Paleontology in Rhode Island

No Precambrian fossils are known from Rhode Island, which was located in the polar latitudes of the southern hemisphere at that time. The fossil record of the state's early Paleozoic history does not add much information about the state's ancient wildlife either. Nevertheless, evidence indicates that the state was at least partially submerged by seawater at some time during this interval. Among the few known fossils from this general time period are trilobites preserved in metamorphic rocks deposited in that same Paleozoic sea. During the Carboniferous period the same geologic forces that would later become responsible for dividing Pangaea triggered the formation of a rift basin in the northern part of the state. Rivers and streams drained into the basin, which became a swampy environment.^[2] Rhode Island was home to a rich flora during the Pennsylvanian epoch of the Carboniferous. These plants left behind abundant fossils like leaves, stems, and trunks.^[1] Club moss and horsetail fossils are preserved as casts in sandstone of more recent age. One of the best of these later specimens was a trunk with a 16-inch diameter from a tree that was estimated to be more than 50 feet tall.^[1]

Carboniferous Rhode Island was home to a variety of arthropods. Anthracomartus, a type of anthracomartidae, was an arachnid that lived in Rhode Island during the Carboniferous. This genus was the first Carboniferous arachnid ever found in the eastern United States. Other notable Carboniferous arthropods from Rhode Island included a previously unknown genus of neuropteroid (related to the net-winged insects), as well as a new protophasmid (an herbivorous insect).^[1] At the time, Rhode Island was also home to many kinds of cockroaches.^[3]

During the Permian the geologic forces that would later split Pangaea continued the process of rift basin formation in northern Rhode Island.^[2] During the Triassic and Jurassic local sediments were being eroded away from the state rather than deposited, so there are no rocks of this age in which fossils could have been preserved within Rhode Island's boundaries. Despite the absence of Triassic and Jurassic rock in the states, some sedimentary rocks dating back to the Cretaceous have persisted on Block Island.^[2] Nevertheless, no dinosaur fossils have ever been discovered in Rhode Island.^[4] Like during the Triassic and Jurassic, Rhode Island's sediments were being eroded away rather than deposited during the ensuing Paleogene and Neogene periods of the Cenozoic era, leaving another gap in the state's geologic and fossil record. More recently, during the Pleistocene, Rhode Island was scoured by glaciers.^[2]

Near the end of 1892 a clergyman from Providence discovered the fossilized wing of a prehistoric cockroach in Pawtucket.^[1] In 1914 construction began for a trolley tunnel to run through College Hill.^{[citation needed]} During excavation an abundance of plant fossils were found that were later curated at Brown University.^[1]

• Rhode Island Museum of Natural History and Planetarium, Providence

• Paleontology in Connecticut
• Paleontology in Massachusetts

• Murray, Marian (1974). Hunting for Fossils: A Guide to Finding and Collecting Fossils in All 50 States. Collier Books. p. 348. ISBN 9780020935506.
• Springer, Dale, and Judy Scotchmoor. July 1, 2005. "Rhode Island, US." The Paleontology Portal. Accessed September 21, 2012.
• Weishampel, D.B. & L. Young. 1996. Dinosaurs of the East Coast. The Johns Hopkins University Press.

• Geologic units in Rhode Island
• Paleoportal: Rhode Island