Fossils are formed through a variety of processes, including mineralization, carbonization, and petrification.

Petrified fossils are formed when an organism's hard parts are replaced by minerals, such as silica or calcite.

Trace fossils are the preserved remains or traces of an organism's activity, such as footprints, burrows, or trails.

Molds are formed when an organism's soft parts are preserved in a cavity or depression in a rock.

Paleontology is the study of fossils and the history of life on Earth.

Replacement fossils are formed when an organism's hard parts are dissolved and replaced by a different mineral, such as silica or calcite.

Fossils can be dated using a variety of methods, including radiocarbon dating, potassium-argon dating, and uranium-lead dating.

Original fossils are formed when an organism's hard parts are preserved in their original form, without being replaced or altered by geological processes.

Paleobiogeography, paleoecology, and paleoclimatology are all subfields of paleontology that study the distribution of fossils in space and time.

Molds are formed when an organism's hard parts are preserved in a cavity or depression in a rock.

Fossils are formed through a variety of processes, including mineralization, carbonization, and petrification.

Petrified fossils are formed when an organism's hard parts are replaced by minerals, such as silica or calcite.

Trace fossils are the preserved remains or traces of an organism's activity, such as footprints, burrows, or trails.

Molds are formed when an organism's soft parts are preserved in a cavity or depression in a rock.

Paleontology is the study of fossils and the history of life on Earth.