USNM 44128, Split Mountain East Section (Cambrian of the United States)

Where: Esmeralda County, Nevada (37.8° N, 117.4° W: paleocoordinates 0.9° S, 92.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Cedaria selwyni small shelly zone, Emigrant Formation, Marjumian (504.5 - 497.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: offshore shelf; lithified limestone and lithified, concretionary, black chert

• interval from 9.85 to 15m above base of Emigrant Formation within a mudstone, beginning with silty limestone, ending with concretionary, bioclastic limestone

Size class: macrofossils

Reposited in the USNM

Primary reference: F. A. Sundberg. 2018. Trilobite biostratigraphy of the Cambrian 5 and Drumian stages, Series 3 (Laurentian Delamaran, Topazan, and Marjuman stages, Lincolnian Series) of the lower Emigrant Formation at Clayton Ridge, Esmeralda County, Nevada. Journal of Paleontology Memoir 92(S76):1-44 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 219682: authorized by Pete Wagner, entered by Pete Wagner on 16.04.2021

Creative Commons license: CC BY (attribution)

Taxonomic list

 Olenida - Cedariidae
Cedaria selwyni Pratt 1992 trilobite
 Ptychopariida - Marjumiidae
Coosella "sp. indet." Lochman 1936 trilobite
 Ptychopariida - Crepicephalidae
Crepicephalus "sp. indet." Owen 1852 trilobite
 Ptychopariida - Tricrepicephalidae
Meteoraspis "sp. indet." Resser 1935 trilobite
Tricrepicephalus "sp. indet." Kobayashi 1935 trilobite