GENERAL GEOLOGY

Detailed explanation-1: -Fossils are the remains or impressions of organisms, preserved in petrified molds or casts. They are particularly useful to biologists who can use them to discover extinct animal species, and and study the way that those animals evolved and lived.

Detailed explanation-2: -The mineralized sediment that fills the mold recreates the shape of the remains. This is called a cast.

Detailed explanation-3: -A cast forms as the result of a mold. Water with dissolved minerals and sediment fills the mold’s empty spaces. Minerals and sediment that are left in the mold make a cast.

Detailed explanation-4: -We find molds where an animal or plant was buried in mud or soft soil and decayed away, leaving behind an impression of their bodies, leaves, or flowers. Casts are formed when these impressions are filled with other types of sediment that form rocks, which take the place of the animal or plant.

Detailed explanation-5: -What are casts and molds? Casts and molds are types of fossilization where the physical characteristics of organisms are impressed onto rocks, especially coarse porous rocks such as sandstones.