Nio River (Mesodermochelys locality) (Cretaceous of Japan)

Where: Nakagawa, Japan (44.7° N, 141.8° E: paleocoordinates 49.4° N, 130.3° E)

• coordinate estimated from map

• hand sample-level geographic resolution

When: Osoushinai Formation (Yezo Group), Campanian (83.6 - 72.1 Ma)

Environment/lithology: marine; gray mudstone and sandstone

• The Osoushinai Formation is [...] most likely formed in the outer shelf to the upper continental slope setting
• The Osoushinai Formation is composed of grey to dark grey siltstone with intercalations of sandstone

Size class: macrofossils

Collected by Fujiyuki Endo in 2001

Collection methods: surface (in situ),

• NMV, Nakagawa Museum of Natural History Vertebrate collections, Nakagawa Town, Hokkaido, Japan

Primary reference: R. G. Jenkins, A. Kaim, K. Sato, K. Moriya, Y. Hikida and R. Hirayama. 2017. Discovery of chemosynthesis-based association on the Cretaceous basal leatherback sea turtle from Japan. Acta Palaeontologica Polonica 62 [E. Vlachos/E. Vlachos]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 188484: authorized by Evangelos Vlachos, entered by Evangelos Vlachos on 05.09.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Hikidea cf. yasukawensis
associated with the turtle
 Lucinida - Thyasiridae
Thyasira tanabei Kiel et al. 2008 clam
associated with the turtle
Gastropoda indet. Cuvier 1797 snail
associated with the turtle
 Prosobranchia - Provannidae
Provanna cf. nakagawensis snail
associated with the turtle
 Naticoidea - Naticidae
? Gyrodes sp. Conrad 1860 moon snail
associated with the turtle
 Testudines - Dermochelyidae
Mesodermochelys sp. Hirayama and Chitoku 1996 leatherback
NMV 50, partial carapace