Fossils & Geologic Time, WOR-ZIT
Geologic time is the extensive interval of time occupied by the geologic history of Earth. Formal geologic time begins at the start of the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day.
Fossils & Geologic Time Encyclopedia Articles By Title
Wordian Stage
Wordian Stage, second of three stages of the Middle Permian (Guadalupian) Series, made up of all rocks deposited......
Worthenia
Worthenia, genus of extinct gastropods (snails) preserved as common fossils in rocks of Devonian to Triassic age......
Xenacanthus
Xenacanthus, long-surviving but now extinct genus of freshwater sharks. Xenacanthus survived from the end of the......
Yinlong
Yinlong, ceratopsian dinosaur genus known from a single nearly complete skeleton taken from the Junggar Basin of......
Zittel, Karl Alfred, Ritter von
Karl Alfred, knight von Zittel was a paleontologist who proved that the Sahara had not been under water during......