Abstract
A total of 13 species distributed among 8 genera of fossil shark teeth are systematically described from the Middle Miocene and the Upper Pliocene marine sediments, at the Sakiyama area of Nanao City, in the Noto Peninsula, Japan. Newly found fossil teeth in the Middle Miocene glauconitic sandstone consist of Dalatias licha, Carcharias acutissima, Carcharias cuspidate, Isurus desori, Isurus hastalis, Isurus planus, Carcharocles megalodon, Parotodus benedeni, Carcharhinus spp.. The Carcharodon carcharias, Isurus hastalis, Carcharhinus cf. egertoni, Carcharhinus spp. and Sphrna sp. were found in the Upper Pliocene siltstone. These species inhabited through tropical or temperate climates at neritic or epipelagic areas. This is the first report to indicate that Isurus hastalis might have survived during Pliocene, although it was referred to be extinct in Late Miocene.
https://ror.org/02hwp6a56 
