Katsura, Kochi Prefecture (Permian of Japan)

Where: Japan (33.5° N, 133.3° E: paleocoordinates 30.6° N, 109.1° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Katsura Formation, Changhsingian (254.2 - 252.2 Ma)

• Upper part of formation. Katsura Formation is correlated with similar Toyoma and Gujo Formations, although the age assignment is uncertain because it lacks biostratigraphically useful fossils.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, coarse-grained, pebbly, muddy sandstone

Size class: macrofossils

Preservation: mold/impression

Primary reference: K. Nakazawa and N.D. Newell. 1968. Permian bivalves of Japan. Memoirs of the Faculty of Science, Kyoto University, Series of Geology and Mineralogy 35(1):1-108 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 114489: authorized by Matthew Clapham, entered by Matthew Clapham on 15.08.2011, edited by Bethany Allen

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Nuculanida - Cucullellidae
Nuculites ichikawai n. sp.
Nuculites ichikawai n. sp. Nakazawa and Newell 1968 clam
 Nuculida - Nuculidae
Nuculopsis (Nuculopsis) orientalis n. sp.1, "Nuculopsis (Nuculanella) sp." = Nuculanella1
Nuculopsis (Nuculopsis) orientalis n. sp.1 Ichikawa 1951 nut clam
UMUT PM5311 (holotype)
"Nuculopsis (Nuculanella) sp." = Nuculanella1 Tasch 1953 nut clam
 Trigoniida - Myophoriidae
Neoschizodus kobayashii n. sp.1, Costatoria katsurensis2
Neoschizodus kobayashii n. sp.1 Ichikawa 1951 clam
Costatoria katsurensis2 Nakazawa 1967 clam
 Unionida - Actinodontophoridae
Actinodontophora katsurensis n. sp.1
Actinodontophora katsurensis n. sp.1 Ichikawa 1951 clam
UMUT PM5306 (holotype)
1Hayami and Kase 1977; 2Newell and Boyd 1975