19m above base of section MW-3, Campito Fm., NV - Hollingsworth 1999: Montezuman - Atdabanian, Nevada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Sabelliditida - Sabelliditidae
Sabellidites canadiensis
Orthothecimorpha - Circothecida
Ladatheca cylindrica (Grabau 1900)
Kutorginata - Kutorginida - Nisusiidae
? Nisusia sp. Walcott 1905
unclassified
? Onuphlonella sp.
Trilobita - Redlichiida - Fallotaspididae
cf. Eofallotaspis sp. Sdzuy 1978
unclassified
? Bergaueria sp. Prantl 1946
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:local area
Time
Period: Cambrian Epoch: Series 2
Stage: Stage 3 10 m.y. bin: Cambrian 2
*Period:Early/Lower Cambrian *Epoch:Waucoban
*International age/stage:Late/Upper Tommotian - Atdabanian *Local age/stage:Montezuman
Key time interval: Montezuman - Atdabanian Zone:  Fallotaspis
Age range of interval: 519.9 - 515.6 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Campito Member:Montenegro
Local section:MW-3
Stratigraphic resolution:group of beds
Stratigraphy comments: 19m from the base of the section and 9m thick. Conceptually, the boundary for the Montezuman stage should be placed on the earliest trilobite occurrence, but this is a very difficult point to define in the field. The reference point for the base of the Montezuman stage is at the base of the abundance and range zone of an Eofallotaspis-like trlobite which is 15.4m above a quartzite selected as the top of the Andrews Mountains Member (315m below the top of the Campito Formation).
Lithology and environment
Primary lithology: lithified silty "shale"
Secondary lithology: lithified argillaceous sandstone
Includes fossils?Y
Lithology description: silty shale and argillaceous fine-grained micaceous sandstone that is very thin-bedded to wavy-bedded at the top.
Environment:transition zone/lower shoreface
Taphonomy
Collection methods and comments
Collection methods:bulk,field collection
Reason for describing collection:biostratigraphic analysis
Taxonomic list comments:The list is actually a composite for 3 sections with the same faunal occurrences (Section MW-3, MW-3S, and MW-3) located within 50 miles of each other.
Metadata
Database number:10574
Authorizer:M. Patzkowsky Enterer:P. Borkow
Modifier:C. Visaggi Research group:marine invertebrate
Created:2001-05-24 13:44:26 Last modified:2004-07-07 20:29:21
Access level:the public Released:2001-05-24 13:44:26
Creative Commons license:CC BY
Reference information

Primary reference:
3910. J. S. Hollingsworth. 1999. A candidate position for the base of the Montezuman stage. Laurentia 99: V field conference of the Cambrian Stage Subdivision Working Group, International Subcomission on Cambrian Stratigraphy 34-37 [M. Patzkowsky/P. Borkow]