Where: Japan (39.7° N, 140.1° E: paleocoordinates 42.4° N, 137.5° E)
• outcrop-level geographic resolution
When: Nishikurosawa Formation, Middle Miocene (16.0 - 11.6 Ma)
• STRATIGRAPHIC RELATIONS: From Nishikurosawa Fm, which rests unconformably above the Daikima Flora of the Daijima Formation (Middle Miocene), and conformably below the Onnagawa Fm (Middle Miocene). THICKNESS: From restricted bed within formation of 20-100 m total thickness. AGE: Middle Miocene on the basis of molluscan biostratigraphy. STRATIGRAPHIC POSITION: From bed within lower part of the Nishikurosawa Fm.
• bed-level stratigraphic resolution
Environment/lithology: coastal; lithified, pebbly, silty, sandy, carbonaceous conglomerate
Size class: macrofossils
Preservation: cast, mold/impression
Collection methods: surface (in situ),
• COLLECTOR: K. Ogasawara. REPOSITORY: IGPS, Institute of Geology and Paleontology, Tohoku University.
Primary reference: K. Ogasawara. 1973. Molluscan fossils from the Nishikurosawa Formation, Oga Peninsula, Akita Prefecture, Japan. Tohoku University, Science Report, 2nd ser. (Geol.), Special Volume (Hatai Memorial Volume) 6:137-155 [A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 70302: authorized by Austin Hendy, entered by Austin Hendy on 20.03.2007
Creative Commons license: CC BY (attribution)
Taxonomic list
Scaphopoda | |
Dentalium sp. Linnaeus 1758 tusk shell | |
Bivalvia | |
Nuculana magarikawaensis pointed nut clam
Nuculana cf. confusa Hanley 1860 pointed nut clam
Saccella saikaiensis pointed nut clam
Saccella sp. Woodring 1925 pointed nut clam | |
Venericardia osawanoensis Tsuda 1959 clam | |
"Panopaea sp." = Panopea
"Panopaea sp." = Panopea Menard 1807 clam | |
Anisocorbula ohiroi Masuda 1966 clam | |
Teredo sp. Linnaeus 1758 clam | |
"Fabulina sp." = Tellina (Fabulina) tellin clam
Macoma aomoriensis tellin clam
Macoma cf. tokyoensis tellin clam | |
"Vasticardium ogurai" = Acrosterigma (Vasticardium), Nemocardium samarangae, "Clinocardium shinjiense" = Ciliatocardium shinjiense, Clinocardium sp.
"Vasticardium ogurai" = Acrosterigma (Vasticardium) cockle
Nemocardium samarangae cockle
"Clinocardium shinjiense" = Ciliatocardium shinjiense Yokoyama 1923 cockle
Clinocardium sp. Keen 1936 cockle | |
Paphia cf. suzuensis, "Siratoria siratoriensis" = Tapes (Siratoria), Chione tateiwai, Dosinia nomurai, Leukoma itoigawae, Meretrix minohensis
Paphia cf. suzuensis venus clam
"Siratoria siratoriensis" = Tapes (Siratoria) venus clam
Chione tateiwai venus clam
Dosinia nomurai Otuka 1934 venus clam
Leukoma itoigawae venus clam
Meretrix minohensis venus clam | |
Diplodonta sp. Bronn 1831 clam | |
Gastropoda | |
Euspira meisensis Makiyama 1926 moon snail | |
Nassarius minoensis snail | |
Babylonia kozaiensis Nomura 1939 true whelk | |
Calyptraea sp. Lamarck 1799 slipper shell | |
Vicaryella sp. Yabe and Hatai 1938 horn snail
Vicaryella notoensis Masuda 1956 horn snail | |
Turritella sp. Lamarck 1799 turret shell | |
Cerithium sp. Bruguière 1789 cerith snail |