Matsukura Industry Co., Ltd. Stone Quarry (Miocene to of Japan)

Where: Chiba, Japan (35.2° N, 139.9° E: paleocoordinates 36.0° N, 138.9° E)

• coordinate stated in text

When: Senhata Formation, Messinian to Messinian (7.2 - 3.6 Ma)

• Age after Boessenecker et al., 2019.

Environment/lithology: marine; coarse-grained, gray, green sandstone

Size class: macrofossils

Primary reference: N. Kohno. 1992. A new Pliocene fur seal (Carnivora: Otariidae) from the Senhata Formation on the Boso Peninsula, Japan. Natural History Research 2(1):15-28 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 70006: authorized by Mark Uhen, entered by Mark Uhen on 14.03.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Squaliformes - Dalatiidae
Isistius sp.2 Gill 1864 elasmobranch
 Squatiniformes - Squatinidae
Squatina sp.2 Dumeril 1806 angel shark
 Odontaspidida - Carcharodontidae
"Isurus hastalis" = Cosmopolitodus hastalis2
"Isurus hastalis" = Cosmopolitodus hastalis2 Agassiz 1843 elasmobranch
 Plagiostomi - Squalidae
Dalatias licha2 Bonnaterre 1788 dogfish shark
 Lamniformes - Otodontidae
Parotodus benedeni2, "Carcharocles megalodon" = Otodus megalodon2
Parotodus benedeni2 Le Hon 1871 mackerel shark
"Carcharocles megalodon" = Otodus megalodon2 Agassiz 1843 megalodon
 Lamniformes - Lamnidae
Isurus oxyrinchus2 Rafinesque 1810 mako shark
Carcharodon carcharias2 Linnaeus 1758 great white shark
 Lamniformes - Odontaspididae
Carcharias sp.2 Rafinesque 1810 sand shark
 Carchariniformes - Carcharhinidae
Carcharhinus sp.2 de Blainville 1816 requiem shark
A, B, D, D, E
 Carchariniformes - Sphyrnidae
Sphyrna zygaena2 Linnaeus 1758 hammerhead shark
 Carchariniformes - Triakidae
Galeorhinus sp.2 de Blainville and Prévost 1816 school shark
 Pristiophoriformes - Pristiophoridae
Pristiophorus lanceolatus2 Davis 1888 saw shark
Mammalia
 Carnivora - Otariidae
Thalassoleon inouei n. sp. Kohno 1992 eared seal
 Cetacea - Pontoporiidae
Pontoporiidae indet.1 Gray 1870 toothed whale