Collected from one of the 3 known fossil bed's at, South Cirebon. North West Java Island. A paper was written on Fossils from this Cirebon area, by 2 local Indonesian's. 3 location's south of Cirebon was mentioned. Paper is available on line. https://www.researchgate.net/publication/321026420_THE_TERTIARY_MOLLUSK_FOSSIL_DISPERSION_ON_THE_SOUTHERN_PART_OF_CIREBON_AREA ..... Fossils found on the near top surface layer from carbonate sandstone. Kalibiuk Formation, Chirebonian Stage, Early Pliocene