Hi Pete, I think you are correct. The tooth appears to be from the marine crocodile, Thecachampsa. The fossils at Holden Beach come from multiple stratigraphic layers, so it is difficult to narrow down the age of your tooth and the specific identity.

You may also want to compare your tooth with mosasaur teeth, which can also be found at Holden.…[Read more]

<span class=”atwho-inserted” contenteditable=”false” data-atwho-at-query=”@bm”>@bmacfadden</span> Hey Bruce, can you confirm the ID on this tooth?

The image is too blurry to tell what it is, but it does not appear to be teeth.

This appears to be an ironstone concretion.

Hi Sammy,

This is not a tooth.

Hi Sammy,

We’ll need more photos to confirm an ID, but it doesn’t look like a bone to me.

Looks like a scallop impression in limestone.

Honestly, some parts of it look like a limestone or dolomite and other parts of it look like chert. It may not be from the Avon Park Formation, but it could be from a unit that is the same age in Alabama. This website mentions the “Claiborn/Jackson Group” which include “fossiliferous chert and limestone boulders”.…[Read more]

Hi David, Rachel is 100% correct. What you are seeing is a calcite vein within the rock.

Hi Todd,

My best guess would be that it is either an ichthyosaur or dinosaur vertebra, given that the Cretaceous interior seaway cut through Phillips County, Montana.

There is a small museum you could visit/reach out to for more information: https://mtdinotrail.org/phillips-county-museum/

Best,

Victor

I don’t think they are teeth. It looks like you’ve got a conglomerate, which is a rock composed of rounded grains of varying sizes.

Hi Nathan,

This tooth is from an extinct mackerel shark, Otodus obliquus. It is likely around 60 million years old and is the ancestor of the popular megatooth shark, Otodus megalodon.

I don’t really know what you mean by real or fake. It’s a real rock… Specifically it’s chert (a variant of quartz).

Hi James, thanks for sharing your finds! Unfortunately, these all appear to be rocks rather than fossils. The one you thought is a coprolite is actually a rock called breccia.

Hi Patricia! This is a Sheepshead fish tooth. The genus is Archosargus.