Collection 18658-PC, Little Flat Fm., Sandstone Member, Chesterfield Range: Meramecian, Idaho
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Rhynchonellata
- Spiriferida
- Brachythyrididae
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Brachythyris sp.
M'Coy 1844
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Rhynchonellata
- Spiriferida
- Spiriferidae
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Spirifer sp.
Sowerby 1818
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Strophomenata
- Productida
- Monticuliferidae
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Striatifera sp.
Chao 1927
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Strophomenata
- Productida
- Productidae
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Auloprotonia sp.
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Dictyoclostus sp.
Muir-Wood 1930
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| very large | ||||||||||
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Strophomenata
- Productida
- Echinoconchidae
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Echinoconchus (aff. Echinoconchus) alternatus
(Norwood and Pratten 1855)
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| entered as "Echinocinchus" | ||||||||||
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Strophomenata
- Productida
- Araksalosiidae
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Quadratia (cf. Quadratia) hirsutiformis
(Walcott 1884)
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Strophomenata
- Orthotetida
- Orthotetidae
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Orthotetes (cf. Orthotetes) kaskaskiensis
(McChesney 1860)
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| abundant | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Idaho |
| Coordinates: | 43.8° North, 111.7° West (view map) | ||
| Paleocoordinates: | 0.7° South, 44.2° West | ||
| Geographic resolution: | small collection |
Time
| Period: | Carboniferous | Epoch: | Mississippian |
| Stage: | Visean | 10 m.y. bin: | Carboniferous 2 |
| *Period: | Middle Carboniferous | ||
| Key time interval: | Meramecian | Zone: | Quadratia |
| Age range of interval: | 343.1 - 335.8 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Little Flat | Member: | Sandstone | ||
| Stratigraphy comments: The Mississippian rocks in the Chesterfield Range consist of Lodgepole limestone overlain by a 1900ft. limestone-sandstone sequence here designated the Chesterfield Range Group. The lower terrigenous part, about 965 ft. thick is the Little Flat Fm., it has a basal siltstone member, a middle sandstone member, and an upper sandy limestone member. The upper part of the Chesterfield Range Group, here named the Monroe Canyon Limestone is about 925 ft. thick and contains a lower massive member and a medial medium-bedded member, and an upper cherty member. The range stretches northwest from Soda Springs, Idaho. It is an eastern dipping block of Paleozoic strata irregularly overlapped by the Tertiary Salt Lake Fm. |
Lithology and environment
| Primary lithology: | calcareous sandstone |
| Lithology description: The formation is mostly quartzose in the lower part, but contains carbonate cement and some limestone interbeds near the base. The lower 126ft. consists of pale red, pinkish weathering siltstone and fine-grained sandstone with two fine-grained cherty limestone units. This is the siltstone member. The overlying 551ft. of beds is fine-grained, calcareous quartz sandstone and quartzose limestone in relatively thin, platy beds. They make up the sandstone member. Limestone is more abundant in the upper part of the formation, which has been separated out as the sandy limestone member, 288ft. thick. | |
Taphonomy
Collection methods and comments
| Taxonomic list comments:Also included are ramose and incrusting forms, undet., productoid fragments, indet, and brachiopod fragments, indet. |
Metadata
| Database number: | 12814 | ||
| Authorizer: | T. Olszewski | Enterer: | M. Gibson |
| Modifier: | T. Olszewski | Research group: | marine invertebrate |
| Created: | 2001-12-18 06:41:56 | Last modified: | 2006-08-09 15:39:10 |
| Access level: | the public | Released: | 2001-12-18 06:41:56 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 4279. | J. T. Dutro and W. J. Sando. 1963. New Mississippian Formations and Faunal Zones in Chesterfield Range, Portneuf Quadrangle Southeast Idaho. Bulletin of the American Association of Petroleum Geologists 47(11):1963-1986 [T. Olszewski/M. Gibson] |