At what period in time did this green Greenland occur next to a frozen NA?
Hint: Saying a million years ago, especially with no link, is not proof of your claim.
LOL!!!
Yes, proven is the fact that Greenland's ice age began no more than 800k years ago. Then the question becomes the timeline of the NA ice age.
Indiana Geological Survey - Ice Age in Indiana
"Geologists also refer to this time as the Pleistocene, a formal period of geologic time that began 2 million years ago and technically ended 10,000 years ago. "
The above map shows what every other map of the North American ice age shows, glaciers all over Canada down to Indiana etc. What is WRONG with this is, of course, the fact that GREENLAND was NOT FROZEN during that time, especially since the map fails to recognize tectonic movement...