The Chengjiang Fauna and the Burgess Shale Fauna are A early and middle Cambrian in age, respectively B unusually well preserved fossil assemblages C have representatives of all the modern animal phyla D include examples of early Chordates E all of the above The Laramide Orogeny... (Select all that apply) A began in the Cretaceous and continued into the Tertiary (Paleogene) B was the final phase of mountain building of the Cordilleran Mountain system C began in the Triassic and continued into the Jurassic

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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.