Texas fossil ID

[Jurassicbro238]

A friend and I went fossil hunting in Johnson County, Texas in a few rivers. I'm not sure which formation these were in but my friend said this is dated to the Cretaceous period but he wasn't sure what part. He wasn't too familiar with what species are fossilized here. Is anyone familiar with the fossils in this area?

 

1-4 (left to right). I'm unsure about these ones. I think they're just interesting rocks but there were a lot of these in the river. I suspect the far right is a fishing lure of some kind too.

 

5. This was a pretty neat bivalve that was found away from the river. I'm not super familiar with bivalve anatomy but what are those 2 bumps on one of the sides?

 

6. I'm fairly sure is an ammonite fragment. Are those 3 rows of bumps identifiable to a genus or is it better to leave it as just as ammonite?

 

7. Not sure if this is turrilites. Is it possible to remove it from the matrix or is it better to leave it like that?

 

8-14. Assorted shells for the most part. I found 3 complete bivalves which was exciting, one with the pattern still intact! The last one is really interesting to me though. My friend suggest maybe it was a fish vertebra but he's not 100% sure. I'll be posting their pictures from left to right.

8.

9.

10.

11.

12.

13.

14.

 

15. Tiny clam?

 

16. One of my favorite finds even though it's so weathered down. Not sure if it's an ammonite or nautiloid though

17. An inoceramid? It looks like the pattern wraps around the rock so I'm not sure if that's how thick they are or it's something else

 

Thank you all for your time!

 

Edited November 27, 2023 by Jurassicbro238

[Coco]

If you put a number to each of your photos it would be more convenient to answer you. You can still edit your message to number them

 

Coco

Edited November 27, 2023 by Coco

[Jurassicbro238]

9 hours ago, Coco said:

If you put a number to each of your photos it would be more convenient to answer you. You can still edit your message to number them

 

Coco

Oops, reformatted! Hope this is more useful

[M Harvey]

The large clam is a deer heart.  In Alabama they occur in the Ripley formation which is upper Cretaceous,  Maastrichtian stage.   The fragment is ammonite and the large coiled fossil is a nautilus.  I'm also seeing a couple of small brachiopods and a gryphaea.    Your inoceramid may be small nautilus.  Sorry, I can't be more specific.   

[Jurassicbro238]

2 hours ago, M Harvey said:

The large clam is a deer heart.  In Alabama they occur in the Ripley formation which is upper Cretaceous,  Maastrichtian stage.   The fragment is ammonite and the large coiled fossil is a nautilus.  I'm also seeing a couple of small brachiopods and a gryphaea.    Your inoceramid may be small nautilus.  Sorry, I can't be more specific.   

Wow thanks! How do you tell the difference between ammonite and nautiloid? Is it sutures?

[ClearLake]

#8 and #9 are brachiopods, most likely Waconella wacoensis

#10 and #11 are the bivalve Neithea

#12, #13, and #15 I believe are all oysters of some type

 

 

On 11/27/2023 at 9:13 PM, Jurassicbro238 said:

How do you tell the difference between ammonite and nautiloid? Is it sutures?

Here is a nice depiction of the difference between the two from this website: https://www.luckysci.com/2014/05/the-quick-difference-between-nautiloids-and-ammonoids/

 

 

[Jurassicbro238]

Thanks for your help! Didn't know that about ammonoids

[Brandy Cole]

Hard for me to tell, but could 16 be an exogyra?