USNM806f, 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"; Spiriferellina Zone is uppermost in the 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 40815: authorized by David Bottjer, entered by Matthew Clapham on 01.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Myalinida - Myalinidae
Myalina sp. de Koninck 1842 clam
 Pectinida -
Pectinoidea indet. Rafinesque 1815 scallop
 Nuculida - Nuculidae
"Nucula" sp. Lamarck 1799 nut clam
Gastropoda
 Euomphalina - Euomphalidae
? Straparollus "sp. A" de Montfort 1810 snail
Strophomenata
 Productida - Strophalosiidae
Heteralosia mexicana n. sp. Cooper 1953
 Productida - Echinoconchidae
"Waagenoconcha montpelierensis" = Bathymyonia nevadensis
"Waagenoconcha montpelierensis" = Bathymyonia nevadensis Meek 1877
 Productida - Productellidae
 Productida - Productidae
 Productida - Chonetidae
"Chonetes" sp. Fischer de Waldheim 1830
"Chonetes" monosensis Cooper 1953
Rhynchonellata
 Athyridida - Neoretziidae
Hustedia shumardi Torres-Martínez et al. 2016
 Athyridida - Athyrididae
Composita grandis Cooper 1953
 Terebratulida - Cryptonellidae
Heterelasma contrerasi n. sp. Cooper 1953
 Terebratulida - Notothyrididae
 Terebratulida - Dielasmatidae
Dielasma floresi Cooper 1953
 Spiriferinida - Reticulariinidae
"Spiriferellina sonorensis" = Reticulariina sonorensis
"Spiriferellina sonorensis" = Reticulariina sonorensis Cooper 1953
 Rhynchonellida - Wellerellidae
Wellerella lemasi Cooper 1953
Subspecies "minor"
 Rhynchonellida - Rhynchoporidae
Rhynchopora taylori Girty 1910
New subspecies "rotundata"
Lingulata
 Lingulida - Disciniidae
Orbiculoidea "sp. 1" d'Orbigny 1847
Anthozoa
 Stauriida - Lophophyllidiidae
Lophophyllidium sp. Grabau 1928 horn coral