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Smoky Hill Chalk Member, Niobrara Chalk

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Plates

Plate 1--Stratigraphic section of Niobrara Chalk, Smoky Hill River area, western Kansas

Explanation of Plate 2

Inoceramids of the Smoky Hill Member

1-4, Inoceramus (Volviceramus) grandis (Conrad). 1, Exterior view of upper valve of juvenile, X 1, KU 153992, upper part of section at Locality 1. Note encrustation by Pseudoperna congesta (Conrad) and circular sponge borings (lower left). 2, Exterior view of upper valve, X 1, KU153994, upper part of section at Locality 12. Note heavy encrustation by Pseudoperna congesta (Conrad). 3, Interior view of upper valve, X 0.70, KU153990, lower part of Smoky Hill Member at Locality 1. 4, Interior view of upper valve, X 0.5, KU154027, middle part of section at Locality 17.

5,6, Inoceramus (Cladoceramus) undulatoplicatus Roemer. 5, Internal mold of left valve, X 1.25, KU 153998, upper part of section at Locality 13. 6, Internal mold, right valve of juvenile specimen, X 1.5, KU154008. Note mold of Endocostea-like feature.

black and white photos, plate 2

Explanation of Plate 3

Inoceramids of the Smoky Hill Member

1, Inoceramus (Volviceramus) grandis (Conrad). External view of upper valve and outer rim (at right) of lower valve of articulated specimen, X 1, KU153991, lower part of Smoky Hill Member at Locality 1.

2, Inoceramus (Cladoceramus) undulatoplicatus Roemer. External view of fragment of valve margin, X 0.5, KU153996, middle part of section at Locality 19.

black and white photos, plate 3

Explanation of Plate 4

Inoceramids of the Smoky Hill Member

1-5, Inoceramus (Endocostea) balticus Bohm, 1, Internal mold of left valve, with bits of shell attached (lower left), X 1, KU 154004, middle part of Smoky Hill Member in section exposed in Sec. 25, T. 14 S., R. 33 W., Logan County, Kansas. 2, Interior view of left valve, X 1, KU154003, middle part of section at Locality 21. 3, Internal mold of right valve, X 2/3, KU154007, middle part of section at Locality 25.4, Internal mold of right valve, coarsely ribbed specimen, X 1, KU154006, middle part of section at Locality 25. 5, Internal mold of left valve, with portion of valve preserved at periphery, X 1, KU154005, middle part of Smoky Hill Member in section exposed in Sec. 25, T. 14 S., R. 33 W., Logan County, Kansas.

6, Inoceramus (Volviceramus) grandis (Conrad). Interior view of articulated specimen, X 1/3, KU153993, float from slope beneath bed equivalent to unit 12-15, 0.8 km (0.5 mile) south of Locality 12. Neither valve is complete. Note encrustation of external surfaces by Pseudoperna congesta (Conrad) all around periphery of specimen.

black and white photos, plate 4

Explanation of Plate 5

Bivalves of the Smoky Hill Member

1, Inoceramus stantoni Sokolow? Internal mold of right valve, with portion of valve preserved along posterior margin, X 1.5, KU154002, middle part of section at Locality 13.

2, Interior view of valve, unidentified species of pectinid, X 3, KU153997, middle part of section at Locality 21.

3, Lucina sp. A. Compressed mold, X 3, KU154018, upper part of section at Locality 13.

4, Inoceramus sp. Fragmentary shell and internal mold of right valve, X 1.5, KU154009, middle part of Smoky Hill Member in section exposed in Sec. 25, T. 14 S., R. 33 W., Logan County, Kansas.

5, Inoceramus (Platyceramus) platinus Logan. Right valve (not coated) of nearly perfect specimen from Sternberg Museum, Fort Hays Kansas State University, approximately X 0.25, FHKSU2086. Specimen collected by G. F. Sternberg.

black and white photos, plate 5

Explanation of Plate 6

Bivalves of the Smoky Hill Member

1-9, Pseudoperna congesta (Conrad). 1, Interior view of right valve, X 2, KU154012, near middle of section at Locality 18. 2, Interior view of right valve, X 1, KU154026, float from middle part of member in section exposed in Sec. 25, T. 14 S., R. 33 W., Logan County, Kansas. 3, Righthand view of articulated specimen, X 1, KU154013, from middle part of member in section exposed in Sec. 15, T. 14 S., R. 26 W., Gove County, Kansas. Specimen was attached to a small shell fragment and developed elongate shape as substrate sank into sea-floor ooze. 4,5, Left-hand (4) and right-hand (5) views of articulated specimen, X 1, KU154014, from same exposure as number 3. Elongate shape as in number 3.6,7, Exterior (6) and interior (7) views of right valve, X 2, KU154011, middle part of section exposed at Locality lB. 8, Cluster of crowded, articulated specimens attached to fragment of inoceramid bivalve, X 1, KU154010, from lower part of member in section exposed in Sec. 21, T. 15 S., R. 26 W., Gove County, Kansas. 9, Interior view of left valve, X 1.5, KU154015, upper part of Smoky Hill section exposed at Locality 1.

10,11, Phelopteria sp. B. 10, Internal mold of left valve, x s, KU154020, upper part of section at Locality 13.11, Internal molds of paired valves, with small bits of shell, X 2, KU154019, upper part of section at Locality 13.

12, Inoceramus (Platyceramus) cycloides Wegner. Internal mold of right valve, X 1, KU153999, upper part of section at Locality 13.

13, Phelopteria sp. A. Interior view of left valve, X 1, KU154017, middle part of Smoky Hill Member in section exposed in Sec. 25, T. 14 S., R. 33 W., Logan County, Kansas.

black and white photos, plate 6

Explanation of Plate 7

Bivalves of the Smoky Hill Member

1, Inoceramus (Platyceramus) platinus Logan. Internal mold of right valve, with part of shell attached (lower left), X 0.5, KU153995, middle part of Smoky Hill Member in section exposed in Sec. 25, T. 14 S., R. 33 W., Logan County, Kansas.

2-5, Durania maxima Logan. 2, Ventral and 3, dorsal views of small, short specimen of lower valve, X 1, FHKSU4094, from middle? part of Smoky Hill Member, several miles south of Castle Rock in Trego? County, Kansas. Note heavy encrustation of lower surface (2) by Pseudoperna congesta, and smaller numbers of the same oyster on the dorsal and interior surfaces (3). 4, Lateral view of lower valve, X 1, KU154028, middle part of section exposed at Locality 17. 5, Lateral view oflower valve fragment, X 0.75, KU154016, from bed equivalent to unit 21-32, in section exposed in Sec. 16, T. 15 S., R. 32 W., Logan County, Kansas. Note abundant borings of acrothoracican cirripeds.

black and white photos, plate 7

Explanation of Plate 8

Ammonoids and cirripeds of Smoky Hill Member

1, Stramentum haworthi (Williston). Holotype, X 4, KUB323, from near Gove City, Gove County, Kansas, probably from middle part of Smoky Hill Member.

2,3, Zeugmatolepas sp. 2, Pair of specimens, X 5, KU154000, middle part of section at Locality 12. 3, Single specimen, X 5, KU154001, middle part of section at Locality 12. All specimens are epizoic on right valves of Pseudoperna congesta, which in turn is epizoic on an adult upper valve of Inoceramus (Volviceramus) grandis (Conrad).

4,5, Clioscaphites vermiformis (Meek and Hayden). 4, Mold of living chamber, X 1, KU154024, upper part of section at Locality 19. 5, Obliquely deformed specimen, X 1.25, KU154025, upper part of section at Locality 19.

6, Clioscaphites choteauensis Cobban, Lateral view of internal mold, X 1, KU154023, from middle part of Smoky Hill Member in section exposed in Sec. 9, T. 6 S., R. 19 W., Rooks County, Kansas. Specimen collected by M. V. Walker.

7,8, Baculites sp. (smooth). 7, Lateral view of compressed mold, X 1, KU154022, middle part of Smoky Hill Member in section exposed in Sec. 33, T. 14 S., R. 31 W., Gove County, Kansas. Note small epizoic oysters. 8, Lateral view of compressed mold, X 1, KU154021, middle part of Smoky Hill Member in section exposed in Sec. 25, T. 14 S., R. 33 W., Logan County, Kansas.

black and white photos, plate 8

Explanation of Plate 9

Bivalve and crinoids of the Smoky Hill Member

1, Inoceramus (Cladoceramus) undulatoplicatus Roemer. Internal mold of right valve with some shell attached, X 1, KU154029, 2.0 m (6.6 ft) below Marker Unit 7 at Locality 13.

2, Uintacrinus socialis Grinnell. Underside of thin slab showing portions of two articulated specimens, X 1, FHKSU14063, NW, Sec. 22, T .14 S., R. 32 W., Logan County, Kansas.

black and white photos, plate 9


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Kansas Geological Survey, Geology
Placed on web Feb. 20, 2015; originally published Dec. 1982.
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