An extinct shark Isurus hastalis has been widely found from various localities in the Miocene of Japan.
This page shows summarized production patterns of the species Isurus hastalis and Isurus planus from eight localities in the Cenozoic era of Japan. The production of
Isurus hastalis from all these localities is confirmed while Isurus planus is found from three localities in the Middle Miocene. Isurus hastalis is known as a species mainly from the Miocene however it is also found
from two localities in the Oligocene and the Pliocene of Japan. Occurrences
of Isurus planus have been reported from many localities in the middle Miocene of Japan. Among those localities, the Hokuriku group of Noto is well known. Here, I report on the production of the species from two other Middle Miocene localities. Abundant production of Isurus planus is also known from the Middle Miocene of Bakerfs Field (the STH fauna), U.S.A.
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