What is a geological intrusion? Gaps in the stratigraphic record as a result of non-deposition or erosion Evidence of the activities of extinct organisms, such as footprints The replacement of some part of the original stratigraphic profile with younger material Any evidence of past plant or animal life that is preserved in the material of the Earth's crust

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Paleontology

A branch of science concerning the scientific study of life from ancient times is known as paleontology. The scientists working on paleontology are known as paleontologists. Paleontologists collect the fossils of organisms from ancient times to classify them. The paleontologists also study the environment from ancient times to study the interactions between different organisms.