AMNH301, Bed 56b, 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)

• 45 feet thick, fusilines and Omphalotrochus at 30 ft, brachiopods at 35 ft (56b?).

• group of beds-level stratigraphic resolution

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

• Limestone, even-bedded.

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 41376: authorized by David Bottjer, entered by Matthew Clapham on 13.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Myalinida - Myalinidae
Septimyalina cf. burmai Newell 1942 clam
 Pholadomyida - Edmondiidae
Edmondia sp. de Koninck 1841 clam
 Trochonematoidea - Trochonematidae
Trochonematidae indet. von Zittel 1895 snail
 Euomphalina - Anomphalidae
Anomphalus sp. Meek and Worthen 1866 snail
 Prosobranchia - Goniasmatidae
Goniasma "sp. 1" Tomlin 1930 snail
 Prosobranchia - Pseudozygopleuridae
Pseudozygopleura spp. Knight 1930 snail
 Murchisoniina - Gosseletinidae
Euconospira sp. Ulrich and Scofield 1897 snail
Crinoidea indet. Miller 1821 Sea lily
Stems and rare plates
 Athyridida - Athyrididae
Composita subtilita Hall 1852
n. ssp. peruviana
 Terebratulida - Dielasmatidae
Dielasma scitulum Chronic 1949
 Spiriferinida - Reticulariinidae
 Orthida - Enteletidae
Enteletes gibbosus n. sp. Chronic 1949