Features found at Kickapoo Caverns & unidentified

[nluis]

I went camping over in West Texas in Kickapoo Caverns state park this past weekend. While I was hiking around I noticed dozens of these formation that were jutting out of the limestone boulders and bedrock. Not sure what they are but they seem to be shaped like small trees or medium thick branches.

 

Anyone know what they are? 

[nluis]

More photos

[Rockwood]

The preservation makes it difficult to be certain, but I think they are most likely fragments of a branching bryozoan colony.

[Al Dente]

Looks like a chert nodule. Chert is more resistant to weathering than the surrounding limestone.

[Ludwigia]

And the chert may have in turn filled burrows?

[JohnJ]

They are, indeed, chert nodules.