Bottomless Pits, Bed 2, Kaibab Formation, Walnut Canyon (Permian of the United States)

Where: Coconino County, Arizona (35.2° N, 111.6° W: paleocoordinates 9.2° N, 36.6° W)

• coordinate estimated from map

• local area-level geographic resolution

When: "Alpha" Member (Kaibab Formation), Roadian (272.3 - 268.8 Ma)

• Bed is 4.5 feet thick; forms irregular slope or cliff

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; dolomitic, shelly/skeletal, yellow, silty limestone

• Limestone: yellowish-brown to reddish-brown, dolomitic, slightly silty, very fossiliferous, weathers light brownish-gray

Size class: macrofossils

Preservation: mold/impression

Primary reference: H. Chronic. 1952. Molluscan fauna from the Permian Kaibab Formation, Walnut Canyon, Arizona. Geological Society America Bulletin 63(2):95-166 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39998: authorized by David Bottjer, entered by Matthew Clapham on 13.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Arcida - Parallelodontidae
"Grammatodon politus" = Grammatodon (Cosmetodon) politus
"Grammatodon politus" = Grammatodon (Cosmetodon) politus Girty 1909 clam
 Pectinida - Aviculopectinidae
Aviculopecten kaibabensis Newell 1938 scallop
 Mytilida - Mytilidae
Promytilus retusus Chronic 1952 mussel
 Carditida - Astartidae
Astartella subquadrata Girty 1909 clam
 Cardiidia - Sanguinolitidae
"Allorisma terminale" = Wilkingia terminale
"Allorisma terminale" = Wilkingia terminale Hall 1852 clam
 Cardiida - Kalenteridae
"Pleurophorus albequus" = Permophorus albequus
"Pleurophorus albequus" = Permophorus albequus Beede 1907 clam
 Nuculida - Nuculidae
"Palaeonucula levatiformis" = Nuculavus levatiformis
"Palaeonucula levatiformis" = Nuculavus levatiformis Walcott 1884 nut clam
 Euomphalina - Euomphalidae
Euomphalus kaibabensis Chronic 1952 snail
 Prosobranchia - Goniasmatidae
Stegocoelia quadricostata n. sp. Chronic 1952 snail
 Bellerophontida - Bellerophontidae
Bellerophon deflectus Chronic 1952 snail
Retispira undulata Chronic 1952 snail
 Bellerophontida - Euphemitidae
Euphemites aequisulcatus Chronic 1952 snail
 Neritoidea - Naticopsidae
Naticopsis sp. M'Coy 1844 snail
 Murchisoniina - Gosseletinidae
? Mourlonia cancellata Chronic 1952 snail
Glabrocingulum laeviliratum Chronic 1952 snail
"Ananias gibber n. sp." = Glabrocingulum (Glabrocingulum) gibber Chronic 1952 snail
 Trochoidea -
Strianematina pulchrelirata n. gen. n. sp. Chronic 1952 snail
 Archinacellida - Metoptomatidae
cf. Lepetopsis sp. Whitfield 1882