Nakakubo, Yanadani-mura, Kamiukena-gun, Ehime Prefecture (Permian of Japan)

Where: Japan (33.5° N, 133.0° E: paleocoordinates 14.5° N, 99.6° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Nakakubo Formation, Asselian (298.9 - 295.5 Ma)

• Presence of Pseudoschwagerina minatoi, Triticites aff. pusillus, Schwagerina stabilis, and Nankinella kawadai suggest Asselian age. Correlative zone also contains Rugosofusulina, Pseudofusulina, and Paraschwagerina.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, massive, shelly/skeletal, gray, white packstone

• Limestones are whitish gray and massive, and consist of bioclastic calcarenite, including abundant fusulinaceans and brachiopods, and small amounts of corals, crinoids, pelecypods, and gastropods.

Size class: macrofossils

Collected by M. Hirata

• Repository: Department of Geology, Faculty of Science, Kyushu University, Fukuoka (GK-D) and Kochi Prefectural Museum (MH)

Primary reference: J. Yanagida and M. Hirata. 1969. Lower Permian brachiopods from Nakakubo, west-central Shikoku, Japan. Transactions and Proceedings of the Paleontological Society of Japan, N.S. 73:89-111 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 136384: authorized by Matthew Clapham, entered by Matthew Clapham on 27.11.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Productida - Echinoconchidae
 Productida - Productellidae
? Marginifera sp. Waagen 1884
 Productida - Linoproductidae
 Productida - Rugosochonetidae
Neochonetes sp. Muir-Wood 1962
Rhynchonellata
 Terebratulida - Notothyrididae
Rostranteris sp., "Rostranteris cf. nucleolus" = Notothyris nucleolus
Rostranteris sp. Gemmellaro 1899
"Rostranteris cf. nucleolus" = Notothyris nucleolus Kutorga 1842
 Spiriferinida - Paraspiriferinidae
 Spiriferida - Trigonotretidae
Neospirifer cf. fasciger Keyserling 1846
 Spiriferida - Choristitidae
Tangshanella nakakuboensis n. sp. Yanagida and Hirata 1969
 Spiriferida - Elythidae
 Rhynchonellida - Wellerellidae
Uncinunellina shikokuensis n. sp. Yanagida and Hirata 1969
 Orthida - Enteletidae
Enteletes gibbosus Chronic 1949