Coral Reef or Sponge formations?

[AKJ]

We have hiked among these rock formations on our ranch (west central Texas). Not familiar with a lot of geology but we do have a hill nearby with lots of oyster/shell fossils. Would be curious to hear the thoughts of those who know more about these things.

 

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[islamoradamark]

that's fossilized coral. Down here in South Florida that would be the cap rock, we would auger several holes pour with concrete and build a house the first two don't recognize the third one. ooooo welcome to T- net

 

[scilover]

Judging from the third picture, I think it’s a fossilized coral. I can still see the features of the coral itself, could have been a shallow shelled coral but I’m not 100% sure.