Akan-cho (Miocene of Japan)

Where: Hokkaido, Japan (43.2° N, 144.0° E: paleocoordinates 43.8° N, 142.3° E)

• coordinate estimated from map

When: Tonokita Formation, Langhian (16.0 - 13.8 Ma)

• 15.9 - 14.9 Ma. Age after Matsui and Kawabe (2015)

• formation-level stratigraphic resolution

Environment/lithology: marine; mudstone

Size class: macrofossils

Primary reference: M. Kimura, M. Yahata, H. Sawamura, I. Segawa, A. Suzuki and Y. Muraishi. 1998. The vertebrate fossils and their horizon from Akan-cho, eastern Hokkaido, Japan. Earth Science (Chikyu Kagaku) 52:44-50 [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 55652: authorized by Mark Uhen, entered by Mark Uhen on 02.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Atsunai-Togeshita fauna
Chondrichthyes
 Lamniformes - Otodontidae
"Carcharodon megalodon" = Otodus megalodon
"Carcharodon megalodon" = Otodus megalodon Agassiz 1843 megalodon
 Lamniformes - Lamnidae
"Isurus hastalis" = Carcharodon hastalis
"Isurus hastalis" = Carcharodon hastalis Agassiz 1843 white shark
Mammalia
 Perissodactyla - Desmostylidae
Desmostylus sp. Marsh 1888 desmostylian
 Perissodactyla - Paleoparadoxiidae
Paleoparadoxia sp. Reinhart 1959 desmostylian
 Cetacea -