[exnavy]

They used to teach this in sixth grade science class.

[fidelis]

They used to teach this in sixth grade science class.

Exactly. You can today go to the top of mountain ranges in the American West and other places and find the marks of glaciers as they moved across the continent when these mountains were young pups.

[Tell It Right]

Agreed. Since forever until climatology was horribly politicized in the 1990's, we've been talking about these relatively small climate cycles that last about 1,000 years each:

Occurring within these larger cycles that last roughly 100,000 years each:

Occurring within these even larger cycles that last roughly 100,000,000 (100 million or so) years each:

[Chickensoup]

Yes I remember this from grammar school

when you do not educate a couple of generations all is forgotten and they can be manipulated

[jimtorr]

They used to teach this in sixth grade science class.

Yes, I was taught this in school also. This study may have found real evidence of it in Colorado. Solid evidence of the snowball-earth theory has been missing before this, I think.