National Canyon, USGS 25127-PC (Carboniferous of the United States)

Also known as Lower Slope unit

Where: Arizona (36.1° N, 112.9° W: paleocoordinates 1.1° N, 43.4° W)

• outcrop-level geographic resolution

When: Watahomigi Formation (Supai Group), Morrowan (318.1 - 314.6 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: marine; lithified, sandy, calcareous conglomerate

• Conglomerate; reddish-brown, sandy; forms thin, resistant ledge. Matrix: sand, calcitic, granular, friable; weathers to sandy surface. Gravels: chert, red, yellow and a few white; mematitic rock, red-brown; subangular to subrounded; average diameter 0.25-0.5 in., maximum 2 in.; contains abundant fossils.

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 42800: authorized by John Alroy, entered by Carl Simpson on 05.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Proetida - Phillipsiidae
Rhynchonellata
 Athyridida - Athyrididae
 Terebratulida -
Terebratulida indet. Waagen 1883
Dielasmid
 Spiriferida - Spiriferidae
 Rhynchonellida -
Rhynchonellida indet. Kuhn 1949
N. gen. Aff. Anteridocus n. sp.
Bivalvia
  -
Bivalvia indet. Linnaeus 1758 clam
 Myalinida - Myalinidae
Septimyalina sp. Newell 1942 clam
 Pectinida - Aviculopectinidae
Aviculopecten sp. M'Coy 1851 scallop
 Cardiida - Kalenteridae
Permophorus sp. Chavan 1954 clam
 Trigoniida - Schizodidae
Schizodus sp. King 1844 clam
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
 Trochonematoidea - Lophospiridae
Worthenia sp. de Koninck 1883 snail
 Euomphalina - Euomphalidae
Straparollus sp. de Montfort 1810 snail
 Prosobranchia - Meekospiridae
Meekospira sp. Ulrich and Scofield 1897 snail
 Prosobranchia - Goniasmatidae
"Taosia sp." = Stegocoelia (Taosia)
"Taosia sp." = Stegocoelia (Taosia) Girty 1939 snail
 Archaeogastropoda -
Archaeogastropoda indet. Thiele 1925 snail
Pleurotomariaceans
 Bellerophontida - Euphemitidae
Euphemites sp. Warthin 1930 snail
 Neritoidea - Naticopsidae
 Murchisoniina - Gosseletinidae
 Pleurotomariida - Portlockiellidae
Shansiella cf. beckwithana McChesney 1859 snail
 Pleurotomariida - Phymatopleuridae
Baylea sp. de Koninck 1881 snail
Stenolaemata
 Fenestrida - Polyporidae
 Trepostomata -
Trepostomata indet. Ulrich 1882
Incrusting Stenoporoid
Scyphozoa
 Conulariida - Conulariidae