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Association of Statisticians of American Religious Bodies.
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The Exmore Channel, the oldest paleochannel dating back to 300,000-500,000 years ago, was the path of the combined Susquehanna and Potomac rivers east across the Continental Shelf.

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Again, sea levels rose, drowning the Continental Shelf and a portion of the Coastal Plain, creating yet another estuary at the mouth of the river. Longshore currents carried more sediments south from New York, New Jersey and Pennsylvania, and the Nassawadox Spit grew to the south of the Accomack Spit, extending the Delmarva peninsula.

former channels of Susquehanna River were obliterated, as growth of Eastern Shore extended length of Chesapeake Bay (green dots show current Susquehanna River and James River channels)Why did these ancient channels keep shifting to the west? As it grew fatter, it forced river channels to the west.

And why did the mouth of the Bay keep shifting to the south? As it grew longer, it forced each river to exit farther south.

To get around the barrier of the Accomack Spit, the mouth of the Belle Haven channel reached the Atlantic Ocean south of the old Exmore Channel, roughly at the latitude of today's Rappahannock River.

When sea levels rose again as ice sheets melted on the continents, an estuary developed at the mouth of the Belle Haven channel.