174-176 m above base of Montenegro Mbr, Campito Fm: Montezuman, Nevada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Hyolithia indet.
Trilobita - Redlichiida
Nevadia sp. Walcott 1910
Nevadia weeksi (Walcott 1908)
Trilobita - Redlichiida - Holmiidae
? Esmeraldina cometes Fritz 1995
recombined as Montezumaspis cometes
Palmettaspis sp. Fritz 1995
Palmettaspis consorta Fritz 1995
Esmeraldina sp. Resser and Howel 1938
see common names

Geography
Country:United States State/province:Nevada County:Esmeralda
Coordinates: 37.7° North, 117.7° West (view map)
Paleocoordinates:3.1° South, 96.8° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Cambrian Epoch:Series 2
Stage:Stage 3 10 m.y. bin:Cambrian 2
*Period:Early/Lower Cambrian - Middle Cambrian *Epoch:Waucoban
*International age/stage:Atdabanian *Local age/stage:Montezuman
Key time interval:Montezuman Trilobite zone: Fallotaspis- Nevadella
Age range of interval:519.90000 - 514.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Campito Member:Montenegro
Stratigraphic resolution:group of beds
Stratigraphy comments: 174 to 176m above the top of the underlying Andrews Mountain Member. NOTE: The base of the Montezuman Stage is determied to be at the base of the Nevadella Zone. Although conceptually the boundary would be placed on the earliest trilobite occurence, this is a very difficult point to define in the field. It should be noted that the use of the Nevadella Zone base for the base of the Montezuman Stage is not in agreement iwth the Cambrian age/stage chart published in Episodes, V. 23, no.3. THe chart has the interprettation of the Montezuman stage beginning at the Fallotaspis biozone (directly below the Nevadella Zone).
Lithology and environment
Primary lithology: lithified siltstone
Lithology description: shaly light olive grey sericitic siltstone.
Environment:marine indet.
Taphonomy
Collection methods and comments
Collection methods:bulk,field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:10555
Authorizer:M. Patzkowsky Enterer:P. Borkow
Modifier:A. Hendy Research group:marine invertebrate
Created:2001-05-21 10:53:47 Last modified:2009-06-12 17:12:57
Access level:the public Released:2001-05-21 10:53:47
Creative Commons license:CC BY
Reference information

Primary reference:
3901. J. S. Hollingsworth. 1999. A second candidate position for the base of the Montezuman. Laurentai 99: V field conference of the Cambrian Stage Subdivision Working Group, International Subcommission on Cambrian Stratigraphy 42-46 [M. Patzkowsky/P. Borkow]