C.A. Hickcox Clyde Wahrhaftig 1953 <p>The Jarvis Creek coal field lies on the north side of the Alaska Range between latitudes 63<strong>°</strong>35' and 63<strong>°</strong>45 N., and longitudes 145<strong>°</strong>40' and 145<strong>°</strong>50 W. It is 2 to 6 miles east of the Richardson Highway. The coal field is about 16 square miles in area, the major part of which is a rolling plateau that slopes gently northward and is bounded on the east, south and west, by bluffs facing Jarvis Creek, Ruby Creek and Delta River.</p><p>The oldest rock is pre-Cambrian Birch Creek schist, which is largely quartz-sericite schist with many quartz veins, and is locally intruded by rhyolite dikes. it is overlain by the Tertiary coal-bearing formation. Quaternary deposits include gravel, till, solifluction debris, and wind-borne deposits.</p> application/pdf 10.3133/ofr53263 en U.S. Geological Survey Geology and coal deposits of Jarvis Creek coalfield, Alaska reports