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The carnivorous snails have tongues that are covered with thousands of tiny teeth to tear apart food. The gastropod fossils from Jacksboro, TX shown below are from the Pennsylvanian, Finis formation, and these gastropods lived about 300 million years ago.
Cone Snail Shells. All cone snail shells are cone-shaped, but they're found in a wide variety of colors, patterns and designs. They can be large or small, slender or broad. The shell's top can be flat, round or pointed, and the shoulder can be rounded, sloped or squared.The texture varies from smooth to corded, grooved or knobby.ll cone snail shells are cone-shaped, but they're found in a wide variety of colors, patterns and designs. They can be large or small, slender or broad. The shell's top can be flat, round or pointed, and the shoulder can be rounded, sloped or squared. The texture varies from smooth to corded, grooved or knobby.