Unknown from Woodbine

[Lone Hunter]

I've been finding all kinds of strange things in this new spot in Woodbine, here's another I have no idea on. First thought was shell piece until magnification, pretty sure it's not, looks nothing like typical shells or preservation in the rest of rocks. It's kinda square, flat, and the black lines appear to be associated with it like antenna or something. Not even sure if it's plant or animal, looks bug like.  Appreciate any help as always!

[daves64]

Not sure what that is, but I think the black lines are mineral veins, or mineral filled fractures.

Edited August 11, 2022 by daves64

[Scylla]

Conularid? What age is the rock there? 

Edited August 11, 2022 by Scylla

[Lone Hunter]

Late cretaceous, probably Cenomanian 91-97 myo. Looks remarkably like a Conularid, they are found in Texas but I don't think from around here, still a possibility?

Edited August 11, 2022 by Lone Hunter

[DPS Ammonite]

Conularids are Cambrian thru Triassic and not Cretaceous fossils. How about a piece of shell with ribs?

 

https://en.m.wikipedia.org/wiki/Conulariida

[Lone Hunter]

Don't think I can be convinced it's a piece of shell,  since Conularids are not that far away like Mineral Wells,  and given the odd depositional time frame of Woodbine I would think there would be a chance it could have been transported. A Conularid was tentatively identified in the upper cretaceous of Tennessee so who knows. Of course open to other suggestions other than shell for now

[Lone Hunter]

Bivalve from same area with typical preservation of ribs for comparison.

[DPS Ammonite]

Are you saying that it might be a Cretaceous conularid or that it was an older fossil redeposited?
 

Conularids are phosphatic therefore should be blackish or bluish and should not fizz in acid vigorously? Pennsylvanian conularids in Jacksboro are bluish black. Does it fizz? It does not look phosphatic by looking at the color.
 

Are we looking at a mold or the actual fossil shell or a cast? A mold probably would not also be phosphatic.

 

What is the reference for the Tennessee conularid? Was it Cretaceous or an older redeposited fossil?

 

https://www.mdpi.com/2076-3263/2/1/1/htm

 

 

 

 

 

Edited August 11, 2022 by DPS Ammonite

[Lone Hunter]

Texas Conularids I saw pictures of were not all blue black,  I had seen the article you posted also. The one in Tennessee was cretaceous, I'll try to find the reference. So thinking this would be a redeposit although being cretaceous wouldn't be impossible I suppose,  given I've found crinoid stems and a spirifer not far from this site things have a way of getting here though. No reaction in vinegar. 

[Lone Hunter]

A few more examples of things found in same area, trying to determine if they all belong together, well pretty sure the light colored bivalve doesn't, such great preservation of detail where might it be from? Have found gobs of tiny bivalves with little pointy beaks and a tiny odd gastropod that I can't ID.