Bottomless Pits Dictyoclostus Faunule (MNA): Roadian, Arizona
collected 1942

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Proetida - Phillipsiidae
Anisopyge sp. Girty 1908
1 specimen
Scaphopoda - Dentaliida - Dentaliidae
Plagioglypta sp. Pilsbry 1898
9 specimens
Gastropoda - Naticopsidae
Naticopsis sp. M'Coy 1844
2 specimens
Gastropoda - Euomphalina - Euomphalidae
Euomphalus sp. Sowerby 1814
2 specimens
Gastropoda - Bellerophontida - Bellerophontidae
Bellerophon sp. de Montfort 1808
12 specimens
Gastropoda - Bellerophontida - Euphemitidae
Euphemites sp. Warthin 1930
23 specimens
Gastropoda - Murchisoniina - Murchisoniidae
"Murchisonia" sp. d'Archiac and de Verneuil 1841
18 specimens
Gastropoda - Murchisoniina - Gosseletinidae
Baylea sp. de Koninck 1881
3 specimens
Bivalvia - Pectinida - Aviculopectinidae
Aviculopecten sp. M'Coy 1851
3 specimens
Bivalvia - Ostreida - Pterineidae
Dozierella sp. Newell 1940
6 specimens
Bivalvia - Myalinida - Myalinidae
Myalina sp. de Koninck 1842
2 specimens
Bivalvia - Arcida - Parallelodontidae
Parallelodon sp. Meek and Worthen 1866
12 specimens
Bivalvia - Pholadomyida - Edmondiidae
"Allorisma" sp. King 1844
1 specimen
Edmondia sp. de Koninck 1841
5 specimens
Bivalvia - Cardiida - Kalenteridae
Pleurophorus sp. King 1844
9 specimens
Bivalvia - Carditida - Astartidae
Astartella sp. Hall 1858
7 specimens
Bivalvia - Trigoniida - Schizodidae
Schizodus sp. King 1844
1 specimen
Bivalvia - Nuculida - Nuculidae
Nuculopsis sp. Girty 1912
14 specimens
Bivalvia - Nuculanida - Nuculanidae
"Nuculana" sp. Link 1807
4 specimens
Strophomenata - Productida - Productidae
"Dictyoclostus" sp. Muir-Wood 1930
11 specimens
Strophomenata - Productida
"Marginifera" sp. Waagen 1884
7 specimens
unclassified
Annelida indet. Lamarck 1809
1 specimen
"worm tubes on specimen of Marginifera"
see common names

Geography
Country:United States State/province:Arizona County:Coconino
Coordinates: 35.2° North, 111.6° West (view map)
Paleocoordinates:9.2° North, 36.6° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period: Permian Epoch: Guadalupian
Stage: Roadian 10 m.y. bin: Permian 3
Key time interval: Roadian
Age range of interval: 273.01 - 266.9 m.y. ago
Stratigraphy
Formation:Kaibab Member:Alpha
Stratigraphic resolution:group of beds
Stratigraphy comments: "facies 3 of the Alpha member, the upper 130 feet, of the Kaibab Formation... fossiliferous beds are not as a rule more than 5 feet thick... about 100 feet below base of Moenkopi formation"
said only to be Permian; Roadian age based on Chronic (1952)
Lithology and environment
Primary lithology:fine,hematitic,gray silty dolomite
Lithology description: "fine-grained, grey dolomite with red and brown iron oxide strains, containing less fine detrital grains than Plagioglypta zonule... silt 4.70 percent"
Environment:lagoonal/restricted shallow subtidal
Geology comments: "shallow water... not brackish water [but] not typically marine... may have been hypersaline"
Taphonomy
Modes of preservation:cast
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:species names
Collection methods:field collection
Reason for describing collection:paleoecologic analysis
Collection dates:August and September 1942
Collection method comments: Museum of Northern Arizona collection
Taxonomic list comments:not the same as later collections of Chronic (1952) from the same area
Metadata
Database number:80923
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:M. Clapham Research group:marine invertebrate
Created:2008-05-21 18:06:02 Last modified:2013-08-31 16:57:54
Access level:the public Released:2008-05-21 18:06:02
Creative Commons license:CC BY
Reference information

Primary reference:
27231. D. Nicol. 1944. Paleoecology of three faunules in the Permian Kaibab Formation at Flagstaff, Arizona. Journal of Paleontology 18(6):553-557 [J. Alroy/J. Alroy]