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Greetings, this is my first post on this forum! I can typically identify most of my finds using google, but I found an interesting / poorly formed cast, or maybe concretion?, in a shape I hadn't seen before and I have no idea what it is or how to potentially clean it. It seems pretty fragile, and with no idea what I am looking at, I haven't attempted any cleaning. Hoping to find some ideas here! Found in Hays county, TX, presumably part of the Glen rose limestone formation. Came out of a small cliff made from an old small quarry dug out of the side of a hilltop. The limestone it came out of is yellow / gray and crumbles easily, it frequently breaks apart to reveal poorly formed "clam" cast clusters (the entire hilltop is basically an ancient 'oyster' bed), periodically produces some nice specimens though! Could have come out anywhere from ~5-12 feet (~1.5-3m) beneath the cliff face (I am presuming in the lower range since it was still intact, a higher fall may have split it). Crab? Coral? Cluster of 'clams'? Stingray?? Lol, I am utterly stumped on this one. If I left out any useful information or if any more photos are desired, just ask and I'll do my best to provide it! Thanks!

It has a brown colored rock inside shown in the last picture.