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Stratigraphic Sections
Each stratigraphic unit shown on Plate 2 is represented here by at least one measured section description. All descriptions pertain to Franklin County exposures with the exception of A9 and A10, which were measured and described in Anderson County.
A sections || B sections || C sections || D sections
D1--Composite section of road cut exposures at the SE cor. sec. 13, T. 19 S., R. 17 E. (Plattsmouth Limestone to Snyderville Shale), and near the cen. S line sec. 18, T. 19 S., R. 18 E. (Toronto Limestone). | Thickness (feet) |
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Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray on fresh surfaces, weathers buff, thin and irregularly bedded, microcrystalline; crinoid columnals, Composita, Enteletes, Hustedia, Neospirifer; thickness exposed | 5.0 | ||
Heebner Shale Member | |||
Shale, tan, weathers flaky, calcareous; brachiopods | 3.0 | ||
Shale, black, platy; conodonts | 1.2 | ||
Total thickness of Heebner Shale | 4.2 | ||
Leavenworth Limestone Member | |||
Limestone, gray blue, a single bed devoid of partings, extremely dense, fractures conchoidally; brachiopods, tiny spired gastropods, Aviculopecten, fusulinids | 1.3 | ||
Snyderville Shale Member | |||
Covered interval | 12.0 | ||
Toronto Limestone Member | |||
Limestone, brown, ferruginous, thin to thick and relatively even bedded, fine grained, compact; brachiopods, crinoids, abundant fusulinids | 11.0 |
D2--Section measured in road ditch along cen. part E line sec. 31, T. 18 S., R. 18 E. | Thickness (feet) |
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---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, brown to gray upward on fresh surfaces, weathers tan, thin and wavy bedded, compact; Chonetes, Derbyia, Lophophyllidium, Neospirifer, massive bryozoans; exposed thickness about | 6.0 | ||
Heebner Shale Member | |||
Shale, dark gray to black, platy, clayey to slightly silty; about | 4.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray, single thick bed, extremely dense; brachiopods, clams, crinoids, fusulinids | 1.5 | ||
Limestone, gray, bedding indistinct, weathers shaly; Osagia-coated shell fragments, sparse ooliths, and limestone granules in a slightly silty limestone matrix; about | 0.5 | ||
Total thickness of Leavenworth Limestone | 2.0 | ||
Snyderville Shale Member | |||
Shale, olive to gray, bedding indistinct, weathers to irregular blocks in lower pant and to flakes in upper part, calcareous nodules in lowermost 2 to 3 feet; no megafossils observed | 9.0 | ||
Toronto Limestone Member | |||
Limestone, gray blue to brown on fresh surfaces, weathers brown, thin to thick relatively even beds weather to a rubble in uppermost and lowermost parts of member, microcrystalline, earthy in uppermost foot; Chonetes, Composita, Derbyia, Neospirifer, Punctospirifer, Syringopora, corals, dictyoclostids, abundant fusulinids, ramose bryozoans | 11.0 | ||
Lawrence Shale | |||
Shale, gray green, bedding poor, very clayey and plastic, low silt content; seemingly barren of megafossils | 2.0 | ||
Shale and siltstone, tan, cross stratified; about | 15.0 | ||
Coal smut | 0.2 | ||
Shale, green to tan, weathers into irregular blocks, clayey to silty; no megafossils observed; thickness exposed about | 35.0 |
D3--Section of road cut exposures along the W line NW 1/4 sec. 30, T. 18 S., R. 18 E. | Thickness (feet) |
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---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray on both fresh and weathered surfaces, thin and wavy bedded, microcrystalline matrix contains randomly oriented coarsely crystalline calcite veinlets; Composita, Hustedia, Neospirifer, lophophyllid corals; thickness exposed | 5.0 | ||
Heebner Shale Member | |||
Covered interval | 5.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray, single thick vertically jointed bed, extremely dense, fractures conchoidally; brachiopods, clams, crinoids, fusulinids | 1.0 | ||
Snyderville Shale Member | |||
Covered interval; about | 21.0 | ||
Toronto Limestone Member | |||
Limestone, brown on both fresh and weathered surfaces, thin to thick and relatively even bedded, fine grained, compact; brachiopods, crinoids, fusulinids; about | 12.0 |
D4--Section of road cut exposures in the SW 1/4 NW 1/4sec. 18, T. 18 S., R. 18 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray on both fresh and weathered surfaces, thin and wavy bedded, microcrystalline matrix contains abundant coarsely crystalline calcite; Composita, Derbyia, Hustedia, Neospirifer, Rhipidomella, marginiferids, crinoid stems, lophophyllid corals; thickness exposed | 22.0 | ||
Heebner Shale Member | |||
Claystone, tan, structureless | 1.5 | ||
Claystone, drab, weathers into irregular blocks | 2.0 | ||
Shale, black, platy bedding; conodonts | 8.0 | ||
Total thickness of Heebner Shale | 11.5 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray, single thick vertically jointed bed, extremely dense, fractures conchoidally; brachiopods, crinoids, echinoid spines, sparse fusulinids | 1.0 | ||
Snyderville Shale Member | |||
Covered interval | 6.5 | ||
Limestone, white, nodular, impure; no megafossils observed | 0.5 | ||
Shale, gray, paper-thin strata weather to irregular flakes | 3.0 | ||
Claystone, ochre, structureless | 0.4 | ||
Claystone, drab, weathers into irregular blocks | 1.5 | ||
Claystone, ochre; contains minute calcareous nodules | 2.5 | ||
Shale, light gray, weathers into flakes; about | 4.5 | ||
Total thickness of Snyderville Shale | 18.9 | ||
Toronto Limestone Member | |||
Limestone, brown; brachiopods, crinoids; only the top exposed. |
D5--Section of a road cut exposure near the cen. W line sec. 4, T. 18 S., R. 18 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray to white on both fresh and weathered surfaces, thin and irregularly bedded, abundant coarsely crystalline calcite in a fine-grained matrix; Composita, Ottonosia, crinoid remains; exposed thickness | 8.0 | ||
Heebner Shale Member | |||
Covered interval | 4.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray on fresh surfaces, weathers buff, single vertically jointed thick bed, extremely dense; brachiopods, clams, fusulinids | 2.0 | ||
Snyderville Shale Member | |||
Shale, drab, clayey; nodular "boxwork" limestone float whose position within the member was not determined exactly; mostly covered; about | 23.0 | ||
Toronto Limestone Member | |||
Limestone, upper 2 feet gray, remainder brown on both fresh and weathered surfaces, microcrystalline; Chonetes, dictyoclostids, abundant crinoid stems, abundant fusulinids; about | 11.0 |
D6--Section of a road cut exposure at the SW cor. sec. 25, T. 17 S., R. 17 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray to white on fresh surfaces, weathers buff, thin and wavy bedded, microcrystalline matrix contains abundant coarsely crystalline calcite; brachiopods, crinoids, corals; exposed thickness | 6.0 | ||
Heebner Shale Member | |||
Covered interval | 5.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray on fresh surfaces, weathers buff, single thick vertically jointed bed, extremely dense, fractures conchoidally; brachiopods, small spired gastropods, sparse fusulinids | 1.2 | ||
Snyderville Shale Member | |||
Covered interval | 2.0 | ||
Siltstone, gray to tan, platy, calcareous; seemingly barren of megafossils | 1.0 | ||
Claystone, gray green to yellow tan upward, bedding poor, highly weathered, earthy, silty; contains irregular minute calcareous nodules | 17.0 | ||
Total thickness of Snyderville Shale | 20.0 | ||
Toronto Limestone Member | |||
Limestone, yellow to tan on both fresh and weathered surfaces, platy, silty; abundant small clams such as Pleurophorus and Nucula | 2.0 | ||
Limestone, gray, dense, silty; Lingula, ostracodes, clams | 1.0 | ||
Siltstone, gray on fresh surfaces, weathers tan, finely laminated, calcareous; seemingly barren of megafossils | 1.0 | ||
Limestone, gray on both fresh and weathered surfaces, thin to thick and relatively even bedded, fine grained, compact, slightly silty; sparse chert nodules in upper part; abundantly fossiliferous, Aviculopinna, Chonetes, Composita, Derbyia, Hustedia, Lophophyllidium, Meekella, Myalina, Neospirifer, Punctospirifer, Ottonosia, dictyoclostids, marginiferids, pectenoid clams, fenestrate and ramose bryozoans, crinoid fragments, echinoid spines, tiny spired gastropods; about | 11.0 | ||
Total thickness of Toronto Limestone | 15.0 | ||
Lawrence Shale |
D7--Section of road cut exposure near the cen. SW 1/4 sec. 23, T. 17 S., R. 17 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, white on both fresh and weathered surfaces, thin and wavy bedded, microcrystalline matrix contains abundant coarsely crystalline calcite; sparse chert nodules; brachiopods, bryozoans, crinoids, corals, fusulinids; thickness exposed | 9.0 | ||
Heebner Shale Member | |||
Covered interval | 1.3 | ||
Shale, black, fissile; conodonts | 2.5 | ||
Total thickness of Heebner Shale | 3.8 | ||
Leavenworth Limestone Member | |||
Limestone, medium gray, single vertically jointed bed, extremely dense; brachiopods, fusulinids | 1.5 | ||
Snyderville Shale Member | |||
Shale, tan to gray, clayey; poorly exposed | 5.0 | ||
Claystone, gray to yellow tan, massive in upper part, silty and shaly in lower part; contains small calcareous nodules; about | 8.5 | ||
Shale, gray, paper-thin bedding | 1.0 | ||
Limestone, yellow, earthy, gray blebs of dense limestone in upper part | 0.5 | ||
Shale, light gray, papery bedding, calcareous | 5.0 | ||
Limestone, light to medium gray, laminated as though it might be algal, dense | 0.5 | ||
Siltstone, yellow to light gray, weathers to a "boxwork" surface, calcareous | 2.5 | ||
Limestone, light gray to tan, a single dense bed; sparse snails and pectenoid clams | 0.5 | ||
Shale, yellow to tan, thin hand siltstone beds in upper 3 feet; mostly covered | 4.0 | ||
Total thickness of Snyderville Shale | 27.5 | ||
Toronto Limestone Member | |||
Siltstone, medium gray, platy, calcareous, dense; sparse clams, abundant ostracodes; about | 2.0 | ||
Limestone, medium gray, thick and even bedded, fine grained, compact, brittle; sparse brachiopods and ostracodes | 2.0 | ||
Covered interval, mostly limestone | 7.0 | ||
Limestone, gray to brown on fresh surfaces, weathers gray, thick and relatively even bedded, dense, basal surface very uneven; Enteletes, crinoid fragments | 2.0 | ||
Total thickness of Toronto Limestone | 13.0 | ||
Lawrence Shale | |||
Shale, gray to tan, weathers into flakes, clayey | 0.5 | ||
Coal | 2.0 | ||
Shale, gray to tan, weathers to irregular blocks | 2.0 | ||
Limestone, gray to gray brown, sublaminated as in some algal beds; veinlets of green clayey material in the upper part | 1.0 | ||
Shale, tan to gray; poorly exposed | 1.0 |
D8--Section of a road cut exposure near the cen. E line sec. 18, T. 17 S., R. 18 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray to white on both fresh and weathered surfaces, thin and irregularly bedded, microcrystalline matrix contains abundant coarsely crystalline calcite; brachiopods, crinoids; thickness exposed | 5.0 | ||
Heebner Shale Member | |||
Covered interval | 4.0 | ||
Leavenworth Limestone Member | |||
Limestone, gray blue on fresh surfaces, weathers buff, single thick vertically jointed bed, extremely dense; brachiopods, clams, sparse fusulinids | 1.3 | ||
Snyderville Shale Member | |||
Covered interval; about | 13.0 | ||
Toronto Limestone Member | |||
Limestone, yellow, thin and even bedded, silty, surface weathers to irregular large nondescript forms which may be fucoids; Aviculopecten, ostracodes, fenestrate bryozoans | 1.5 | ||
Shale parting, silty | 0.2 | ||
Limestone, light gray on fresh surfaces, weathers tan, granular; Juresania | 1.0 | ||
Limestone, tan to brown, thin bedded; sparse fossil fragments | 3.5 | ||
Limestone, gray to tan on fresh surfaces, weathers brown, thin to thick and relatively even bedded, microcrystalline; dictyoclostids, crinoid fragments | 7.0 | ||
Total thickness of Toronto Limestone | 13.2 | ||
Lawrence Shale | |||
Shale, gray green, papery bedding, clayey | 1.0 | ||
Coal smut, poorly developed | 0.1 | ||
Shale, gray to tan, silty to sandy; contains sandstone stringers | 9.0 | ||
Coal | 0.3 | ||
Claystone, tan | 0.4 | ||
Shale, tan, silty to sandy, interbedded with thin sandstone beds; about | 17.0 | ||
Ireland Sandstone Member | |||
Sandstone and sandy to silty shale, tan, sandstone thin to thick bedded and massive, shale bedding poor; thickness exposed | 35.0 |
D9--Section of a road cut exposure at the SW cor. sec. 35, 1. 16 S., R. 17 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Leavenworth Limestone Member | |||
Limestone, blue gray on fresh surfaces, weathers tan, single thick bed, extremely dense; brachiopods, crinoid fragments; thickness exposed | 1.0 | ||
Snyderville Shale Member | |||
Shale, gray green, finely laminated, clayey to silty | 7.0 | ||
Toronto Limestone Member | |||
Limestone, brown on both fresh and weathered surfaces, thin to thick and even bedded, fine grained, compact; sparse chert nodules in upper part; brachiopods, crinoids; about | 11.0 |
D10--Composite section of road cut exposures near the cen. S line sec. 19, T. 16 S., R. 18 E. (Leavenworth Limestone to Plattsmouth Limestone) and near the SW cor. SE 1/4 sec. 19, T. 16 S., R. 18 E. (Lawrence Shale to Toronto Limestone). (Fault exists between the two parts of this section.) | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray on fresh surfaces, weathers tan, thin to thick and irregularly bedded, microcrystalline matrix contains abundant crystalline calcite; brachiopods, crinoids; thickness exposed | 8.0 | ||
Heebner Shale Member | |||
Covered interval; about | 10.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray on fresh surfaces, weathers tan, single vertically jointed bed, extremely dense; brachiopods, crinoids, clams, corals, echinoids, sparse fusulinids | 1.2 | ||
(Snyderville Shale Member is not exposed in either section; average thickness of the Snyderville in nearby exposures is about 11 feet.) | |||
Toronto Limestone Member | |||
Limestone, brown on both fresh and weathered surfaces, thin to thick and relatively even bedded; Chonetes, Derbyia, Meekella, crinoid columnals and calyx plates, abundant fusulinids | 8.0 | ||
Lawrence Shale | |||
Shale, siltstone, and sandstone interbedded, gray green to tan, silty to clayey upward | 13.0 | ||
Shale, gray green to tan, platy, silty; no megafossils observed; thickness exposed | 20.0 |
D11--Composite section of road cut exposures along the E line SE 1/4 SE 1/4 sec. 7, T. 16 S., R. 18 E. (upper part of the Plattsmouth Limestone to the Kereford Limestone) and near the cen. E line sec. 7, T. 16 S., R. 18 E. (lower part of the Plattsmouth Limestone to the Snyderville Shale). | Thickness (feet) |
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---|---|---|---|
Oread Limestone | |||
Kereford Limestone Member | |||
Limestone, mottled in shades of gray and tan on both fresh and weathered surfaces, weathers into irregular plates, slightly silty; Beecheria, Composita, bryozoans, crinoids, abundant fusulinids; exposed | 3.0 | ||
Shale, tan, calcareous; brachiopods, bryozoans, crinoids | 3.0 | ||
Heumader Shale Member | |||
Shale, light gray, silty to clayey; limonite concretions; lower part covered; about | 26.0 | ||
Plattsmouth Limestone Member | |||
Limestone, light gray to tan on both fresh and weathered surfaces, thin and irregularly bedded, microcrystalline matrix contains abundant coarsely crystalline calcite; Composita, bryozoans, crinoids; about | 20.0 | ||
Heebner Shale Member | |||
Shale tan to gray, paper-thin strata weather into irregular flakes, silty to clayey; brachiopods; about | 3.0 | ||
Shale, dark gray to black, platy to nearly fissile; conodonts; about | 6.0 | ||
Total thickness of Heebner Shale | 9.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray on both fresh and weathered surfaces, a single vertically jointed dense bed; Chonetes, Marginifera, Punctospirifer, sparse fusulinids | 1.5 | ||
Snyderville Shale Member | |||
Shale, gray, silty, calcareous | 1.3 | ||
Limestone, gray, fine grained, compact, lensing and nodular; fossiliferous | 0.5 | ||
Shale, gray to tan, silty; thickness exposed | 5.0 |
D12--Section of a road cut exposure at the SE cor. sec. 6, T. 16 S., R. 18 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray to white on both fresh and weathered surfaces, thin and irregularly bedded, weathers to a rubble, fine grained. compact; abundant crystalline calcite; sparse fossiliferous chert nodules; Chonetes, Derbyia, Hustedia, massive bryozoans, abundant crinoid fragments, corals; thickness exposed | 10.0 | ||
Heebner Shale Member | |||
Shale, tan, weathers into irregular flakes, clayey | 4.0 | ||
Shale, black, platy; conodonts | 7.0 | ||
Total thickness of Heebner Shale | 11.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray on fresh surfaces, weathers tan, single vertically jointed bed; Ottonosia, marginiferids, crinoids, minute clams, fusulinids, tiny spired gastropods | 1.4 | ||
Lawrence-Snyderville Shale | |||
Shale, gray to green to yellow brown upward, weathers flaky, clayey to silty | 1.0 | ||
Limestone, brown mottled with blue on fresh surfaces, weathers brown, nodular; abundant Chonetes, Juresania, Ottonosia, crinoids, sparse fusulinids | 0.6 | ||
Shale, tan, silty to clayey | 0.1 | ||
Limestone, gray on fresh surfaces, weathers tan, nodular, silty; productids, crinoids | 0.3 | ||
Shale, tan to gray green, silty, zone of septarian concretions about 7 feet below top, zone of ironstone nodules about 15 feet below top; no megafossils observed; thickness exposed about | 35.0 |
D13--Section of a road cut exposure in the SW 1/4 SE 1/4 sec. 31, T. 15 S., R. 18 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray to white on fresh surfaces, weathers tan, thin and irregularly bedded, microcrystalline; brachiopods, crinoids, corals; thickness exposed | 10.0 | ||
Shale, tan, paper-thin strata weather into irregular flakes, clayey | 2.0 | ||
Shale, black, fissile, weathers into flakes and plates | 4.5 | ||
Total thickness of Heebner Shale | 6.5 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray on fresh surfaces, weathers tan, extremely dense, fractures conchoidally, a single thick bed, vertically jointed; brachiopods, crinoids, sparse fusulinids | 1.7 | ||
Lawrence-Snyderville Shale | |||
Limestone, brown, silty; crinoids, ramose bryozoans; contacts gradational; thickens to cast in road cut | 0.5-0.7 | ||
Limestone, gray, nodular, silty; Myalina | 0.7 | ||
Coal | 0.2 | ||
Shale, gray, clayey to silty | 1.5 | ||
Shale, gray green to brown, flaky, silty; thickness exposed | 31.0 |
D14--Section of a road cut exposure near the cen. W line sec. 32, T. 15 S., R. 18 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray to white on both fresh and weathered surfaces, thin and wavy bedded, microcrystalline; brachiopods, crinoids, corals, sparse fusulinids; thickness exposed | 10.0 | ||
Heebner Shale Member | |||
Shale, gray to brown, flaky, clayey to silty | 3.0 | ||
Shale, gray, brown, and black shale interbedded; phosphatic nodules; about | 15.0 | ||
Total thickness of Heebner Shale | 18.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray on fresh surfaces, weathers tan, single thick vertically jointed bed; brachiopods, clams; poorly exposed, only on east side of road | 1.0 | ||
Snyderville Shale Member | |||
Shale, gray to tan, bedding indistinct, irregular clay blobs dot surface; about | 15.0 | ||
Toronto Limestone Member | |||
Limestone, gray to brown upward on both fresh and weathered surfaces, thin to thick and relatively even bedded, microcrystalline; brachiopods, crinoids, fusulinids; dipping north, thickness exposed in ditch west of the road about | 3.0 | ||
Lawrence Shale | |||
Shale, siltstone, and sandstone; thickness exposed | 7.0 |
D15--Section of a road cut exposure near the SW cor. sec. 29, T. 15 S., R. 18 E. (Leavenworth Limestone and Snyderville Shale are not present in this exposure, but crop out within ~4 mile in all directions.) | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, gray to white on both fresh and weathered surfaces, thin and wavy bedded, microcrystalline; brachiopods, corals, crinoids; thickness exposed | 5.0 | ||
Heebner Shale Member | |||
Shale, gray brown, flaky, clayey to silty | 2.0 | ||
Shale, black, weathers into irregular blocks | 2.0 | ||
Total thickness of Heebner Shale | 4.0 | ||
Toronto Limestone Member | |||
Limestone, yellow brown on both fresh and weathered surfaces, thin to thick and relatively even bedded; dictyoclostids, marginiferids, abundant crinoid fragments, ramose bryozoans, echinoid spines and plates, abundant slender fusulinids | 9.0 | ||
Limestone, gray to white on fresh surfaces, weathers tan, bedding indistinct, floe grained, compact; brachiopods, crinoids, sparse fusulinids | 4.0 | ||
Total thickness of Toronto Limestone | 13.0 | ||
Lawrence Shale | |||
Shale, gray green to brown upward, flaky, clayey to silty | 13.0 | ||
Shale, red, weathers into irregular blocks, silty | 2.0 | ||
Shale, gray green, weathers into flakes and irregular blocks; poorly exposed; about | 10.0 |
D16--Section of a road cut exposure near the cen. E line sec. 30, T. 15 S., R. 18 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, tan to gray on both fresh and weathered surfaces, thin and irregularly bedded; abundant brachiopods, crinoid fragments; thickness exposed | 6.0 | ||
Heebner Shale Member | |||
Shale, tan and silty in upper part, remainder covered | 6.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray on both fresh and weathered surfaces, single vertically jointed extremely dense bed; brachiopods, tiny spired gastropods | 1.5 | ||
Snyderville Shale Member | |||
Covered interval | 3.0 | ||
Toronto Limestone Member | |||
Limestone, brown on both fresh and weathered surfaces, thick bedded, microcrystalline; brachiopods, crinoids, bryozoans, fusulinids; thickness exposed | 2.0 |
D17--Section of a road cut exposure near the cen. N line sec. 30, T. 15 S., R. 18 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Plattsmouth Limestone Member | |||
Limestone, tan to gray, thin and wavy bedded, microcrystalline matrix contains abundant coarsely crystalline calcite; productids, Enteletes, crinoid fragments; thickness exposed | 5.0 | ||
Heebner Shale Member | |||
Shale, tan, weathers into irregular flakes, clayey to silty | 2.0 | ||
Shale, black, fissile to platy | 3.0 | ||
Total thickness of Heebner Shale | 5.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray on both fresh and weathered surfaces, single vertically jointed extremely dense bed; brachiopods, crinoids, tiny spired gastropods, sparse fusulinids | 1.5 | ||
Snyderville Shale Member | |||
Covered interval | 8.5 | ||
Toronto Limestone Member | |||
Limestone, brown on both fresh and weathered surfaces, thin to thick and relatively even bedded; brachiopods, crinoids; thickness exposed | 5.0 |
D18--Section in abandoned quarry near the cen. NE 1/4 sec. 24, T. 15 S., R. 17 E. | Thickness (feet) |
||
---|---|---|---|
Oread Limestone | |||
Kereford Limestone Member | |||
Limestone, tan, weathered to rubble; Dielasma, Composita, Neospirifer; thickness exposed | 1.0 | ||
Heumader Shale Member | |||
Shale, tan, calcareous, flaky; brachiopod and crinoid fragments | 1.0 | ||
Shale, blue gray, clayey, weathers into irregular blocks | 11.5 | ||
Total thickness of Heumader Shale | 12.5 | ||
Plattsmouth Limestone Member | |||
Limestone, light gray, thin and wavy bedded, microcrystalline matrix; abundant coarsely crystalline calcite; productids, crinoids, sparse fusulinids | 18.0 | ||
Heebner Shale Member | |||
Covered interval | 7.0 | ||
Leavenworth Limestone Member | |||
Limestone, blue gray, extremely dense; brachiopods, sparse fusulinids | 1.2 | ||
Snyderville Shale Member | |||
Shale, gray, clayey to silty, flaky; thickness exposed | 1.0 |
A sections || B sections || C sections || D sections
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Kansas Geological Survey, Geology of Franklin County
Web version July 2002. Original publication date Jun. 1963.
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