Upper Deadwood Formation, Crook County (Cambrian of the United States)

Where: Crook County, Wyoming (44.5° N, 104.4° W: paleocoordinates 11.5° S, 81.4° W)

• coordinate based on political unit

When: Ptychaspis-Prosaukia trilobite zone, Deadwood Formation, Franconian (497.0 - 485.4 Ma)

• Upper Deadwood, "medial late Cambrian". Trilobites indicate Ptychaspis-Prosaukia zone, Croixian Series, Franconian Stage

• group of beds-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; calcareous siltstone

• Not described but other Deadwood samples in this region are shallow coastal
• Pink, bioclastic calcareous siltstone

Size class: mesofossils

Collection methods: Collected by Christina Lochman-Balk and her students. Only trilobites are included in the collection.

Primary reference: J. E. Repetski. 1978. A Fish from the Upper Cambrian of North America. Science 200(4341):529-531more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 238626: authorized by Phil Novack-Gottshall, entered by Phil Novack-Gottshall on 01.02.2025

Creative Commons license: CC BY (attribution)

Taxonomic list

• Abundances are listed as cranidia-pygidia-librigenae-hypostomes (C-P-L-H), for polymeroid trilobites, cephala-pygidia (C-P) for agnostid trilobites, and number of valves for brachiopods.
Show authors, comments, and common names
Trilobita
 Asaphida - Ptychaspididae
Ptychaspis striata
  - Ellipsocephaloididae
Ellipsocephaloides sp.
Ellipsocephaloides sp. Kobayashi 1935 trilobite
 Asaphida - Ptychaspididae
? Ptychaspis tuberosa
? Ptychaspis tuberosa Feniak 1952 trilobite
Agnatha
  -
Anatolepis cf. heintzi
Anatolepis cf. heintzi Brockelie and Fortey 1976 jawless fish