Basal Meagher, Meagher Fm.: St Davids, Montana

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Corynexochida - Dolichometopidae
Bathyuriscus cf. formosus
Trilobita - Ptychopariida - Ptychopariidae
Elrathina sp. Resser 1937
Trilobita - Ptychopariida - Alokistocaridae
cf. Elrathiella sp. Poulson 1927
Trilobita - Ptychopariida
Ptychoparioidea indet. (Matthew 1887)
Agnostida - Peronopsidae
Peronopsis cf. scutalis
Agnostida - Ptychagnostidae
Tomagnostus sp. Howell 1935
Ptychagnostus atavus (Tullberg 1880)
Lingulata - Acrotretida - Acrotretidae
Prototreta flabellata
see common names

Geography
Country:United States State/province:Montana County:Madison
Coordinates: 45.8° North, 111.7° West (view map)
Paleocoordinates:6.0° South, 85.4° West
Basis of coordinate:estimated from map
Time
Period: Cambrian Epoch: Miaolingian
10 m.y. bin: Cambrian 3-4
*Period:Middle Cambrian
Key time interval: St Davids Zone:  Bathyuriscus - Elrathina
Age range of interval: 509 - 497 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Meagher Member:basal
Stratigraphy comments: "Basal part of Fm. Bathyuriscus-Elrathina Zone." [lowermost 10-30 feet of formation]
Lithology and environment
Primary lithology:black,gray lithified "limestone"
Lithology description: [gray and black limestone with orange mottling.]
Environment:shallow subtidal indet.
Geology comments: "very calcareous green sh. BA2-3"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Taxonomic list comments:"Robinson, 1963. USGS Prof. Papr." [I entered info straight from the original reference in brackets like these, except in the county field. Species names were also added.]
Metadata
Database number:212
Authorizer:J. Sepkoski Enterer:M. Sommers
Modifier:J. Ju Research group:marine invertebrate
Created:1998-11-20 10:07:18 Last modified:2017-01-07 19:39:38
Access level:the public Released:1998-11-20 10:07:18
Creative Commons license:CC BY
Reference information

Primary reference:
455. G. D. Robinson. 1963. Geology of the Three Forks Quadrangle, Montana. United States Geological Survey Professional Paper 370:1-143 [J. Alroy/M. Sommers/J. Ju]