[1] The Kreyenhagen Hills form a long foothill belt in the soft formations between Reef Ridge and Kettleman Plain.

The ridges are slightly asymmetric, the northeast flank being a dip slope and fairly smooth, while the southwest flank is a steeper, strike face that is in many places eroded so as to leave sharp gullies and conical intermediate ridges extending outward.

The greatest symmetry of the parallel ridges appear's in the portion of the Kreyenhagen Hills between Jacalitos Creek and Big Tar Canyon, and there the long, straight, smooth troughs between the ridges doubtless gave rise to the name Canoas, meaning trough, applied to Canoas Creek which passes across the central portion of the hills.

In the groups of hills between the other streams farther south such a feature is not so clearly to be made out, but it is true that the course taken by the drainage is predominantly toward the southeast.

Prominent individual features are absent, and the foothill area is a rolling surface with low ridges and broad drainages sloping gradually toward and merging with the Kettleman Plain.