USNM 41944, Split Mountain, Clayton Ridge (Cambrian of the United States)

Where: Esmeralda County, Nevada (37.7° N, 117.5° W: paleocoordinates 1.0° S, 93.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Eokochaspis nodosa trilobite zone, Emigrant Formation, Delamaran (511.2 - 506.5 Ma)

• 1.75 to 9.5m above base of Emigrant Formation; Eokochaspis nodosa Biozone of Lowermost Middle Cambrian

• group of beds-level stratigraphic resolution

Environment/lithology: offshore shelf; lithified, argillaceous mudstone

• basal 20m of Emigrant Formation consists of mudrock facies containing a few thin, argillaceous limestone beds

Size class: macrofossils

Reposited in the USNM

Collection methods: bulk,

Primary reference: F. A. Sundberg and L.B. McCollum. 2003. Early and Mid Cambrian Trilobites from the Outer-shelf Deposits of Nevada and California, USA. Palaeontology 46(5):945-986 [W. Kiessling/B. Brenneis]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 69271: authorized by Wolfgang Kiessling, entered by Benjamin Brenneis on 23.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Ptychopariida -
Eokochaspis nodosa
Eokochaspis nodosa Sundberg and McCollum 2000 trilobite
total of 135 cranidia, 23 librigenae, 11 pygidia from loc. USNM 41940-41950