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