Slab of fossil sea urchins, 17 in. wide, Lower Cretaceous, Cooke Cty., Texas. All are Holasters except for those broken which are Halfasters. 🤪 #Urchins #Cretaceous #paleontology #Holaster
May 17, 2025 at 9:21 PM
Slab of fossil sea urchins, 17 in. wide, Lower Cretaceous, Cooke Cty., Texas. All are Holasters except for those broken which are Halfasters. 🤪 #Urchins #Cretaceous #paleontology #Holaster