AMNH loc. 3296 (Cretaceous of the United States)

Where: South Dakota (45.0° N, 104.0° W: paleocoordinates 50.8° N, 70.5° W)

When: Gammon Ferruginous Member (Pierre Shale Formation), Middle Campanian (83.5 - 70.6 Ma)

Environment/lithology: basinal (); bentonitic, red, silty shale

• The fossiliferous interval is bounded by the Groat Sandstone below and Ben-tonite “H” of Knechtel and Patterson (1956) above. The interval is approximately 20 m thick and consists of bentonitic silty shale containing large grayish-red to blackish-red sideritic concretions and small grayish-orange apatite concretions (g. 3). It occupies the lower Campanian Baculites sp. smooth Zone and crops out over an area of more than 8 km2

Size class: macrofossils

Preservation: concretion, original aragonite

Primary reference: N.H. Landman, R.H.B. Fraaije, S. M. Klofak, N. L. Larson, G. A. Bishop and I. Kruta. 2014. Inquilinism of a Baculite by a Dynomenid Crab from the Upper Cretaceous of South Dakota. American Museum Novitates 3818:1-16 [M. Clapham/J. Fearon/J. Fearon]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 235333: authorized by Matthew Clapham, entered by J Fearon on 28.06.2024

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Pierrella larsoni, Platyscaphites sp., Dakotacancer sp.
Malacostraca
 Decapoda - Nephropidae
Hoploparia sp.
Hoploparia sp. Karasawa 1998 clawed lobster
 Decapoda - Callianassidae
Protocallianassa sp.
Protocallianassa sp. Beurlen 1930 decapod
 Decapoda - Sphaerodromiidae
Ferricorda kimberleyae
Ferricorda kimberleyae Bishop 1987 crab
 Decapoda - Necrocarcinidae
Necrocarcinus sp.
Necrocarcinus sp. Bell 1863 crab
Cephalopoda
 Ammonitida - Pachydiscidae
Pachydiscus sp.
Pachydiscus sp. Zittel 1884 ammonite
 Ammonitida - Placenticeratidae
Placenticeras sp.
Placenticeras sp. Meek 1876 ammonite
Gastropoda
 Basommatophora - Siphonariidae
Anisomyon sp.
Anisomyon sp. Meek and Hayden 1860 pulmonate