Futaba Area, Ashizawa Formation, Honshu (Cretaceous of Japan)

Where: Fukushima, Japan (37.7° N, 141.0° E: paleocoordinates 50.0° N, 131.6° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Ashizawa Formation (Futaba Group), Early/Lower Coniacian (89.3 - 85.8 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine

Size class: macrofossils

Preservation: cast, mold/impression

Primary reference: I. Hayami. 1975. A systematic survey of the Mesozoic Bivalvia from Japan. The University Museum, The University of Tokyo, Bulletin (10) [M. Aberhan/S. Nurnberg/S. Nurnberg]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39626: authorized by Martin Aberhan, entered by Sabine N├╝rnberg on 01.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Arcida - Glycymerididae
 Arcida - Parallelodontidae
Grammatodon (Nanonavis) sachalinensis clam
subsp. sachalinensis
 Myalinida - Inoceramidae
"Inoceramus (Inoceramus) uwajimensis" = Mytiloides stantoni
"Inoceramus (Inoceramus) uwajimensis" = Mytiloides stantoni Sokolow 1914 clam
 Pectinida - Limidae
Limatula sp. Wood 1839 file clam
 Ostreida - Posidoniidae
 Carditida - Astartidae
Opis (Opis) sp. Defrance 1824 clam
 Lucinida - Lucinidae
Myrtea ezoensis Nagao 1957 clam
 Trigoniida - Megatrigonioidae
 Nuculida - Nuculidae
Acila (Truncacila) hokkaidoensis Nagao 1932 divaricate nutclam
 Protobranchia - Nuculanidae
Jupiteria (Ezonuculana) mactraeformis Nagao 1932 pointed nut clam