Akasaka (Asato collection) (Permian of Japan)

Where: Japan (35.4° N, 136.6° E: paleocoordinates 19.7° N, 107.3° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Cancellina nipponica foram zone, Akasaka Formation, Roadian (272.3 - 268.8 Ma)

• Lower Member. Probably from the third Shikamaia bed (as recognized by Kobayashi 2011) from the bottom of the Cancellina nipponica zone.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, gray packstone

• Light gray wackestone/packstone

Size class: macrofossils

Collected by K. Asato in 2015, 2016

• Repository: National Museum of Nature and Science, Tsukuba

Primary reference: K. Asato, T. Kase, T. Ono, K. Sashida, and S. Agematsu. 2017. Morphology, systematics and paleoecology of Shikamaia, aberrant Permian bivalves (Alatoconchidae: Ambonychioidea) from Japan. Paleontological Research 21:358-379 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 189291: authorized by Matthew Clapham, entered by Matthew Clapham on 09.10.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Myalinida - Alatoconchidae
Shikamaia akasakaensis Ozaki 1968 clam