AMNH301, Bed 36b, Rasuvilca Hills section 9, Pajege Canyon (Permian to of Peru)

Where: Ayacucho, Peru (12.8° S, 74.2° W: paleocoordinates 26.7° S, 50.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Copacabana Group, Asselian to Asselian (298.9 - 290.1 Ma)

• 540 feet thick, productids at 80 ft, gastropods at 295 ft, fusilines at 515 ft.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, shelly/skeletal, gray, blue limestone

• Limestone, blue-gray.

Size class: macrofossils

Preservation: replaced with silica

Collection methods: bulk, chemical,

Primary reference: N. D. Newell, J. Chronic, and T.G. Roberts. 1953. Upper Paleozoic of Peru. Geological Society of America Memoir 58:1-276 [D. Bottjer/M. Clapham/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 41369: authorized by David Bottjer, entered by Matthew Clapham on 13.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Protobranchia - Nuculanidae
Polidevcia sp. Tschernyschev 1943 pointed nut clam
Juveniles
Gastropoda
 Cyrtoneritimorpha - Orthonychiidae
Orthonychia pajerensis Chronic 1949 snail
 Murchisoniina - Gosseletinidae
Peruvispira delicata n. gen. Chronic 1949 snail
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
Stems and rare plates
Rhynchonellata
 Athyridida - Athyrididae
Composita subtilita Hall 1852
n. ssp. peruviana
 Spiriferida - Trigonotretidae
"Neospirifer condor" = Gypospirifer condor
"Neospirifer condor" = Gypospirifer condor d'Orbigny 1842