USNM806d, Cerros de los Monos, El Antimonio, Sonora (Permian of Mexico)

Where: Sonora, Mexico (30.8° N, 112.6° W: paleocoordinates 11.7° N, 40.3° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Antimonio Formation, Wordian (268.8 - 265.1 Ma)

• "Monos Beds"; Upper part of Spiriferellina Zone (uppermost zone in succession)

Environment/lithology: marine; blue, cherty/siliceous limestone

• Purer, bluish limestone with abundant dark brown nodular masses of chert

Size class: macrofossils

Preservation: replaced with silica

Primary reference: G. A. Cooper, C.O. Dunbar, H. Duncan, A.K. Miller, and J.B. Knight. 1953. Permian fauna at El Antimonio, western Sonora, Mexico. Smithsonian Miscellaneous Collections 119(2):1-111 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 40812: authorized by David Bottjer, entered by Matthew Clapham on 01.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Bellerophontida - Euphemitidae
Stachella sp., "Euphemites subpapillosus" = Euphemitopsis subpapillosa
Stachella sp. Waagen 1880 snail
"Euphemites subpapillosus" = Euphemitopsis subpapillosa White 1876 snail
 Pleurotomarioidea - Pleurotomariidae
? Pleurotomaria "sp. C" Defrance 1826 snail
Scaphopoda
 Dentaliida - Dentaliidae
Plagioglypta sp. Pilsbry 1898 tusk shell
Strophomenata
 Productida - Echinoconchidae
"Waagenoconcha montpelierensis" = Bathymyonia nevadensis
"Waagenoconcha montpelierensis" = Bathymyonia nevadensis Meek 1877
 Productida - Productellidae
Liosotella sp. Cooper 1953
Liosotella subrugosa n. sp. Cooper 1953
 Productida - Productidae
 Productida - Chonetidae
"Chonetes" monosensis n. sp. Cooper 1953
Rhynchonellata
 Athyridida - Neoretziidae
Hustedia sp. Hall and Clarke 1893
Hustedia elongata n. sp. Cooper 1953
 Spiriferinida - Reticulariinidae
"Spiriferellina sonorensis" = Reticulariina sonorensis
"Spiriferellina sonorensis" = Reticulariina sonorensis Cooper 1953
 Rhynchonellida - Wellerellidae
Wellerella lemasi Cooper 1953
Subspecies "minor"
unclassified
  -
Porifera indet. Grant 1836