Family Hemigaleidae (Snaggletooth or Weasel Sharks)
Hemipristis serra has a very ornate serrated cusp that is unmistakable
and is 1/4" to 2" long. H. curvatus is the Eocene species that has fewer
serrations and is smaller in size. Some report this species here, but I
Have never found one.
Family Triakidae (Houndsharks)
While I have never found any, others claim Triakis species teeth have been found here. They would be small teeth with cusplets and a wrinkled central cusp.
Order Lamniformes Broad toothed sharks that were the most common prior to the Miocene epoch.
Family Otodontidae (White Sharks)
Carcharocles megalodon was the largest and most impressive of the extinct sharks. The teeth found here range from 1" to 3" long, and are fairly rare intact. We find many fragments that are almost as impressive. The large triangular finely serrated teeth are unmistakable
C. angustidens is an Oligocene species with small cusplets has also been reported here, though I have never found one; as well as C. chubetensis a Miocene species with smaller cusplets.
Isurus species (Mako sharks) teeth range from 1/4" to 2" long. Intact teeth are more common than other large sharks here and are found worldwide.
I. hastalis has a large smooth triangular cusp that ranges in size from 1 to 3 inches. Very similar is I. desori which differs in having a more narrow curved cusp. I. praecursor is an Eocene species with very narrow cusps.
Family Alopidae (Thresher Sharks)
Alopias latidens teeth are very rare here, I have only found a single example.
Order Orectolobiformes (Carpet Sharks)
Family Ginglymostomatidae (Nurse Sharks) Only recently have we found this genus using a very fine screen, and are very rarely found intact. But their distinct shape can make them hard to mistake for other micro species.
Ginglymostoma delfortriei and G. leherni are usually smaller than 1/8" and have a rounded cusp with multiple serrations.
Family Hexanchidae (Cow Sharks)
Perhaps one of the rarest finds here are the spectacular teeth of Notorhynchus primegenius. With their multiple cusps they are quite complex, unfortunately I have only found a few incomplete examples due to the delicate root structure.
If you are really hardcore about exact identification of shark teeth spend a few hours with Robert W. Purdy's Key to Common Genera of Neogene Shark Teeth .
Most illustrations reproduced with the permission of Jim Bourdon, copyright 1996-2002.
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Fossil Teeth, Vertebrae and Coprolites of Neoselachians