Geology and coal deposits of Jarvis Creek coalfield, Alaska
The Jarvis Creek coal field lies on the north side of the Alaska Range between latitudes 63 ° 35' and 63 ° 45 N., and longitudes 145 ° 40' and 145 ° 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. 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.
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