Imagine what it was like when the
Bosphorus Strait breached and the Black Sea filled.
I came back to add this. National Geographic had an article about the history of the MIssissippi promoted on Digg.com, but when I went there they wanted an email address to read the article. Ain't nobody got time....
Here's a similar picture of the Willamette Valley showing LIDAR imaging of the meanders with time
Willamette River Historical Stream Channels – Hidden Hydrology