The Fossil Record and Geologic Time Scale A natural cast forms when flowing water removes all of the original tissue, leaving an impression.
{"Image DocumentName": "Fossils can form in several ways.", "Image ImageDescription": "Permineralization occurs when minerals carried by water are deposited around a hard structure.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}