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The Eagle A-l and A-2 quadrangles are underlain primarily by strongly deformed metamorphic rocks. These consist of a unit of amphibolite facies rocks and two units of greenschist facies rocks. The age of the metamorphic rocks is unknown, but some of them are Paleozoic. Mesozoic granitic rocks intrude the metamorphic rocks, and a mass of serpentinized ultramaflc rock of Paleozoic or Mesozoic age also appears to be intrusive. Sedimentary rocks of Tertiary age unconformably overlie the metamorphic rocks in three localities. Basalt was erupted after the early Tertiary rocks were deposited. The Fortymile River and its tributaries are entrenched, and terraces as high as 500 feet above the present streams are conspicuous, particularly along the South Fork. Erosion and altiplanation are suggested as the processes which formed the relatively uniform surfaces in the southeastern part of the A-l quadrangle. Gold placer mining continues on a small scale on several streams. Little new ground for placer mining remains except on the high terraces.

Reconnaissance geology of the Eagle A-1 and A-2 quadrangles, Alaska