The Virginia Fall Line
Posted: Wed May 07, 2008 12:45 pm
I was talking to a buddy of mine today about the James River blue catfish situation, apparently it has been reported in a local paper...I still need to dig that up and read it...
Anyway, the discussion turned to the "definition of the Virginia Fall Line". Now, I had a misconception about the Fall Line. I thought that it was the pretend line in each river of the Piedmont where the state had officially called it "This side of the line is brackish/salt water - the other side of the line is fresh water". Well, the State (or Commonwealth, really) has made that determination, but it isn't related at all to the term "Fall Line" like I thought it was.
The fall line is actually the point in the Virginia Piedmont at which the hard bedrock of the Appalachian mountain ridge gives way to softer bedrock of the piedmont. This softer bedrock erodes away easier and thus water falls have developed there and it marks the start of the deeper water of the Potomac, Rappahannock and James Rivers.
More very interesting information about this topic can be found at the following website...
http://www.virginiaplaces.org/regions/fallshape.html


Anyway, the discussion turned to the "definition of the Virginia Fall Line". Now, I had a misconception about the Fall Line. I thought that it was the pretend line in each river of the Piedmont where the state had officially called it "This side of the line is brackish/salt water - the other side of the line is fresh water". Well, the State (or Commonwealth, really) has made that determination, but it isn't related at all to the term "Fall Line" like I thought it was.
The fall line is actually the point in the Virginia Piedmont at which the hard bedrock of the Appalachian mountain ridge gives way to softer bedrock of the piedmont. This softer bedrock erodes away easier and thus water falls have developed there and it marks the start of the deeper water of the Potomac, Rappahannock and James Rivers.
More very interesting information about this topic can be found at the following website...
http://www.virginiaplaces.org/regions/fallshape.html

