I didn't see that in the article; did I miss it, or is that knowledge that you bring to the table? I'm reasonably certain they intended to show the extent of inland flooding. Is the whitish area analogous to some ancient shoreline? I'm only familiar with the "fall line" separating the Piedmont and coastal plain regions in NC, SC and VA, which I understand is believed to have been the shore, long ago. But, from what I can tell, this is going inland well past the fall line in most areas of NC and SC at least. Also, I understand 65M as 65,000 (same as 65K), since I'm in the printing industry. 65,000,000 would be 65MM. You did mean millions and not thousands, correct?
Yes I did mean Mega, not kilo.
As for the shorelines I believe that what I said is correct. Gimme a few to verify?