Chisago County, Minnesota: Chisago Lake Township, Chisago County, Minnesota, Lindstrom, Minnesota, Rush City, Minnesota, Amador

Chapters: Chisago Lake Township, Chisago County, Minnesota, Lindstrom, Minnesota, Rush City, Minnesota, Amador Township, Chisago County, Minnesota, Rushseba Township, Chisago County, Minnesota, Center City, Minnesota, Stacy, Minnesota, Taylors Falls, Minnesota, North Branch, Minnesota, Chisago City, Minnesota, Lent Township, Chisago County, Minnesota, Fish Lake Township, Chisago County, Minnesota, Wyoming Township, Chisago County, Minnesota, Sunrise Township, Chisago County, Minnesota, Nessel Township, Chisago County, Minnesota, Shafer, Minnesota, Franconia Township, Chisago County, Minnesota, Shafer Township, Chisago County, Minnesota, Harris, Minnesota, Wyoming, Minnesota, Interstate Park, Wild River State Park, National Register of Historic Places Listings in Chisago County, Minnesota, Almelund, Minnesota, Chisago Lakes, Center City Historic District, Sunrise River, Wild Mountain. Excerpt: Interstate Park - Wikipedia, the free encyclopedia 1.1 billion years ago, a series of volcanic eruptions from the failed Midcontinent Rift System sent at least ten separate lava flows across the region that now includes Interstate Park. These flows hardened into basalt, which fractured at several joints . In the Cambrian period, Between 530 and 470 million years ago, the region was covered by a shallow sea which deposited sandstone and siltstone atop the basalt. This epoch of the Cambrian, the Furongian, was originally called the Croixian in North America because the layers exposed in this area were its type locality. At the end of the last glacial period 10,000 years ago, torrents of water flowed south from the melting glaciers, carving the St. Croix River Valley. The soft Cambrian sediments were easily eroded into a wide valley, but the hard basalt was resista... More: http://booksllc.net/?id=2798261