Fremont Massive Dolomite: Maysvillian - Richmondian, Colorado

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chlorophyceae - Receptaculitidae
Receptaculites cf. articus
Anthozoa - Stauriida - Streptelasmatidae
Streptelasma sp. Hall 1847
Anthozoa - Heliolitida - Halysitidae
Halysites cf. robustus Wilson 1926
recombined as Catenipora robusta
Halysites cf. delicatulus Wilson 1926
recombined as Catenipora delicatulus
Anthozoa - Sarcinulida - Syringophyllidae
Calapoecia sp. Billings 1865
Cephalopoda - Endocerida - Endoceratidae
Cyclendoceras sp. Grabau and Shimer 1910
Endoceras spp.
Cephalopoda - Pseudorthocerida - Spyroceratidae
Spyroceras sp. Hyatt 1884
Cephalopoda - Orthocerida - Kionoceratidae
Kionoceras sp. Hyatt 1884
Cephalopoda - Orthocerida - Proteoceratidae
Ephippiorthoceras spp.
Cephalopoda - Actinocerida - Actinoceratidae
Actinoceras sp. Bronn 1837
Cephalopoda - Actinocerida - Gonioceratidae
Lambeoceras sp. Foerste 1917
Cephalopoda - Oncocerida - Oncoceratidae
Neumatoceras sp. Foerste 1935
Beloitoceras sp. Foerste 1924
Cephalopoda - Ascocerida - Probillingsitidae
Probillingsites sp. Foerste 1928
Gastropoda - Murchisoniina - Trochonematidae
Trochonema umbilicatum (Hall 1847)
recombined as Trochonema umbilicata
Gastropoda - Bellerophontida - Bucanellidae
Bucanella sp. Meek 1871
Gastropoda - Euomphalina - Helicotomidae
Helicotoma sp. Salter 1859
Strophomenata - Strophomenida - Strophomenidae
Strophomena spp.
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Rhynchotrema argenturbicum (White 1874)
recombined as Hypsiptycha argenturbicum
Lepidocyclus?
Rhynchonellata - Orthida - Plaesiomyidae
Plaesiomys bellilamellosus Wang 1949
Crinoidea
Crinoidea indet. Miller 1821
Rhombifera - Echinosphaeritidae
? Echinosphaerites sp. Wahlenberg 1818
see common names

Geography
Country:United States State/province:Colorado
Coordinates: 38.0° North, 105.0° West (view map)
Paleocoordinates:15.0° South, 71.2° West
Geographic resolution:local area
Time
Period:Ordovician Epoch:Late/Upper Ordovician
*Period:Late/Upper Ordovician *Epoch:Ashgill
*Local age/stage:Maysvillian - Richmondian
Key time interval:Maysvillian - Richmondian Conodont zone: Amorphognathus superbus
Age range of interval:452.00000 - 443.70000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Fremont Member:Massive Dolomite
Stratigraphic resolution:member
Stratigraphy comments: Massive Dolomite portion that should be it's own Member. (PJW transcribing!)
Lithology and environment
Primary lithology:red lithified cherty/siliceous dolomite
Includes fossils?Y
Lithology description: Dolomite, cherty, massive, gray-buff, pinkish, reddish, finely to coarsely crystalline, deeply weathered at base.
Environment:shallow subtidal indet. Tectonic setting:cratonic basin
Geology comments: Environment, tectonic setting, and modes of preservation from S. Holland.
Taphonomy
Modes of preservation:body,original calcite,replaced with calcite,replaced with silica
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:all microfossils,species names,difficult macrofossils
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:10338
Authorizer:S. Holland Enterer:T. Hanson
Modifier:P. Wagner Research group:marine invertebrate
Created:2001-04-04 12:04:00 Last modified:2018-05-14 22:52:01
Access level:the public Released:2001-04-04 12:04:00
Creative Commons license:CC BY
Reference information

Primary reference:

3828. W. C. Sweet. 1954. Harding and Fremont Formations, Colorado. Bulletin of the American Association of Petroleum Geologists 38(2):284-305 [S. Holland/T. Hanson]