If we continue backwardsin time, we will successively come to levels where no fossils of flowering plantsare present, no birds, no mammals, no reptiles, no four-footed vertebrates, noland plants, no fishes, no shells, and no animals. If we begin at the present and examine older and older layers of rock, we willcome to a level where no fossils of humans are present. Stratigraphic ranges and origins of some major groups of animals and plants. (3) The kinds of fossils found in rocks of different agesdiffer because life on Earth has changed through time. (2) Most fossils are the remainsof extinct organisms that is, they belong to species that are no longer livinganywhere on Earth. Fossils, Rocks, and Time: Fossil Succession FOSSIL SUCCESSION Three concepts are important in the study and use of fossils: (1) Fossilsrepresent the remains of once-living organisms.
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