Separation Canyon, USGS 25139-PC: Morrowan, Arizona

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Chondrichthyes - Cochliodontiformes - Cochliodontidae
Deltodus sp. Morris and Roberts 1862
Dentition
unclassified
Pelmatozoa indet. Leuckart 1848
Debris
Echinoidea
Echinoidea indet. (Leske 1778)
Spines
Bivalvia - Nuculida - Nuculidae
Nuculopsis sp. Girty 1912
Bivalvia - Cardiida - Kalenteridae
Permophorus sp. Chavan 1954
Bivalvia - Mytilida - Mytilidae
Promytilus sp. Newell 1942
Bivalvia - Pectinida - Aviculopectinidae
Aviculopecten gravidus
Aviculopecten sp. M'Coy 1851
Bivalvia - Ostreida - Pterineidae
Leptodesma sp. Hall 1883
Bivalvia - Myalinida - Myalinidae
Septimyalina sp. Newell 1942
Rostroconchia - Conocardiida - Bransoniidae
Pseudoconocardium sp. Zavodowsky 1960
Gastropoda - Euomphalina - Microdomatidae
Microdoma sp. Meek and Worthen 1867
Gastropoda - Euomphalina - Euomphalidae
Straparollus sp. de Montfort 1810
Gastropoda - Murchisoniina - Gosseletinidae
Baylea sp. de Koninck 1881
Gastropoda - Murchisoniina - Eotomariidae
Euconospira sp. Ulrich and Scofield 1897
Gastropoda - Bellerophontida - Bellerophontidae
Bellerophontidae indet. M'Coy 1851
Rhynchonellata - Spiriferida - Spiriferidae
Anthracospirifer tanoensis
Rhynchonellata - Athyridida - Athyrididae
Composita gibbosa
Trilobita
Trilobita indet. Walch 1771
Hypostome
see common names

Geography
Country:United States State/province:Arizona
Coordinates: 35.8° North, 113.6° West (view map)
Paleocoordinates:1.2° North, 44.0° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Carboniferous Epoch:Pennsylvanian
Stage:Bashkirian 10 m.y. bin:Carboniferous 4
Key time interval:Morrowan
Age range of interval:323.20000 - 318.40000 m.y. ago
Stratigraphy
Geological group:Supai Formation:Watahomigi
Local section:Separation Canyon
Regional section:Grand Canyon
Stratigraphic resolution:group of beds
Stratigraphy comments: The Watahomigi is comprised of three informal units: a lower slope unit, a middle cliff unit, and an upper slope unit.
Lithology and environment
Primary lithology:gray lithified conglomeratic "limestone"
Secondary lithology:red or brown lithified conglomeratic sandstone
Includes fossils?Y
Lithology description: 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.
Environment:shallow subtidal indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Museum repositories:USGS
Metadata
Also known as:Separation Canyon, collection 7 ft above base of formation
Database number:42700
Authorizer:J. Alroy Enterer:C. Simpson
Modifier:C. Simpson Research group:marine invertebrate
Created:2004-08-04 12:38:57 Last modified:2004-08-04 15:38:57
Access level:the public Released:2004-08-04 12:38:57
Creative Commons license:CC BY
Reference information

Primary reference:
11207. E. D. McKee. 1982. The Supai Group of the Grand Canyon. United States Geological Survey Professional Paper 1173 [J. Alroy/C. Simpson/C. Simpson]