The northeast Strawberry Valley Quadrangle includes approximately 250 square miles of the area where the south-central Wasatch Mountains join the southwest flank of the Uinta Mountains, and form the northwest boundary of the Uinta Basin. This region is contiguous on the west to the Duchesne River area, mapped by Huddle and McCann, and is directly east of the south-central Wasatch Mountains, mapped by Baker.

The stratigraphic sequence in this quadrangle aggregates approximately 43,435 feet, and consists of 24 formations, most of them marine. One is Pennsylvanian, one Pennsylvanian and Lower Permian, three are Permian, five Triassic, five Jurassic, six Cretaceous, one Upper Cretaceous and Paleocene, one Eocene, and one Miocene (?). In addition, a variable thickness of Eocene and Oligocene volcanic material is present locally. Pleistocene drift and Recent alluvium lie on older rocks. Structural adjustments, however, have juxtaposed a western against an eastern facies in the Paleozoic and Mesozoic strata. Difference of thickness of individual units as well as lithologic variation characterize this two-fold facies.

Structurally the northeast Strawberry Valley Quadrangle has significance, for it is situated at the locus of the east-west trending Uinta Mountains and the north-south Wasatch Mountains. The boundary separating these differing structural units lies in the central part of the mapped area and is represented by an overthrust of low west dip and large east slip. Overfolded strata of the south-central Wasatch Mountains have been thrust some tens of miles eastward upon flat to gently inclined strata of the southwest Uinta Mountains. This orogeny was followed by uparching and possible rampthrusting south of the Uinta Mountains, downwarping of the north side of the Uinta Basin, and tilting of the early thrust plate. These structural features were various pulses of the Laramide orogeny. They w re followed by normal faulting of Tertiary age within the quadrangle, arch collapse of the Uinta Mountains, and further accentuation of the asymmetry of the Uinta Basin Tertiary syncline. Since that time epeirogenic uplift and erosion have imparted to the area the form and proportion much as they are seen to-day.