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Eastward view from the upper Fortress Mountain Formation (Aptian-Albian) near the eastern end of Atigun Gorge. Dark rocks near base of gorge (lower-right) are Neocomian Okpikruak Formation. In distance, Paleozoic rocks including Lisburne Group carbonates (highest peaks) form the tectonic front of the Brooks Range. Curious female Dall sheep for scale. Location about 125 miles south of Prudhoe Bay.
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Eastward view from the upper Fortress Mountain Formation (Aptian-Albian) near the eastern end of Atigun Gorge. Dark rocks near base of gorge (lower-right) are Neocomian Okpikruak Formation. In distance, Paleozoic rocks including Lisburne Group carbonates (highest peaks) form the tectonic front of the Brooks Range. Curious female Dall sheep for scale. Location about 125 miles south of Prudhoe Bay.