Temporal range: 5–4 Ma
|Chesapecten jeffersonius (exterior of shell)|
|Chesapecten jeffersonius (interior of shell)|
( Say, 1824)
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Chesapecten jeffersonius is the fossilized form of an extinct scallop, which lived in the early Pliocene epoch between four and five million years ago on Virginia's coastal plain. Chesapecten jeffersonius are commonly found in strata exposed along Coastal Plain cliffs along major rivers in southeastern Virginia and eastern North Carolina, and it is the index fossil for the Lower Yorktown Formation.
In 1824, geologist John Finch gathered a large collection of mollusk fossils, including Chesapecten jeffersonius, from the vicinity of Yorktown, Virginia, and gave them to scientists at the Academy of Natural Sciences of Philadelphia (ANSP).
Chesapecten jeffersonius is distinguished from other Chesapecten species by the number of ribs (9 to 12), and a rather rounded shell edge. 
- "Chesapecten jeffersonius Virginia State Fossil". statesymbolsusa.org/.
- Ward, Lauck (2007). "Virginia's Coastal Plain: Where the New World Originated" ( PDF). Inside Virginia Museum of Natural History Research. Virginia Museum of Natural History; Smithsonian Institution (2): 7. Retrieved March 31, 2012.
https://geology.blogs.wm.edu/2016/07/13/virginia-state-fossil/. Missing or empty
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