Approximate shoreline of the East Coast 21,000 years ago. Source: USGS, 2003.
Approximate shoreline of the East Coast 21,000 years ago. Source: USGS, 2003.
Approximate shoreline of the East Coast 21,000 years ago. Source: USGS, 2003.
Approximate shoreline of the East Coast 21,000 years ago. Source: USGS, 2003.