Geology Annex (U.S. Forest Service Building)
Northern Arizona University built the Geology Annex in 1967 for U.S. Forest Service (USFS) research. From 1967 to 1992, NAU referred to the building as either the Rocky Mountain Forest and Range Experiment Station or the Forestry Science Labs. USFS used the Annex to research local forest and range management problems.
In 1992, the Forestry Science Labs began housing faculty offices for the Geology Department and USFS moved to the new Southwest Forest Science Complex on south campus. As of 2015, the Geology Annex houses faculty offices, a seminar room, and research laboratories for the Geology Department.
The building's architectural style reflects both a modern International style and a Craftsman-style north entrance. The Geology Annex features plate-glass windows, Roman brickwork, and spandrel panels.