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The geologic record of the Triassic is sparse in Georgia and the Jurassic is absent altogether from the state's rock record. During the Cretaceous, however, southern Georgia was covered by seawater. This sea was home to clams, fish, oysters, and burrowing shrimp. [1] The tree Araucaria gladenensis grew in Georgia during the Cretaceous. [5]
Crinoids are echinoderms in the phylum Echinodermata, which also includes the starfish, brittle stars, sea urchins and sea cucumbers. [5] They live in both shallow water [6] and in depths of over 9,000 metres (30,000 ft). [7] Adult crinoids are characterised by having the mouth located on the upper surface.
This list of the prehistoric life of Georgia (U.S. state) contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Georgia (U.S. state). Precambrian
Like extant crinoids, Agaricocrinus americanus was anchored to a hard surface by a holdfast out of which grew an articulated stalk. On top of this was a calyx with a number of feather-like arms. Each arm bore short branches known as pinnules and from these cirri were extended which sifted plankton from the water flowing past.
This list of the Mesozoic life of Georgia contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Georgia and are between 252.17 and 66 million years of age.
Etowah Indian Mounds are a 54-acre (220,000 m 2) archaeological site in Bartow County, Georgia, south of Cartersville.Built and occupied in three phases, from 1000–1550 CE, the prehistoric site is located on the north shore of the Etowah River.
Pentacrinites is an extinct genus of crinoids that lived from the Hettangian to the Bathonian of Asia, Europe, North America, and New Zealand.Their stems are pentagonal to star-shaped in cross-section and are the most commonly preserved parts. [1]
Hypothesized to live in a forested habitat Smitanosaurus: 2020 Morrison Formation (Late Jurassic, Oxfordian to Tithonian) United States ( Colorado) Only known from a partial skull and some vertebrae Sonorasaurus: 1998 Turney Ranch Formation (Early Cretaceous to Late Cretaceous, Albian to Cenomanian) United States ( Arizona) State dinosaur of ...