Download or read book Northwest Exposures written by David D. Alt and published by Mountain Press Publishing Company. This book was released on 1995 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: The tale of the Northwest's geology began more than two billion years ago when an ancient continent split, creating oceanfront property in what is now western Idaho. Pacific islands mashed into that coastline, making large parts of Washington and Oregon.