Isolated hardground of Clark Fork [Snow Range Fm]: Franconian, Wyoming
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Trilobita
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Trilobita indet.
Walch 1771
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unclassified
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Echinodermata indet.
Klein 1754
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| represents at least 2 other echinoderms of unknown affinity and 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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Crinoidea
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Crinoidea indet.
Miller 1821
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unclassified
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Cyanobacteria indet.
Stanier 1973
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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: | Wyoming | County: | Park |
| Coordinates: | 44.8° North, 109.3° West (view map) | ||||
| Paleocoordinates: | 7.8° South, 82.3° West | ||||
| Geographic resolution: | small collection |
Time
| Period: | Cambrian | Epoch: | Furongian |
| 10 m.y. bin: | Cambrian 5 | ||
| *Period: | Late/Upper Cambrian | *Epoch: | Merioneth |
| *International age/stage: | Early/Lower Franconian - Middle Franconian | *Local age/stage: | Early/Lower Dolgellian |
| Key time interval: | Franconian | Zone: | Elvinia |
| Age range of interval: | 497.00000 - 485.40000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Snowy Range | Member: | Sage | ||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: General for member: Storm deposit, as a whole represents a transitional facies intermediate between nearshore clastics and outer-shelf carbonates. The Sage Member (occurance of hardgrounds) is 36-37m thick with the hardgrounds forming on upper surfaces of carbonate flat pebble conglomerates. Some of the hardgrounds developed on hummocky mound-like masses of micritic sediments (boundstones or lithoherms). | |||||
Lithology and environment
| Primary lithology: | burrows,hardground,pebbly lithified conglomerate |
| Lithology description: General for 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. The specimens are from an isolated hardground on a pebble conglomerate. | |
| 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#94.3 | ||
| Database number: | 9928 | ||
| Authorizer: | M. Patzkowsky | Enterer: | P. Borkow |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2001-02-01 12:02:00 | Last modified: | 2009-05-19 14:46:37 |
| Access level: | the public | Released: | 2001-02-01 12:02:00 |
| 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] |