Crinoids are also echinoderms and have a five point shape in the middle of their stem. Crinoids were filter feeders, attaching themselves to the sea floor and filtering food as it passed by. Pictured on the following pages are parts of the stem that grew in sections, and has the distinct pattern in the center. Also shown are portions of the crinoid cups, plates, and spines. They were found in the Pennsylvanian Formations of Jack Co., Wise Co. and Palo Pinto Co., TX, These specimens are about 300 million years old.
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Crinoids in Palo Pinto Co., TX