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Map showing high-purity quartzite in California, Nevada, Utah, Idaho, and Montana Map showing high-purity quartzite in California, Nevada, Utah, Idaho, and Montana
Unusually pure quartzite of Ordovician age crops out in hundreds of places from Owens River, California to southwestern Montana. It constitutes a single lithologic type that is called the Kinnikinic Quartzite in central Idaho, the Swan Peak Quartzite in southeastern Idaho and adjacent parts of Utah, and the Eureka Quartizite in western Utah, Nevada, and southern California.
Map showing outstanding natural and historic landmarks in the greater Denver area, Front Range Urban Corridor, Colorado Map showing outstanding natural and historic landmarks in the greater Denver area, Front Range Urban Corridor, Colorado
The preservation and protection of landmarks of outstanding natural and historical significance has become a matter of increasing public concern as man's ability to alter the landscape has increased. Congress expressed its concern in 1969 in its passage of the National Environmental Policy Act. The purpose of this report is to identify and inventory such landmarks. Appropriate...