Grandeur Member, Park City Formation of Montana (Permian of the United States)

Where: Montana (47.1° N, 109.4° W: paleocoordinates 17.4° N, 28.0° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Grandeur Member (Park City Formation), Leonardian (286.0 - 273.0 Ma)

• Upper Leonardian

• member-level stratigraphic resolution

Environment/lithology: marine; grainstone

• Grainstone altered in some locations to Coarsely Crystaline limestone.

Primary reference: E. L. Yochelson and D. H. Van Sickle. 1968. Biostratigraphy of the Phosphoria, Park City, and Shedhorn Formations; Geology of Permian Rocks in the Western Phosphate Field. United States Geological Survey Professional Paper 313(D):572-660 [A. Miller/C. Ferguson/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 11281: authorized by Arnold Miller, entered by Chad Ferguson on 31.07.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• Haplistion sp., Rugosa indet., Composita spp., Neospirifer sp., H. cf. wabashensis, Hystriculina sp., Annuliconcha sp., and Trilobita indet. from beds that are possibly older than the Grandeur Member.
Show authors, comments, and common names
Anthozoa
 Rugosa -
Rugosa indet.
Rugosa indet. horn coral
Demospongiae
 Spirosclerophorida - Haplistiidae
Haplistion sp.
Haplistion sp. Young and Young 1877 demosponge
Gnathostomata
  -
Osteichthyes indet.
Stenolaemata
 Trepostomata -
Trepostomata indet.
Trepostomata indet. Ulrich 1882
entered as "Terpostomata"
 Fenestrata -
Fenestrata indet.
Fenestrata indet. Elias and Condra 1957
Strophomenata
 Orthotetida - Derbyiidae
Derbyia sp.
Derbyia sp. Waagen 1884
 Strophomenida - Chonetidae
Chonetes sp.
Chonetes sp. Fischer de Waldheim 1830
 Productida - Echinoconchidae
Juresania sp.
Juresania sp. Fredericks 1928
 Productida - Paucispiniferidae
Hystriculina sp., Hystriculina cf. wabashensis
Hystriculina sp. Muir-Wood and Cooper 1960
Hystriculina cf. wabashensis Norwood and Pratten 1855
Rhynchonellata
 Spiriferida - Trigonotretidae
Neospirifer sp.
Neospirifer sp. Fredericks 1919
 Athyridida - Athyrididae
Composita spp.
Composita spp. Brown 1849
Lingulata
 Lingulida - Lingulidae
Lingula sp.
Lingula sp. Bruguiére 1797
Scaphopoda
 Dentaliida - Dentaliidae
Plagioglypta sp.
Plagioglypta sp. Pilsbry 1898 tusk shell
Bivalvia
 Nuculanida - Polidevciidae
Polidevcia cf. obesa
Polidevcia cf. obesa White 1879 clam
 Nuculida - Nuculidae
Nuculopsis sp.
Nuculopsis sp. Girty 1912 nut clam
 Trigoniida - Schizodidae
Schizodus sp.
Schizodus sp. King 1844 clam
 Pectinida - Annuliconchidae
Annuliconcha sp.
Annuliconcha sp. Newell 1938 scallop
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite