Yorktown Formation
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The Yorktown Formation is a mapped bedrock unit in the Coastal Plain of Maryland, Virginia, North Carolina and South Carolina. It is overconsolidated and highly fossiliferous. Wikipedia
Extent: Maryland, Virginia, North Carolina, South Carolina
Sub-units: Sunken Meadow Member, Rushmere Member, Morgarts Beach Member, Moore House Member, Tunnels Mill Member
Unit of: Chesapeake Group