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Tennessee State Fossil
(Pterotrigonia (Scabrotrigonia) thoracica)
Adopted on May 11, 1998.
In 1998, Tennessee designated an official State Fossil, the bivalve mollusc, (Pterotrigonia thoracica,) from the Late Cretaceous (Maastrichtian) age Coon Creek Formation. "Ptero," as it is affectionately known, inhabited the floor of an ocean that covered West Tennessee about 70 million years ago.
Tennessee State Fossil: Bivalve Mollusc
The campaign to have Ptero named as the State Fossil began in 1996 at The University of Tennessee at Martin. Spearheading the effort was UT Martin's GeoClub, a student organization dedicated to geological and geographic studies. Between 1996 and 1998, GeoClub members and geology professor Michael A. Gibson worked on determining a suitable nominee for state fossilhood and laying the groundwork for legislative action. With the supportive sponsorship of State Senator Roy Herron (D-Dresden), Ptero was named State Fossil in 1998 by the Tennessee legislature.
Characteristics of the Bivalve Mollusc
Bivalves are the class of molluscs that includes clams, oysters, mussels, and scallops. This bivalve lived during the Cretaceous Period, around 70 million years ago, when Tennessee was encroached upon by a shallow sea.
Animals of the Class Bivalvia are known as bivalves because they typically have two-part (The hard largely calcareous covering of a mollusc) shells, with both parts being more or less symmetrical. The Class has 30,000 ((biology) taxonomic group whose members can interbreed) species, including (Edible marine bivalve having a fluted fan-shaped shell that swim by expelling water from the shell in a series of snapping motions) scallops, (Burrowing marine mollusk living on sand or mud) clams, (Marine mollusks having a rough irregular shell; found on the sea bed mostly in coastal waters) oysters and (Marine or freshwater bivalve mollusk that lives attached to rocks etc.) mussels. The name is also spelled Bivalva. An old name for the Class is Pelecypoda.
Tennessee House Joint Resolution No. 552 on May 11, 1998.
Filed for intro on 03/02/98
Taxonomic Hierarchy of the Bivalve Mollusc
Most US states have made a state fossil designation, in many cases during the 1980s. It is common to designate one species in which fossilization has occurred, rather than a single specimen, or a category of fossils not limited to a single species.
Some states that lack a "state fossil" have nevertheless singled out a fossil for formal designation such as a state dinosaur, rock, gem or stone.
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