USNM 41938, Split Mountain, Clayton Ridge (Cambrian of the United States)

Where: Esmeralda County, Nevada (37.7° N, 117.5° W: paleocoordinates 1.2° S, 95.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Olenellus trilobite zone, Emigrant Formation, Dyeran (515.3 - 511.2 Ma)

• basal meter of Emigrant Formation; Olenellus 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 69204: authorized by Wolfgang Kiessling, entered by Benjamin Brenneis on 21.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Ptychopariida - Ptychopariidae
"Ptychopariidae" "sp. A", Ptychopariidae indet.
"Ptychopariidae" "sp. A" Matthew 1887 trilobite
"Ptychopariid sp.A"; total of 4 cranidia from loc. 41938 and 41939
Ptychopariidae indet. Matthew 1887 trilobite
"Kochaspid? sp."
 Redlichiida - Olenellidae
Olenellus sp.
Olenellus sp. Hall 1861 trilobite
total of seven fragmented cephala from loc. USNM 41938 and 41939
 Redlichiida - Biceratopsidae
Bolbolenellus brevispinus
Bolbolenellus brevispinus Palmer 1998 trilobite