Sage Mbr, Snowy Range Fm: Trempealeauan, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Echinodermata indet.
Klein 1754
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| represents at least 2 other unknown echinoderms and the unknown pelmatozoan holdfast | ||||||||||
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Stylophora
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Stylophora indet.
Gill and Caster 1960
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Edrioasteroidea
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Edrioasteroidea indet.
Billings 1858
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Chabakoviacea
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Renalcis sp.
Vologdin 1932
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| tentative identification | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Montana | County: | Carbon |
| Coordinates: | 45.2° North, 109.2° West (view map) | ||||
| Paleocoordinates: | 7.8° South, 81.9° West | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cambrian | Epoch: | Furongian |
| 10 m.y. bin: | Cambrian 5 | ||
| *Period: | Late/Upper Cambrian | *Epoch: | Merioneth |
| *International age/stage: | Late/Upper Dolgellian | *Local age/stage: | Early/Lower Trempealeauan |
| Key time interval: | Trempealeauan | Zone: | Illaenurus |
| Age range of interval: | 489.20000 - 485.40000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Snowy Range | Member: | Sage | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: Represent storm deposits. The formation as a whole represents a transitional facies, intermediate between nearshore clastics and outer-shel carbonates. The Sage Member (occurence of hardgrounds) is 36-67m thick with the hardgrounds forming on upper surfaces of carbonate, flat pebble conglomerates. | |||||
Lithology and environment
| Primary lithology: | burrows,hardground,flat-pebble lithified carbonaceous conglomerate |
| Lithology description: General lithology of member: Greenish-gray, soft shale with abundant interbedded greenish carbonate, flat pebble conglomerates (intrasparrudites), calcarenites (biosparite), calcisilites (biopelmicrites and biopelsparites) and columnar to tabular algal limestones. Specimens associated with the hardgrounds. Lithology/placement of hardgrounds: upper surfaces of carbonate, flat pebble conglomerates. | |
| Environment: | shallow subtidal indet. |
Taphonomy
Collection methods and comments
| Collection excludes: | some macrofossils,species names |
| Collection methods: | field collection |
| Reason for describing collection: | paleoecologic analysis |
Metadata
| Also known as: | HG#94.1 | ||
| Database number: | 9920 | ||
| Authorizer: | M. Patzkowsky | Enterer: | P. Borkow |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2001-01-31 12:01:00 | Last modified: | 2009-05-19 14:45:56 |
| Access level: | the public | Released: | 2001-01-31 12:01:00 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 864. | C. E. Brett, W. D. Liddell, and K. L. Derstler. 1983. Late Cambrian hard substrate communities from Montana/Wyoming: the oldest known hardground encrusters. Lethaia 16(4):281-289 [M. Patzkowsky/P. Borkow] |
Secondary references:
| 29272 | A. Hendy, M. Aberhan, J. Alroy, M. Clapham, W. Kiessling, A. Lin, and M. LaFlamme. 2009. Unpublished ecological data in support of GSA 2009 abstract: A 600 million year record of ecological diversification. [A. Hendy/A. Hendy/A. Hendy] |