name 7 types of fossils?
the perserved trace, imprint, or remains of a plant or animal
hollow area in sediment in the shape of an organism.
soild copy of a shape of an organism
fossils in which minerals replace all or part of an organism
thin film of carbon residue preserved as a fossil
provide evidence of the activities of ancient organisms
ex:like a footprint
organisms that become preserved in materials other than sediment
distinctive fossil used to compare the relative ages of fossils
early life (570-286 million years ago); single cell organisms, shells, mollusks, brachiopods, rise of first vertebrates, rise of land plants, amphibians, insects, seed plants, and trees, and reptiles
middle life (245-144 million years ago); rise of mammals and dinosaurs; the rise of birds; extinction of dinosaurs, rise of flowering plants
era of recent life that began about 66 million years ago and continues today; includes the first appearance of Homo sapiens about 400,000 years ago
the smallest unit of geologic time; periods are divided into these
a unit of geologic time into which eras are divided
a unit of geologic time that includes two or more periods