On the Trail of the Ice Age Floods: A Geological Field Guide to the Mid-Columbia Basin

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During the last great Ice Age that ended some 15,000 years ago, the Pacific Northwest was repeatedly decimated by cataclysmic floods unlike anything of modern times. Giant ancient lakes such as Glacial Lake Missoula were created as lobes of the massive ice sheets blocked river valleys. These “ice dams” broke time and again over the millennia, sending walls of ice-laden water, miles wide and hundreds of feet deep, racing over the land at speeds up to 80 mph – scouring a fantastic landscape and leaving a fascinating geologic record for us to wonder at today.

Now geologist Bruce Bjornstad has written the most comprehensive guidebook yet to the incredible landforms scoured out by the Ice Age floods in the Mid-Columbia Basin. His book, On the Trail of the Ice Age Floods: A geological field guide to the Mid Columbia Basin explores the origins, timing, and frequency of the Ice Age floods and describes each of 19 geologic features they left behind. It is also an exciting field guide to features, trails, and tours in the Mid-Columbia Basin where we may witness today the awesome power of the ancient floods.