Geology of Magnesite Deposits in Northern Okanogan County, Washington


Book Description

A study of magnesite-bearing rock that crops out as irregularly shaped lenses, 50 by 1, 000 feet in maximum dimension, within a narrow stratigraphic zone at the base of a Triassic sequence at its contact with Permian rock.
















U.S. Geological Survey Bulletin


Book Description













Phosphate Rock in Colombia


Book Description