GENERAL GEOLOGY

Detailed explanation-1: -A cast is a solid copy of the shape of an organism. Molds and casts can preserve fine details. an organism become petrified . The term petrified means “turned into stone.” Petrified fossils are fossils in which minerals replace all of an organism, or a part, such as a dinosaur bone.

Detailed explanation-2: -If water rich in minerals fills this space, crystals can form and create a fossil in the shape of the original bone or shell, known as a cast fossil. Or sediment can fill the mould and form a cast fossil.

Detailed explanation-3: -A cast is a solid copy of the shape of an organism. Petrified fossils are fossils in which minerals replace all or part of an organism. Another type of fossil is a carbon film, an extremely thick coating found on rock.

Detailed explanation-4: -Sometimes when an animal dies and its body decays, it can leave an imprint in the sediment. If this imprint fills in with minerals from sediment and groundwater, it can harden to form a fossil. This fossil is called a cast fossil. The fossilized imprint is called a mold fossil.

Detailed explanation-5: -Shells, bone, and wood often form as molds or casts. Some trace fossils (ichnofossils), such as tracks and burrows can form as casts or molds. Tracks and burrows can provide clues to the behavior and biomechanics of an organism while it was alive. Concretions often encapsulate a fossil mold and cast.