{"product_id":"roadside-geology-of-minnesota","title":"Roadside Geology of Minnesota","description":"You may have heard that Minnesota�s ten thousand lakes are the hoofprints of Paul Bunyan�s big blue ox, Babe. �Don�t you believe it!� writes author Dick Ojakangas. Though the lakes, which formed at the end of the most recent ice age, may be Minnesota�s most famous features, the glaciated countryside disguises a much longer history of volcanoes and plate collisions�not surprising when you learn that Minnesota was at the active edge of the fledgling North American continent for several billion years.\u003cbr\u003e\u003ci\u003eRoadside Geology of Minnesota\u003c\/i\u003e steers you over glacial moraines and till plains to some of the state�s unparalleled geologic features, such as the Morton Gneiss, once thought to be the oldest rock on Earth; the St. Peter Sandstone, one of the purest sandstones in the world; the banded iron-formation, the source of iron for the Great Lakes steel industry; and the ancient shorelines of Glacial Lake Agassiz, one of the largest glacial lakes ever to have existed in North America. The book�s introduction presents an overview of Minnesota�s geologic history, and forty-two road guides discuss the landforms and rocks visible from a car window and at nearby waysides and parks, including Pipestone National Monument, Grand Portage National Monument, and Voyageurs National Park.\r","brand":"Richard W. Ojakangas","offers":[{"title":"Paperback","offer_id":44441759613164,"sku":"9780878425624","price":26.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0684\/1791\/3068\/files\/9780878425624.jpg?v=1720429464","url":"https:\/\/allstora.com\/products\/roadside-geology-of-minnesota","provider":"Allstora","version":"1.0","type":"link"}