Hammock Ranch 50, Deadwood Formation, Custer county South Dakota - Stitt 1998 (Cambrian of the United States)

Where: Custer County, South Dakota (43.8° N, 103.8° W: paleocoordinates 11.6° S, 87.5° W)

• outcrop-level geographic resolution

When: Cedarina dakotaensis zone, Deadwood Formation, Menevian (504.5 - 499.5 Ma)

• bed-level stratigraphic resolution

Environment/lithology: shoreface; lithified, pebbly, yellow sandstone

• section is 33.5 m thick. pebble sandstone consists of 2.7 to 15.8m of yellowish, medium to thick bedded medium to coarse, cross-bedded sandstone containing lenses and thin beds of quartz pebbles.

Collection methods: Collections made by Christina Lochman-Balk. The lithologic descriptions of the sections are derived from Lochman-Balk's field notes and Stitt's field reconnaissance.

Primary reference: J. H. Stitt. 1998. Trilobites from the Cedarina dakotaensis zone, lowermost part of the Deadwood Formation, (Marjuman Stage, Upper Cambrian), Black Hills South Dakota. Journal of Paleontology 72(6):1030-1046 [M. Patzkowsky/P. Borkow/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 8241: authorized by Mark Patzkowsky, entered by Phil Borkow on 02.07.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• Species of Arapahoia, Menomonia, Hardyoides, Welleraspis, Kormagnostus, and Kingstonia are found in the Black Hills, but their presence in measured beds is not given. Abbreviations are as follows: if three numbers (cranidia-pygidia-librigenae) for polymeroids and two numbers (cephala-pygidia) for agnostostids.
Show authors, comments, and common names
Lingulata
 Lingulida - Obolidae
Dicellomus sp.
Trilobita
 Ptychopariida - Menomoniidae
"Hysteropleura schucherti" = Bolaspidella, Menomonia prooculis
"Hysteropleura schucherti" = Bolaspidella trilobite
3-0-0
Menomonia prooculis trilobite
3-0-0
 Ptychopariida - Catillicephalidae
Welleraspis spp.
Welleraspis spp. Kobayashi 1935 trilobite
1-0-0 NOTE: This occurance represents group #2 of the Welleraspis
 Olenida - Cedariidae
Cedarina dakotaensis
Cedarina dakotaensis Stitt 1998 trilobite
25-1-1