Where: Japan (43.1° N, 143.8° E: paleocoordinates 43.7° N, 142.2° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Ishiizawa Sandstone Member (Atsunai Formation), Middle Miocene (16.0 - 11.6 Ma)
• STRATIGRAPHIC RELATIONS: From Atsunai Fm, which overlies the Tokomuro Fm (Early Miocene) of the Atsunai Gp, and is overlain by the Shiranuka Fm (Late Miocene-Pliocene). THICKNESS: From bed with formation that attains a thickness of 700 m. AGE: Middle Miocene on the basis of molluscan biostratigraphy; Kawabata stage. STRATIGRAPHIC POSITION: From member at the base of the Atsunai Fm.
• bed-level stratigraphic resolution
Environment/lithology: transition zone or lower shoreface; lithified, medium-grained, ferruginous sandstone
Size class: macrofossils
Collection methods: COLLECTOR: Y. Honda. REPOSITORY: Institute of Geology and Paleontology, Tohoku University, Sendai, Japan (IGPS).
Primary reference: Y. Honda. 1988. Molluscan fossils from the Atsunai Group, Kushiro Coal Field, Eastern Hokkaido, Northern Japan. Sato Ho-on Kai Special Publication (Profesoor T. Kotaka Commemorartive Volume) 351-363 [A. Hendy/A. Hendy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 70399: authorized by Austin Hendy, entered by Austin Hendy on 21.03.2007
Creative Commons license: CC BY (attribution)
Taxonomic list
Scaphopoda | |
Dentalium sp. Linnaeus 1758 tusk shell | |
Bivalvia | |
Anadara (Anadara) hokkaidoensis Noda 1966 ark | |
"Glycymeris (Glycymeris) idensis" = Glycymeris idensis
"Glycymeris (Glycymeris) idensis" = Glycymeris idensis Kanno 1956 clam | |
Mizuhopecten nakatombetsuensis Akiyama 1962 scallop | |
Macoma (Macoma) tokyoensis tellin clam | |
Laevicardium angustum cockle | |
Mercenaria yiizukai quahog | |
Gastropoda | |
Euspira sp. Agassiz 1837 moon snail
Tectonatica sp. Sacco 1890 moon snail | |
Turritella sp. Lamarck 1799 turret shell
Mesalia sp. Gray 1847 turret shell | |
Homalopoma sp. Carpenter 1864 snail |