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
Mammalia | |
Pinnipedia indet. pinniped | |
Allodesminae indet. Kellogg 1931 pinniped | |
Odobenidae indet. Allen 1880 walrus | |
Cetacea indet. Brisson 1762 whale | |
Desmostylus sp. Marsh 1888 desmostylian | |
Paleoparadoxia sp. Reinhart 1959 desmostylian | |
Chondrichthyes | |
"Carcharodon megalodon" = Otodus megalodon
"Carcharodon megalodon" = Otodus megalodon Agassiz 1835 megalodon | |
"Isurus hastalis" = Carcharodon hastalis
"Isurus hastalis" = Carcharodon hastalis Agassiz 1838 white shark |