There are also occasionally found unaltered hard parts, that is for example bones that are still bone. In a few cases unaltered soft parts, still the original organic material, have been found. In certain arctic areas creatures have been found frozen in ice or frozen mud, such as the famous Siberian mammoths. There are also various forms of traces of creatures such as footprints in rock, worm burrows, fossilized dung, mold fossils, and cast fossils. A mold fossil is a cavity, usually where a shell has been but the shell broke up or decayed, leaving the cavity having the shape of the shell.
Casts are just the opposite.
When evolution is the only view of origins taught to children in science, there are many important facts that are left out, including the following. All the following points, which are very important to creationists, actually come from the research of evolutionists. All of the following points have been thoroughly documented as coming from scientific journals and books, written by evolutionists. There are four characteristics of the fossil record that agree with the creation view much better than the evolution view. For instance, in the oldest rock layer, known as Precambrian, there are almost no fossils, and then suddenly there are many fossils of various shelled creatures.