Homepage › Forums › What Is It? › Gastropod cork screew cast or interior mold Tagged: cleaning, gastropod, id This topic contains 0 replies, has 1 voice, and was last updated by David Powers 1 year ago. Viewing 1 post (of 1 total) Author Posts July 31, 2018 at 9:22 am #40312 David PowersParticipant I found a gastropod cast or interior mold. I want to identify it. I fear removing the surrounding matrix will remove remaining shell. I need some advice. It was found in Mission Canyon Limestone, Madison Group, Mississippian Visean. Attachments:You must be logged in to view attached files. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.