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The only recorded find of a dinosaur fossil in Central America consists of a single femur discovered from Middle Cretaceous age deposits in Comayagua Department in the central part of Honduras. The fossil had been found in January, 1971 by Bruce Simonson and Gregory Horne, though it was later sent to the National Museum of Natural History, USA ...
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.
Mississippian America was once more covered in seas, [12] now notably home to abundant crinoids. [13] During the Pennsylvanian America was largely terrestrial [14] and vast swamps expanded across the country [15] which were home to amphibians. [16] Reptiles were appearing around this time. [17]
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.
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]
Cyathocrinites is an extinct genus of crinoids that lived from the Early Silurian to the Late Permian in Europe and North America.