Look for Finger Rock pointing the way to Fairbanks. Rumor has it that early bush pilots in the area used this 40-foot granite rock as a navigation guide. Finger rock is actually a geologic formation called a tor. Tors are rock formations caused by weathering; in this area, the extreme freezing and thawing of the ground causes the rock to be pushed up into these dramatic formations. There are several tors visible in this area; Finger Rock is the most prominent and impressive of these outcroppings.