House Mountain is a shield volcano located in the U.S. state of Arizona located between the Sedona Red Rock Country and the Verde Valley in the Coconino National Forest. House Mountain erupted approximately 13-15 million years ago on the edge of where the Mogollon Rim stood at that time. Thus, the basalt that was emitted preserved the sedimentary layers below it, including the Schnebly Hill Formation and the thin band of Fort Apache Limestone. The Mogollon Rim has receded at a rate of 1 foot per 600 years since and the current edge of the rim can be seen several miles away from the summit.