 Hundreds of miles to the west Alaska Highway 3 runs along the western side of the Talkeetna range, with the Alaska Range directly west.Alaska Highway 1, running along the southern front of the Talkeetna Mountains, lies mainly in a valley marking a tectonic divide between the Jurassic and Cretaceous rocks of the accretionary wedge, island-arc, and basement rocks in the Peninsular terrane (and other terranes forming the Talkeetna Mountains), and the Chugach Mountains in the Chugach terrane to the south.The range stretches as much as a hundred miles north to south.