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The area along the final 100 miles of the Alaska Highway lies in the middle section of the Tanana lowland and includes parts of the Yukon-Tanana upland on the northeast and the Alaska Range on the southwest. The major bedrock units, mostly exposed in the mountains and hills, are the Birch Creek Schist, regarded as Precambrian; granitic rocks of Cretaceous age; and volcanic rocks of Tertiary age. Very small exposures of lower Tertiary shale, sandstone, and conglomerate crop out along the Tanana River near Tok Junction; a small bed of Nenana Gravel of middle Miocene age or younger lies on the north end of Independent Ridge; and thick but limited carbonaceous silt and clay beds of upper Tertiary age lie along a tributary of the Johnson River. Most of the Tanana lowland and of the piedmont of the Alaska Range is covered by glacial and alluvial deposits. The most conspicuous glacial deposits are the large, well-preserved moraines at the mouths of the major tributaries of the Tanana River. Spreading northward from these moraines are outwash plains that coalesce laterally with alluvium from nonglacial streams to form extensive fan aprons. Most fan aprons are composed of rocks from the Alaska Range, but the fan in the Tok Junction area contains large percentages of volcanic rocks which are not abundant locally. Smaller moraines occur in tributary valleys and in cirques. Two major Pleistocene glaciations are indicated by moraine sequences, which are correlated with the Delta and Donnelly advances of the Delta River area. Other surficial deposits of considerable areal extent are the terrace sediments of the Tanana River and its major tributaries and the eolian loess, which covers nearly all other deposits and rocks. Alluvial silt, eolian sand, colluvium, organic silt, and flood-plain alluvium are also widespread but are mainly confined to valleys. Rubble and talus are of limited extent, occurring at high altitudes in the mountains.

Geologic reconnaissance along the Alaska Highway, Delta River to Tok Junction, Alaska