Texas Lake Fossil ID?

[Woodlol]

Good afternoon!

 

On a recent trip to Lake Bastrop in central Texas my dog dug up this rock along the shore. It's a very clay/muddy lake with plenty of greenery, it seemed pretty run of the mill at first with some broken shell fragments but an odd hole on one side with markings around it was confusing. I'm definitely new to this so forgive me if I don't know the terminology, but the hole is about 3/4 inch deep. 

There are what look like scales at various points around the rock. 

 

Thank you! 

[Rockwood]

The top one has to be a rudist. The other are gastropods (snails).

[TqB]

I agree with Rockwood - I think there are several rudists in there as well as gastropods..

Welcome to the forum - a rudist for a first post is pretty cool, they're often posted as mystery fossils and can resemble many others. 

[Woodlol]

Very cool! Thank you! Benefits of being on the Colorado river is the plethora of cool fossils if you can swim. 

[ynot]

+1 for what the others said.

 

And Welcome to !

 

Can We see some of the other fossils You have found?

[Woodlol]

Well I was curious about this one as well, would this be another part of a rudist? 

[ynot]

I think it is, but am not sure.

Wait for those with more smarts on coral to reply.

[TqB]

Caprinuloidea or similar I think. I'm no rudist expert though (and note that they're weird bivalves, not corals!).

[ynot]

2 minutes ago, TqB said:

Caprinuloidea or similar I think. I'm no rudist expert though (and note that they're weird bivalves, not corals!).

 

whoops. Am I ever red in the face!

I always get the two confused (I think it is a dyslexia thing).

[TqB]

@ynot I wouldn't worry - I bought my best rudist colony described by the seller as a coral. 

[Woodlol]

Here's one other one, you're opening pandoras box I've been tempted to go troll the bottom of the lake and now I have an outlet for sharing what turns up! Also forgive me if anything I post is naturally occurring formations in the rock, still learning. 

[abyssunder]

I have no doubt about caprinid rudists and gastropods present in the posted pictures , correctly identified before.

This document might help.

 

 

 

[old bones]

Welcome to the Forum, Woodlol. Thats a good dog! 

[Uncle Siphuncle]

Hey guys, if this find was made at Lake Bastrop, keep in mind that local surface geology is Eocene, specifically Wilcox Group and Carrizo Sand, with the closest Upper Cretaceous sediments 10-15 miles away.  If we are looking at a rudist, and rudists died out in the Cretaceous, it is worth noting that the specimen wasn't originally deposited in the Lake Bastrop area.  Maybe the Colorado meandered a bit north eons ago, transported and deposited this as a worn cobble.

[doushantuo]

Some of you may like this

[erose]

On 7/12/2017 at 0:52 PM, Uncle Siphuncle said:

Hey guys, if this find was made at Lake Bastrop, keep in mind that local surface geology is Eocene, specifically Wilcox Group and Carrizo Sand, with the closest Upper Cretaceous sediments 10-15 miles away.  If we are looking at a rudist, and rudists died out in the Cretaceous, it is worth noting that the specimen wasn't originally deposited in the Lake Bastrop area.  Maybe the Colorado meandered a bit north eons ago, transported and deposited this as a worn cobble.

Very cherty (=hard) looking rounded cobble. Big floods could have moved it east from the original outcrop. OR it was included in heavy gravel fill used commonly around here.