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Haratashino Formation
Miocene, Tomioka Group, Annaka-shi, Gunma Prefecture, Japan
ver. 2.3
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There is a localitiy on the riverbank of the Usui River running through
Gunma Prefecture. This locality produces beautiful shark teeth such as
Megalodon and hastalis. A lot of pretty small shark teeth were found at
a narrow area, about several meters wide and ten meters in length of the
river bank. Most of them were deep sea sharks. Squaloids were dominant
among them and found to be consist of four genera. Etomopterus was the
most abundunt species among them. The locality also yields a vareity of
dermal denticles accompanied with shark teeth. |
Chlamydoselachus cfr.anguineus, |
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ver. 2.3 20110428 (ver. 1.0 20000615 Tukahara F. )
Fumio Nakagawa
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