Activity Mike Marschinke posted an image in the group What is it? from the myFOSSIL app 4 months, 1 week ago 4 months, 1 week ago 4 months, 1 week ago What is this? Patrick Hsieh replied 4 months, 1 week ago Interior mold of a gastropod. Since none of the shell is preserved, it is impossible to identify it further. Information on where it was found (geological formation, gps coordinates) is necessary but not sufficient to tell you more.