Friday, September 7, 2018

Varves

Each set of dark and light lines is the leftovers of a glacial outburst


2 comments:

Cathlene Baugher said...

I saw a documentary about this... Like a huge ice dam that would break every few hundred thousand years.

lejernegan said...

There were glacial lakes all over the place. Ours stripped the Channeled Scablands and deposited all that soil in the Willamette Valley