Rex Chert Member, Phosphoria Formation of Idaho (Permian of the United States)

Where: Idaho (44.0° N, 114.0° W: paleocoordinates 17.1° N, 34.1° W)

• coordinate based on political unit

• basin-level geographic resolution

When: Rex Chert Member (Phosphoria Formation), Wuchiapingian (259.9 - 254.2 Ma)

• Davydov et al. 2017 dated an ash bed in the upper Meade Peak Member at 260.57 ± 0.07 / 0.14 / 0.31 Ma, indicating that the Meade Peak is as young as uppermost Capitanian.

• member-level stratigraphic resolution

Environment/lithology: marine; chert and limestone

• Chert bed with limestone lenses

Size class: macrofossils

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 11283: authorized by Arnold Miller, entered by Chad Ferguson on 31.07.2001

Creative Commons license: CC BY (attribution)

Taxonomic list

• ?Nuculopsis sp., P. obesa, S. cf. montpelierensis, Streblochondria sp. possibly from Meade Peak Member. Babylonites sp. thought to be from beds older than Grandeur Member.
Show authors, comments, and common names
unclassified
  -
Porifera indet.
Porifera indet. Grant 1836
Anthozoa
 Rugosa -
Rugosa indet.
Rugosa indet. horn coral
Lingulata
 Lingulida - Lingulidae
Lingula carbonaria
Lingula carbonaria Shumard and Swallow 1858
Strophomenata
 Orthotetida - Derbyiidae
Derbyia sp.
Derbyia sp. Waagen 1884
 Productida - Linoproductidae
Anidanthus echaris, Cancrinella sp.
 Productida - Paucispiniferidae
aff. Liosotella sp.
aff. Liosotella sp. Cooper 1953
 Productida - Productidae
"Muirwoodia multistriatus" = Yakovlevia, Kochiproductus cf. longus, Kochiproductus sp.
"Muirwoodia multistriatus" = Yakovlevia
Kochiproductus sp. Dunbar 1955
 Productida - Productellidae
Echinauris sp., Antiquatonia cf. sulcatus
Echinauris sp. Muir-Wood and Cooper 1960
 Productida - Echinoconchidae
Bathymyonia cf. nevadensis
Rhynchonellata
 Rhynchonellida - Leiorhynchidae
Leiorhynchus sp.
Leiorhynchus sp. Hall 1860
 Athyridida - Athyrididae
Composita sp., Composita cf. mira
Composita sp. Brown 1849
Composita cf. mira Girty 1899
Stenolaemata
 Fenestrata -
Fenestrata indet.
Fenestrata indet. Elias and Condra 1957
 Trepostomata -
Trepostomata indet.
Trepostomata indet. Ulrich 1882
entered as "Terpostomata"
Bivalvia
 Nuculanida - Polidevciidae
Polidevcia obesa
Polidevcia obesa White 1879 clam
 Nuculida - Nuculidae
? Nuculopsis sp.
? Nuculopsis sp. Girty 1912 nut clam
 Pectinida - Aviculopectinidae
Aviculopecten sp.
Aviculopecten sp. M'Coy 1851 scallop
 Pectinida - Heteropectinidae
Girtypecten sp.
Girtypecten sp. Newell 1938 scallop
 Pectinida - Streblochondriidae
"Streblochondria cf. montpelierensis" = Streblopteria montpelierensis, Streblochondria sp.
"Streblochondria cf. montpelierensis" = Streblopteria montpelierensis Girty 1910 scallop
Streblochondria sp. Newell 1938 scallop
Gastropoda
 Euomphalina - Omphalotrochidae
Babylonites sp.
Babylonites sp. Yochelson 1956 snail
Cephalopoda
 Belemnoidea -
Belemnitida indet.
Belemnitida indet. Zittel 1895 belemnite
Gnathostomata
  -
Osteichthyes indet.