Bill Heim

Did this come out of Zone-2? It looks like it.

Does the tip have a noticeable twist (looking down it). Due to the damage, it is difficult to tell if this is P. contortus or G. aduncus. Ignore that ^@## article saying contortus are lower teeth of aduncus. It is pure BS.

Round Mountain Silt member of the Temblor Formation, Kern County

Carcharodon carcharias – Great White Shark

Yes, Negaprion

It is Hemipristis. It is a contrasty image which washes out detail. You can use any number of image programs to decrease the contrast and/or brighten the image. Windows comes with some, as does Apple and most phones. You can also find free ones on the internet.

Common – Extinct Tiger-like Shark, Genus – Physogaleus, Specific Epithet – contortus

Genus – Carcharhinus, Specific Epithet – perezii (Caribbean Reef Shark)

Parens around the Author means that the genus was changed from the original. Agassiz probably originally described it as Squalus hastalis.

This is Carcharodon planus. Related to the Great White shark (a dead end off branch).

This is Physogaleus contortus. An extinct tiger like shark. An image of the other side is needed for curation. If you give me permission, I can fill in all the details.

Not a lemon shark. This appears to be Carcharhinus plumbeus, sandbar shark. Please use a more contrasting background (lighter), in addition to an image of the other side.

Not a thresher shark. This is an upper Carcharhinus species. However due to the wear, it is impossible to tell which one.

Aetobatis, Eagle Ray. Rhinoptera bars are not as angular. Also please use a background that contrasts more (lighter) with the teeth.

Picture is too unclear and small to tell exactly what genera it is. It doesn’t appear to be a thresher shark. A better, closer image would be helpful. Also use a background that contrasts with the tooth. Grey on grey makes it difficult to produce a clear image.

Not a lemon shark. This is an upper tooth of a Carcharhinus species but due to the wear, it is difficult to narrow down exactly which species.

Unlike many of the other postings, this actually appears to be a lower Lemon shark tooth (Negaprion) although unusually small. Must have been a very young shark. An image of the other side would help to confirm this. A scale bar (ruler) in the image would help as well.

Order Myliobatiformes = stingrays. They have a crushing plate made of rows of bars fit together. The smooth side is top part of the plate (biting part) while the ridged part is the root.

Galeocerdo is a tiger shark which have very distinctive teeth. This is not a tiger shark but instead a lower Carcharhinus species. From the lower teeth (which this is), it is usually (there are a few exceptions) to narrow down the exact species. Due to the wide root, it is possibly (possibly) a Sandbar Shark tooth (Carcharhinus plumbeus).