David E. Detra J. Thomas Dutro 1978 <p>More than 1400 m of fine-grained clastic rocks and reefoid limestones constitute the lower part of an Upper Devonian transgressive-regressive cycle in the central Brooks Range, Alaska (Dutro and others, 1977). The Hunt Fork Shale and an underlying heterogeneous unit (unnamed) were measured and sampled on the east side of the upper Beaucoup Creek in the Philip Smith Mountains A-1 quadrangle (secs. 17, 19, and 20, T. 14 S.,<br>R. 20 E.) (Brosge and others, 1977).</p> application/pdf 10.3133/ofr78559 en U.S. Geological Survey Analyses of rock samples from the Hunt Fork Shale and related Upper Devonian rocks, Philip Smith Quadrangle, Arctic Alaska reports