, corals, crinoid fragments, Lissochonetes, and shark teeth0.8
67. Limestone, yellowish-gray, "oatmeal" rock; fusulinids0.5
66. Limestone, light-gray, flecked with white, one massive bed1.3
Salem Point shale member (7.1 feet)
65. Limestone and shale, gray, nodular, cross-bedded0.5
64. Shale, greenish-gray; upper part clayey; limy with thin limestone beds in lower middle part; black streak approximately 1 foot from base6.6
Burr limestone member (12.05 feet)
63. Limestone, gray, upper 0.35 foot crystalline, lower part soft, silty, and laminated; mud cracks on upper surface1.4
62. Shale, medium dark-gray to greenish-gray3.5
61. Limestone, medium light-gray, upper 0.6 to 0.8 foot more massive, lower part slabby and laminated2.0
60. Shale and limestone, gray; upper half calcareous; lower mostly powdery laminated limestone0.8
59. Limestone, medium-gray, weathers slightly tan, yellow shale break 0.3 foot from top, even platy beds, "flagstone"1.9
58. Shale, gray, limy; pelecypods and small discoidal algal colonies0.3
57. Limestone, Portland cement gray; flattened fossil fragments and clams0.8
56. Shale, gray, calcareous; clams0.4
55. Limestone, light-gray; Aviculopecten and Myalina0.5
54. Shale, dark-gray; clams0.15
53. Limestone, medium-gray; clams0.3
Legion shale member (8.1 feet)
52. Shale, black, papery0.3
51. Shale, with platy limestone in upper middle part, dark-gray; lower part is darker, well-bedded to drab; black shale 0.75 foot from base; upper part fossiliferous, brachiopods especially abundant7.8
Sallyards limestone member (2.55 feet)
50. Limestone, light-gray, crystalline, hard; clams0.25
49. Shale, drab; Aviculopecten and other clams0.5
48. Limestone, gray to drab; clams0.7
47. Shale and limestone, gray; upper half mostly shale, lower mostly limestone; clams0.7
46. Shale, gray, calcareous0.1
45. Limestone, light-gray, platy, partly light-gray limy shale; clams0.3
Roca shale (16.75 feet)
44. Shale, slightly calcareous; contains sparse clams0.7
43. Shale, middle part covered; upper 2 feet is greenish-gray, blocky, and limy; lower 3 feet dark to purplish-gray and contains limy nodules8.75
42. Limestone, gray, impure, nodular0.2-0.3
41. Shale, dark-gray, limy; nodules more abundant in lower part1.7
40. Limestone, gray, impure, nodular1.0-1.5
39. Shale, red, clayey1.3
38. Limestone, gray, nodularaverages
37. Covered interval2.0
Red Eagle limestone (12.85 feet)
Howe limestone member (1.5 feet)
36. Limestone, medium dark-gray, weathers brown and yellow, somewhat laminated; a spergenite of foraminifers; ostracodes in upper part1.0
35. Limestone, gray, soft0.5
Bennett shale member (10.6 feet)
34. Shale, yellow and gray, somewhat limy in upper part; abundant fossils especially in lower and middle parts, largely Chonetes and echinoid spines3.85
33. Limestone, nearly white, locally weathers pinkish-yellow, chalky, brecciated, cavernous; crinoids, brachiopods, and gastropods5.15
32. Limestone, buff, granular; fusulinids0.8
31. Shale, gray, variable thickness; bryozoansaverages
Glenrock limestone member
30. Limestone, dark-gray, hard, massive; Osagia-like algae0.75
Johnson shale (20.9 feet)
29. Shale; upper approximate 1 foot black to brownish, remainder gray, blocky; approximately 1 foot of platy limy beds about 4 feet from top11.4
28. Limestone, buff, weathers brownish, platy, conchoidal fracture1.8-2.0
27. Covered interval7.5
Foraker limestone (43.2 feet)
Long Creek limestone member (7.7 feet)
26. Limestone, yellowish-gray to medium-gray, slightly granular; ripple-marked upper surface0.5
25. Shale, gray, limy0.5
24. Limestone, yellow, granular0.5
(Locally units 24, 25, and 26 are nearly solid limestone)
23. Covered interval1.5
22. Limestone, gray and yellow, deeply weathered0.5
21. Limestone, drab-gray, granular, massive; Osagia-like algae0.8
20. Limestone, yellow, granular, massive1.2
19. Limestone, gray, slabby0.5
18. Limestone, yellow, granular; Osagia-like algae1.7
Hughes Creek shale member (23.35 feet)
17. Shale, dark-gray; abundant fusulinids0.95
16. Limestone, ashy gray, soft, weathers into rounded-off outcrop; abundant fusulinids2.5
15. Shale, gray, limy; fusulinids1.0
14. Covered interval4.5
13. Limestone, gray, blocky; fusulinids1.3
12. Covered interval8.45
11. Shale, dark-gray, abundantly fossiliferous; fusulinids and brachiopods4.65
Americus limestone member (12.15 feet)
10. Limestone, ashy gray; fusulinids0.6
9. Shale, gray; fusulinids0.15
8. Limestone, bluish-gray; crinoid fragments and brachiopods0.7
7. Shale, yellow, soft0.3
6. Limestone, gray, hard; fossil fragments0.3
5. Shale, dark bluish-gray, limy in basal part; abundant fossils especially Dictyoclostus5.9
4. Limestone, gray, platy; brachiopods2.0
3. Shale, black or dark-gray; brachiopods0.7
2. Limestone, dark-gray, crystalline, "deer track" impressions on upper surface; fusulinids and brachiopods1.5
Hamlin shale
Oaks shale member
1. Shale, dark to blackexposed
(14) SE SE sec. 6, T. 20 S., R. 9 E., Chase County, Kansas. Along Bloody Creek. Thickness,
Grenola limestone (20.35 feet exposed)
Salem Point shale member
34. Shale, gray, flakyexposed
Burr limestone member (7.75 feet)
33. Limestone or shale, yellow-gray, platy1.85
32. Shale, gray and yellow2.85
31. Limestone, brown and gray, platy; clams in lower 0.2 foot2.0
30. Shale, gray0.05
29. Limestone, bluish-gray, mottled; clams1.0
Legion shale member (9.5 feet)
28. Shale or shaly limestone, gray; abundant fossils especially brachiopods and bryozoans2.0
27. Limestone, gray, soft; fossils as in unit 281.0
26. Shale, mostly gray, some bluish and yellow, flaky6.5
Sallyards limestone member
25. Limestone or limy shale, gray, more shaly in middle part; abundant clams2.1
Roca shale (18.7 feet)
24. Shale, dark-gray0.25
23. Limestone, bluish-gray, impure, platy to shaly, locally massive, locally weathers as shale1.95
22. Covered interval5.1
21. Shale, greenish-gray, slightly nodular3.5
20. Clay, dark bluish-gray, blocky0.5
19. Shale or limestone, nodular, blocky0.5
18. Shale, red and green, red prevalent in upper middle part1.2
17. Limestone, gray, nodular, very uneven top; calcite cleavage faces on fractured surface; small high-spired snails0.4-1.0
16. Shale, gray0.1
15. Limestone, Portland cement gray, silty0.8
14. Shale, gray; contains limestone stringers0.5
13. Covered interval3.3
Red Eagle limestone (18.6 feet exposed)
Howe limestone member (2.7 feet)
12. Limestone, light-gray, banded, weathers light-gray, more or less crystalline, pitted; uneven upper surface; ostracodes and foraminifers1.0
11. Limestone, brownish-gray, "pepper and salt"; foraminifers0.5
10. Limestone, gray to yellowish, somewhat slabby, earthy, uneven contact with unit 111.2
Bennett shale member (14.9 feet)
9. Shale, gray, limy0.5
8. Shale, yellow and gray1.0
7. Limestone, yellowish-gray, earthy0.25
6. Shale, gray; abundant bryozoans, brachiopods, and echinoid spines4.25
5. Limestone, light-gray to nearly white; lower 0.7 foot shaly and slabby; fusulinids in lower 1.4 feet6.0
4. Shale, yellow, black in lower part, silty0.7
3. Limestone, brownish-gray, phosphatic; contains scales, teeth, abundant conodonts, and Orbiculoidea0.2
2. Shale, light-gray to dark in lower part, blocky2.0
Glenrock limestone member
1. Limestone, gray, blocky, jointedexposed
(15) NW SE sec. 24, T. 21 S., R. 9 E., Chase County, Kansas. In Atyeo oil field. Thickness,
Red Eagle limestone (17.75 feet)
Howe limestone member
21. Limestone, light-gray, weathers gray to slightly yellow, more or less earthy; mostly algae and small foraminifers1.5
Bennett shale member (15.5 feet)
20. Shale, yellow, clayey; Composita and Dictyoclostus1.55
19. Shale, drab, clayey5.8
18. Shale, gray and dark, more or less banded, darker gray toward base; abundant bryozoans, echinoid spines, sparse crinoid fragments, Chonetes, Neospirifer, Meekella, Wellerella, productids5.05
17. Limestone, medium- to dark-gray, massive; white fossil fragments1.35
16. Shale, dark-gray, nearly black, upper 0.7 foot harder than remainder, lower part fissile; Crurithyris and Orbiculoidea1.75
Glenrock, limestone member
15. Limestone, gray, dense, impure, lithographic; part massive and brecciated-appearing; laminated; lower part slabby0.75
Johnson shale (18.15 feet)
14. Limestone, sandy, and thin beds of shale; brown, limonitic0.6
grades into
13. Shale, brown, clayey and carbonaceous, wavy-bedded0.4
12. Shale, grayish-blue to dark-gray in lower part, nodular, noncalcareous0.75
11. Shale, light-gray, orange-pink zones in lower part, calcareous, stands out on outcrop as two lawyers with softer lower middle part1.1
10. Shale, upper part green, lower gray, four light and dark bands3.7
9. Limestone and shale, mostly limy shale; locally 0.6 foot of limestone stands out on weathered outcrop; locally algal (?) material weathered into "boxwork"1.2-5.0
8. Limestone, light-gray, weathers to lighter gray, impure, nodular, locally only a light band in shale0.3-0.6
7. Shale, light- and dark-gray bands, lower half is bluish-gray; contains lenses of satin spar gypsum in middle part and sparse gypsum in upper part6.0
Foraker limestone (13.25 feet exposed)
Long Creek limestone member (11.45 feet)
6. Clay and gypsum, nearly solid celestite in lower part; nearly pure gypsum in upper part0.6
5. Shale, yellow and gray1.1
4. Limestone, light-gray; upper part slabby, earthy to granular; part laminated; lower part weathers as nearly white shale; many vugs of barite and pyrite, veins of chalcopyrite5.15
3. Limestone, light-gray to yellow, platy; contains nodules of pyrite1.25
2. Limestone, light- to medium-gray, lower part darker and mottled, middle part suboolitic3.35
Hughes Creek shale member
1. Shale, dark to nearly black, limy, hard; sparse fusulinids in upper part; lower part packed with fusulinids; lacy bryozoans, crinoid fragments, Chonetes, and Compositaexposed
(16) Near Cen. N2 sec. 33, T. 23 S., R. 10 E., Greenwood County, Kansas. In Thrall oil field, near Thrall post office. Thickness,
Roca shale
10. Shale  
Red Eagle limestone (15.7 feet)
Howe limestone member
9. Limestone, gray; profuse tiny low and high-spired gastropods, tiny clams, ostracodes in upper part; lower part light-gray with some tan, sandy appearing, massive; sparse poorly preserved microfossils1.1
Bennett shale member (14.1 feet)
8. Shale, yellow to buff, calcareous or dolomitic0.6
7. Shale, mottled olive-gray and tan, thin-bedded to blocky; sparse bryozoans and echinoid fragments9.6
6. Limestone, light-gray, beds 0.5 foot thick and less; fusulinids, echinoderm fragments, and brachiopods2.7
5. Shale, gray, weathers tan, thin-bedded; sparse fragments of Orbiculoidea1.2
Glenrock limestone member
4. Limestone, medium-gray, weathers tan to buff, uneven upper and lower surfaces, chiefly algal material; algal colonies weather free at top; fusulinids, ostracodes; Orbicuioidea. in top crust of bed0.4-0.5
Johnson shale (3.5 feet exposed)
3. Shale, gray to tan, thin-bedded, soft; contains limy nodules 2.0 2. Limestone gray, weathers tan, platy, silty0.2
1. Shale light tannish-gray, nodular to thin-bedded and platyexposed
(17) SW NW sec. 11, T. 26 S., R. 8 E., Greenwood County, Kansas. In Sallyards oil field. Thickness,
Grenola limestone
Sallyards limestone member Roca shale
8. Shale, not studied in detail, measured along highway one-half mile east10.9
Red Eagle limestone (11.4 feet)
Howe limestone member
7. Limestone, light-gray, banded; spergenite of abundant algal material, small snails, ostracodes, echinoid spines; sparse Composita and Aviculopecten-like clams0.8-1.0
Bennett shale member (9.3 feet)
6. Limestone, yellow-brown, silty0.3-1.4
5. Shale, gray, weathers tan, calcareous2.0
4. Shale, light-gray, some shaly and silty limestone in middle part; stony bryozoans, echinoid fragments, corals, Chonetes, and Composita5.9
Glenrock limestone member
3. Limestone, light-gray, hard, massive; large and small fusulinids, echinoderm fragments, bryozoans, Hustedia, Ambocoelia, and Wellerella1.0-1.1
Johnson shale (3.5 feet exposed)
2. Shale, dark olive-gray to tan, blocky0.5
1. Shale, gray and brown mottled; contains small soft limy nodules; thin-bedded to blockyexposed
(18) NE SW sec. 30, T. 27 S., R. 9 E., Greenwood County, Kansas. About 1 mile north and 5 miles east of Beaumont. Thickness,
Red Eagle limestone (11.5 feet exposed)
Bennett shale member (8.7 feet exposed)
5. Limestone, light- to brownish-gray, hard, massive, brecciated in middle part; contains sparse gray chert; brachiopods, crinoid fragments; abundant fusulinids in lower and upper partsexposed
4. Limestone, gray; red-brown fragments of Orbiculoidea, sparse echinoderm and brachiopod fragments, and abundant fusulinids0.6
3. Shale, gray to brown; sparse Orbiculoidea0.1
Glenrock limestone member
2. Limestone, light-gray, weathers light-gray to light yellowish-tan, locally massive, locally slabby, cherty; abundant fusulinids, sparse echinoderm and brachiopod fragments2.8
Johnson shale
1. Shale, largely covered to a cherty zone in Foraker limestone11.4
(19) W2 sec. 3, T. 31 S., R. 8 E., Cowley and Elk Counties, Kansas. In creek bank and Santa Fe Railway cut. Measured by George J. Verville. Thickness,
Grenola limestone
Sallyards limestone member
6. Limestone, dark-gray, platy to irregular-bedded, coarsely crystalline; pelecypods common4.0
Roca shale
5. Shale, red, green at top and base; contains numerous knoblike algal growths in upper part14.7
Red Eagle limestone (19.6 feet)
Howe limestone member
4. Limestone, buff, chalky, sugary texture, massive, many small foraminifers and gastropods2.5
Bennett shale member (16.9 feet)
3. Limestone, gray, weathers gray to buff, coarsely crystalline; massive to thin irregular beds; lower part somewhat nodular; jointed16.6
2. Shale, gray, silty to mealy; contains red-brown fragments of Orbiculoidea0.3
Glenrock limestone member
1. Limestone, gray, silty, nodular; fusulinids0.2
(20) Sec. 21, T. 32 S., R. 8 E., Cowley County, Kansas. Cut on Kansas highway 38. Thickness,
Red Eagle limestone (20.7 feet exposed)
Howe limestone member
27. Limestone, speckled gray, tan, and brown; spergenite of shell fragments, ostracodes, bryozoans, gastropods, echinoid fragments, fusulinidsexposed
Bennett shale member (17.4 feet)
26. Limestone, tannish-gray, uniformly fine-grained6.4
25. Limestone, light- to medium-gray, dark-brown fossil molds, massive, hard, part brecciated; sparse bryozoans, fusulinids, ostracodes, foraminifers, abundant brachiopods and echinoderm fragments5.1
24. Shale, gray0.1
23. Limestone, gray, hard, fine to medium crystalline; sparse bryozoans, abundant brachiopod and echinoderm fragments3.8
22. Shale, tan to gray0.2
21. Limestone, medium-gray; brachiopods1.0
20. Limestone, medium-gray, hard, crystalline0.6
19. Shale, gray to nearly black, very thin-bedded; small fusulinids and red-brown fragments of Orbiculoidea0.2
Glenrock limestone member
18. Limestone, grades laterally into limestone nodules interbedded with shale; contains a few glauconite grains; sparse echinoderm fragments, very small fusulinids, ostracodes, gastropods, foraminifers, and brachiopods0.5
Johnson shale (30.3 feet)
17. Shale, light-gray and tan, underclaylike0.4
16. Shale, gray, thin-bedded; nodular to limy siltstone interbedded with tannish-gray to dark-gray thin-bedded shale; upper part contains bryozoans, crinoid fragments, Nucula and other clams, sparse snails, Ambocoelia, Chonetes, abundant Linoproductus and Juresania, and abundant ostracodes4.6
15. Siltstone, light-gray, weathers creamy gray0.1
14. Conglomerate, shale and limestone pebbles0.3
13. Shale, olive and tan; contains carbonized plant fragmentsaverages
12. Limestone, "boxwork," yellow-brown and greenish, grading laterally into gray siltstone0.4-1.0
11. Shale, olive and tan, upper part blocky with small white limy nodules, lower part thin-bedded3.6
grades into
10. Shale, olive and tan4.5
9. Shale, maroon in upper part, green in lower, blocky2.9
8. Mudstone, greenish-gray, weathers into small nodules1.1
7. Limestone, pinkish-gray, hard, dense, sublithographic; contains small veins of clear calcite and green clay; tiny snails0.7
6. Shale, gray to olive, dark-green in lower part, blocky2.7
5. Limestone, gray to light-tan, weathers deep golden-brown; tiny snails and clams1.2
4. Siltstone, light-gray to light-cream, limy, and light-gray limy shale; Nucula, and other clams, and snails1.4
3. Siltstone, gray to tan, weathers cream to tan2.2
2. Shale, yellowish-brown to gray, upper part clayey; contains abundant limy nodules in lower part3.4
Foraker limestone
Long Creek limestone member
1. Limestone, light- to medium-gray, weathers yellowish-brown, fine-grained, massive, hard, fossiliferous; contains sparse gray to black chert nodulesexposed

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Kansas Geological Survey, Geology
Placed on web July 14, 2006; originally published Dec. 31, 1952.
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