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Isurus planus (Agassiz, 1856)

Isurus planus (Agassiz, 1856)
Age : Miocene 12 milion years old.
Location : Shark tooth Hill, Temblor Formation, Bakersfield, California.

Size : 41 x 25 mm.
Upper lateral tooth

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Amazing specimen of Isurus planus tooth that come from Miocene sands of Bakersfield, California. The box (TR013) with felt is included with the tooth.

Isurus planus (Agassiz, 1856) is a distinct species of shark that lived only in the Pacific Ocean during the Oligocene and Miocene epoc. The first report of I. planus comes from the late Oligocene of Australia (Kemp, 1991). Exactly they come from Jan Juc Marl near Bird Rock. The remains of the teeth are most commonly found in the Miocene sediments in the American Pacific area from Mexico to California. They are found more rarely in Australia and Japan. A lateral tooth of I. planus was found during an excavation campaign in 2013 in a late Miocene deposit in the south-western part of the island of Sakhalin in Russia, on a cliff in the Tatar Strait (Nazarkin, 2013). As previously reported, the fossil remains of I. planus are most commonly found at Shark Tooth Hill, on the hills north-east of Bakersfield, California. In this part of California the geological area has been intensively studied and documented as part of the explorative development of oil resources. The fossil remains have traced the entire area to the late Miocene to middle Miocene. I. planus's teeth look very similar to I. hastalis's teeth. The lower teeth are practically indistinguishable from the lower teeth of I. hastalis, while the upper teeth have a very similar line. The apexes of the tooth roots are round and the crown is considerably tilted distally. These characteristics differ from I. planus to I. hastalis which possesses the apices of the square root and the straight crown.

Reference of the original description

AGASSIZ, L. (1856) Notice on the fossil fishes found in California by W.P. BLAKE. American Journal of Science and Arts, Series 2, 21: 272–275

Synonyms :  Oxyrhina plana

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Specific References