Above Montezuman/Dyeran proposed stratotype, Nevada - Hollingsworth 1999 (Cambrian of the United States)

Where: Esmeralda County, Nevada (37.8° N, 117.3° W: paleocoordinates 1.3° S, 94.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: middle Member (Poleta Formation), Dyeran (516.0 - 513.0 Ma)

• depostied above storm wave base. The base of the Dyeran is 88m above the base of the middle member of the Poleta Formation

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, gray, calcareous siltstone and lithified, shelly/skeletal limestone

• light olive gray shaly siltstone with beds of laminated fine sandstone (5-35%), sometimes calcareous and occasionally occurring in hummocky crossbedded lenses and gutter casts. Cream colored bioclastic limestone in 1-7cm thick layers and occassionally as gutter fillings, make up 5-40% of the interval. Many of the bioclastic layers contain tubular fossils.

Preservation: trace

Collection methods: bulk,

• Most of the trilobites are found as broken sclerites in thin bioclastic limestone, but intact cephala are occasionally found in the shaly siltstone.

Primary reference: J. S. Hollingsworth. 1999. Proposed stratotype section and point for the base of the Dyeran Stage. Laurentai 99: V field conference of the Cambrian Stage and Subdivision 38-42 [M. Patzkowsky/P. Borkow]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 10497: authorized by Mark Patzkowsky, entered by Phil Borkow on 11.05.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

Hyolithia indet.
probably orthothecid
 Obolellida - Obolellidae
Obolella sp. Billings 1861
Trilobita indet. Walch 1771 trilobite
Species wanneriid with undescribed new genus