Collection 18664-PC, Little Flat Fm., Sandy Limestone Member, Chesterfield Range: Meramecian, Idaho

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Anthozoa - Stauriida - Hapsiphyllidae
Zaphrenites sp. ()
original and current combination Zaphrentites
Anthozoa - Stauriida - Ekvasophyllidae
Ekvasophyllum sp. Parks 1951
Anthozoa - Stauriida - Lithostrotionidae
Siphonodendron sp. McCoy 1849
indet., fragment
Strophomenata - Productida - Productidae
Dictyoclostus sp.
Strophomenata - Productida - Echinoconchidae
Echinoconchus (cf. Echinoconchus) alternatus (Norwood and Pratten 1855)
Rhynchonellata - Spiriferinida - Punctospiriferidae
Punctospirifer sp. North 1920
Rhynchonellata - Spiriferida - Spiriferidae
Spirifer sp. Sowerby 1818
Rhynchonellata - Spiriferida - Brachythyrididae
Brachythyris (aff. Brachythyris) subcardiiformis
Gastropoda - Euomphalina - Platyceratidae
Platyceras sp. Conrad 1840
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: Echinoconchus
Age range of interval:343.10000 - 335.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Little Flat Member:Sandy Limestone
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: sandy "limestone"
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 is Syringoporoid coral, indet., horn coral, indet., large horn corals cf. Canadiphyllum, echinoderm plates,indet., and incrusting forms, undet.
Metadata
Database number:12821
Authorizer:T. Olszewski Enterer:M. Gibson
Modifier:T. Olszewski Research group:marine invertebrate
Created:2001-12-18 07:13:10 Last modified:2006-08-09 15:39:10
Access level:the public Released:2001-12-18 07:13:10
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]