Hilltop, near Havasu Canyon, Beta bed 2, 38 feet (Permian of the United States)

Where: Arizona (36.2° N, 112.7° W)

• Paleocoordinates: 10.0° N, 36.8° W (Wright 2013)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Fossil Mountain Member (Kaibab Formation), Kungurian (283.3 - 274.4 Ma)

• Beta member

• group of beds-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lithified, gray, cherty/siliceous limestone

• Limestone, gray, crystalline, free from clastic sand; contains masses of white chert scattered throughout; brown chert occurs as more or less definite bands, each 6-12 inches thick, accompanied by occasional yellow sandy bands, in upper 83.5 feet (bands more definite toward top), also in scattered places throughout middle 71.5 feet, but not at all in bottom 44 feet; shows gradual transition upward from one chert type to another; weathers to series of ledges forming large cliff in places, to pinnacles in others; highly fossiliferous throughout except in upper very cherty part.

Size class: macrofossils

Preservation: mold/impression

Collection methods: Repository: Grand Canyon National Park Museum (types or all now at USNM)

Primary reference: E. D. McKee. 1938. The environment and history of the Toroweap and Kaibab Formations of northern Arizona and southern Utah. Carnegie Institution of Washington Publication 492:1-268 [G. Webster/G. Webster/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 148744: authorized by Matthew Clapham, entered by Matthew Clapham on 25.07.2013

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Rhynchonellata
 Spiriferinida - Spiriferinidae
"Spiriferina" sp.
"Spiriferina" sp. d'Orbigny 1847
 Athyridida - Athyrididae
Composita sp.
Composita sp. Brown 1849
 Spiriferida - Elythidae
"Squamularia" sp.
"Squamularia" sp. Gemmellaro 1899
Probably an Elythid
Strophomenata
 Productida - Productellidae
Echinauris sp., "Productus occidentalis" = Rugatia occidentalis
Echinauris sp. Muir-Wood and Cooper 1960
"Productus occidentalis" = Rugatia occidentalis Newberry 1861
 Productida - Productidae
"Productus bassi" = Peniculauris bassi
"Productus bassi" = Peniculauris bassi McKee 1938
 Orthotetida - Derbyiidae
Derbyia sp.
Derbyia sp. Waagen 1884
Stenolaemata
  -
Stenolaemata indet.
Anthozoa
 Stauriida - Lophophyllidae
"Lophophyllum" sp.
"Lophophyllum" sp. Milne-Edwards and Haime 1850 horn coral