Separation Canyon, USGS 25139-PC (Carboniferous of the United States)

Also known as Separation Canyon, collection 7 ft above base of formation

Where: Arizona (35.8° N, 113.6° W: paleocoordinates 1.2° N, 44.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Watahomigi Formation (Supai Group), Morrowan (323.2 - 318.6 Ma)

• The Watahomigi is comprised of three informal units: a lower slope unit, a middle cliff unit, and an upper slope unit.

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified, gray, conglomeratic limestone and lithified, conglomeratic sandstone

• Conglomerate, dark-reddish-brown, forms thin, resistant ledge. Matrix: gray and reddish-brown sandstone to gray, granular limestone. Gravel: white and gray chert, white and red quartz; average diameters 0.25-0.5 in (maximum 1.5 in); angular to rounded, mostly subangular; very concentrated locally, elsewhere scattered; locally contains fossills.

Size class: macrofossils

Reposited in the USGS

Primary reference: E. D. McKee. 1982. The Supai Group of the Grand Canyon. United States Geological Survey Professional Paper 1173 [J. Alroy/C. Simpson/C. Simpson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 42700: authorized by John Alroy, entered by Carl Simpson on 04.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Chondrichthyes
 Cochliodontiformes - Cochliodontidae
Deltodus sp.
Deltodus sp. Morris and Roberts 1862 chimaera
Dentition
unclassified
  -
Pelmatozoa indet.
Pelmatozoa indet. Leuckart 1848
Debris
Echinoidea
  -
Echinoidea indet.
Echinoidea indet. Leske 1778 sea urchin
Spines
Rhynchonellata
 Spiriferida - Spiriferidae
Anthracospirifer tanoensis
 Athyridida - Athyrididae
Composita gibbosa
Rostroconchia
 Conocardiida - Bransoniidae
Pseudoconocardium sp.
Pseudoconocardium sp. Zavodowsky 1960
Gastropoda
 Bellerophontida - Bellerophontidae
Bellerophontidae indet.
Bellerophontidae indet. M'Coy 1851 snail
 Euomphalina - Microdomatidae
Microdoma sp.
Microdoma sp. Meek and Worthen 1867 snail
 Euomphalina - Euomphalidae
Straparollus sp.
Straparollus sp. de Montfort 1810 snail
 Murchisoniina - Eotomariidae
Euconospira sp.
Euconospira sp. Ulrich and Scofield 1897 snail
 Murchisoniina - Gosseletinidae
Baylea sp.
Baylea sp. de Koninck 1881 snail
Bivalvia
 Nuculida - Nuculidae
Nuculopsis sp.
Nuculopsis sp. Girty 1912 nut clam
 Cardiida - Kalenteridae
Permophorus sp.
Permophorus sp. Chavan 1954 clam
 Mytilida - Mytilidae
Promytilus sp.
Promytilus sp. Newell 1942 mussel
 Ostreida - Pterineidae
Leptodesma sp.
Leptodesma sp. Hall 1883 oyster
 Pectinida - Aviculopectinidae
Aviculopecten gravidus, Aviculopecten sp.
Aviculopecten sp. M'Coy 1851 scallop
 Myalinida - Myalinidae
Septimyalina sp.
Septimyalina sp. Newell 1942 clam
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite
Hypostome