Northern Montezuma Range, Poleta Fm., Nevadella zone, section MS 390-410 (Cambrian of the United States)

Where: Esmeralda County, Nevada (37.7° N, 117.3° W: paleocoordinates 3.5° S, 96.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Nevadella zone, Lower Mb. Member (Poleta Formation), Montezuman (520.0 - 515.3 Ma)

• Middle of lower member

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; siltstone and sandstone

• Montenegro Member is 349 m thick. The lower 144 m is light brown sericitic siltstone and fine sandstone. The next 21 m interval contains silstone with quartzite and sandstone beds, and lenses of bioclastic carbonate packstone and glauconitic arenaceous limestone. The upper 184 m is greenish gray shaly siltstone with occasional lenses of fine sandstone. Near the top of the member there are thin beds of sandstone and bioclastic limestone
• siltstone and fine sandstone

Size classes: macrofossils, mesofossils

Primary reference: J. S. Hollingsworth. 2006. Holmiidae (Trilobita: Olenellina) of the Montezuman Stage (Early Cambrian) in Western Nevada. Journal of Paleontology 80(2):309-332 [W. Kiessling/M. Krause]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 140572: authorized by Wolfgang Kiessling, entered by Mihaela Krause on 12.03.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Redlichiida - Holmiidae
Grandinasus argentus
Grandinasus argentus Walcott 1910 trilobite