Where: Japan (39.0° N, 141.5° E: paleocoordinates 23.9° N, 114.1° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Hoso-o Formation, Wordian (266.9 - 264.3 Ma)

• Upper part of the Hosoo Formation

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified mudstone

Size class: macrofossils

Primary reference: M. Ehiro and A. Misaki. 2005. Middle Permian ammonoids from the Kamiyasse-Imo district in the southern Kitakami Massif, northeast Japan. Paleontological Research 9(1):1-14 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 107611: authorized by Matthew Clapham, entered by Matthew Clapham on 11.04.2011

Creative Commons license: CC BY (attribution)