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Conglomerates and sandstones in the Lower Cretaceous Fortress Mountain Formation exposed on the northern flank of an anticline near the Siksikpuk River, north-central Alaska. Mountain in the distance is Castle Mountain, a syncline composed of Fortress Mountain Formation. Location ~130 mi. southwest of Prudhoe Bay.
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Conglomerates and sandstones in the Lower Cretaceous Fortress Mountain Formation exposed on the northern flank of an anticline near the Siksikpuk River, north-central Alaska. Mountain in the distance is Castle Mountain, a syncline composed of Fortress Mountain Formation. Location ~130 mi. southwest of Prudhoe Bay.