Chesapecten madisonius
NameChesapecten madisonius
Scientific NameChesapecten madisonius
Common NameVirginia Scallop, Madison Scallop
FamilyPectinidae
GenusChesapecten
Speciesmadisonius
Geographic DistributionFossil records primarily from the Atlantic Coastal Plain of North America, particularly Virginia, Maryland, and North Carolina, within Miocene and Pliocene geological formations.
Average Size (mm)100-200 mm (This species is known for its large size, often reaching up to 15-20 cm in height/length, consistent with the specimen shown in hand).
Identifying FeaturesLarge size, distinct fan shape, prominent and rounded radial ribs (typically 10-15), and clear concentric growth lines. The overall robust and thick shell structure is characteristic.
Dietfilter-feeder
Raritycommon
Author Citation(Say, 1824)
Description
A large, robust fossil scallop shell, likely a single valve, held in a human hand for scale. The shell exhibits a classic fan shape with prominent, rounded radial ribs (approximately 10-15 visible) and distinct concentric growth lines. The surface appears somewhat eroded or covered in sediment/algae, giving it a dull greenish-brown to dark brown coloration. This species is well-known from Miocene and Pliocene fossil deposits.
