About 300 million years back Yet another oscillating sea covered the region forsaking layers of shale and limestone. Then, about 1,000,000 years back, glaciers moved down from the north. The Kaw River around parallels the southernmost tip of The newest glacier, which covered almost all of North America about 600,000 https://kawsmoonrocks32974.weblogco.com/29591097/kaws-moon-rocks-box-for-dummies