Wondering what these are..

[June P]

I’m not sure what this is. This little croissant shaped guy struck me as interesting as I was hunting through a pile of limestone in our new construction neighborhood in northern Bexar County, Texas. It’s in northern San Antonio. 

I thought it might be a shell of some sort. It’s about 4.5 to 5 inches wide and about 1.5 inches in depth. It has striations here and there and a shape that looks like a nautilus, but may just be an interesting concrete on or piece of limestone. 

Anyone got any ideas or answers? 

The ‘center’ of the ‘croissant’ has a grayish area that’s really different from the rest of it.

Thanks for any ideas!!!

[fifbrindacier]

Hi, it looks to have some bits of shell on it. Maybe an oyster ? I'm unsure though.

[JohnJ]

I'm inclined to say this is the chert steinkern of a rudist.

[fifbrindacier]

Yes, i agree.

[June P]

Attaching some photos of fossils I found in San Antonio, Bexar County, Texas in my new construction neighborhood that used to be an old ranch. There are 200+ year old Live oaks and lots of petrified wood. I’ve found these interesting fossils. I wonder if the one that is crescent shaped might be an ammonite. The other looks like a worm of some sort. I found them in an area about a foot down (the clearing of the top soil was already completed by construction equipment. 

The area had a lot of crystallized and agatized tree trunks and limbs. I found the ‘worm’ looking creature in this pile. 

The crescent shaped thing/creature was found several hundred feet from the ‘crystal pile’. 

Any ideas y’all? 

Thanks in advance!

[JohnJ]

42 minutes ago, June P said:

Attaching some photos of fossils I found in San Antonio, Bexar County, Texas in my new construction neighborhood that used to be an old ranch. There are 200+ year old Live oaks and lots of petrified wood. I’ve found these interesting fossils. I wonder if the one that is crescent shaped might be an ammonite. The other looks like a worm of some sort. I found them in an area about a foot down (the clearing of the top soil was already completed by construction equipment. 

The area had a lot of crystallized and agatized tree trunks and limbs. I found the ‘worm’ looking creature in this pile. 

The crescent shaped thing/creature was found several hundred feet from the ‘crystal pile’. 

Any ideas y’all? 

Thanks in advance!

 

 

Hi June, I merged your previous topic with your new one.  We try to avoid more than one topic on the Forum about the same items to cut down on duplicate responses and keep the continuity of thought.

 

Your second item was also previously posted HERE.

[abyssunder]

I agree with JohnJ. The first specimen looks like a rudist, maybe a caprinid rudist or maybe a requieniid one like Toucasia hancockensis/ T. texana.

Edited January 19, 2022 by abyssunder