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Greetings @lillian-christiansen ! At first glance yourself specimen appears to be a brachiopod, but could be a bivalve as well. Do you have any location data (ie, county/municipality) of where you collected your specimen? It would help narrow down an ID.

Hi, the park is located in Palo pinto county, Texas

@lillian-christiansen Looks likes your specimen is from the Mineral Wells Formation, which contains sediments from the Pennsylvanian epoch of the Carboniferous era. And though it is rather worn, from the features available I believe your specimen is a variety of orthid brachiopod.

I remember going there when I was five for their grand opening, really helped spark my obsession for fossils and anything prehistoric 😀