About 300 million years back An additional oscillating sea protected the world forsaking layers of shale and limestone. Then, about 1,000,000 years ago, glaciers moved down from the north. The Kaw River roughly parallels the southernmost tip of the most recent glacier, which covered most of North The united states https://elliottucgoo.spintheblog.com/29887047/moonrocks-kaws-an-overview