Northern Montezuma Range, Poleta Fm., Nevadella zone, section MS 390-410: Montezuman, Nevada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Redlichiida - Holmiidae
Grandinasus argentus (Walcott 1910)
see common names

Geography
Country:United States State/province:Nevada County:Esmeralda
Coordinates: 37.7° North, 117.3° West (view map)
Paleocoordinates:3.5° South, 96.9° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Cambrian Epoch: Series 2
Stage: Stage 3 10 m.y. bin: Cambrian 2
Key time interval: Montezuman Zone:  Nevadella
Age range of interval: 519.9 - 514.8 m.y. ago
Stratigraphy
Formation:Poleta Member:Lower Mb.
Stratigraphic resolution:group of beds
Stratigraphy comments: Middle of lower member
Lithology and environment
Primary lithology: siltstone
Secondary lithology: sandstone
Lithology description: siltstone and fine sandstone
Environment:shallow subtidal indet.
Geology comments: 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
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Metadata
Database number:140572
Authorizer:W. Kiessling Enterer:M. Krause
Modifier:M. Krause Research group:marine invertebrate
Created:2013-03-12 19:45:56 Last modified:2013-03-13 06:26:43
Access level:authorizer only Released:2013-06-12 19:45:56
Creative Commons license:CC BY
Reference information

Primary reference:

45528. 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]