SK28, Imahorazawa (Permian of Japan)

Where: Japan (39.2° N, 141.6° E: paleocoordinates 17.9° N, 108.3° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Sakamotosawa Formation, Sakmarian (295.5 - 290.1 Ma)

• 20 m above the base of the Sakamotozawa Formation

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, medium-grained, brown, gray sandstone

• Gray to light-brown medium grained sandstone and light-gray coarse-grained sandstone

Size class: macrofossils

Preservation: mold/impression

Collection methods: Repository: Niigata University

Primary reference: T. Shintani. 2011. Orthotetoids from the Lower Permian (Sakmarian) of the Nagaiwa-Sakamotozawa area, South Kitakami Belt, northeast Japan. Science Reports, Niigata University (Geology) 26:73-90 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 138384: authorized by Matthew Clapham, entered by Matthew Clapham on 16.01.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Productida - Aulostegidae
Edriosteges cf. multispinosus Muir-Wood and Cooper 1960
 Productida - Linoproductidae
 Orthotetida - Derbyiidae
Derbyia dorsosulcata Liu and Waterhouse 1985
Derbyia crassa Meek and Hayden 1858
 Orthotetida - Meekellidae