The Navajo Nation comprises the largest land area and the largest population of any Native American community in the United States, and it hosts some of Earth's most spectacular geology. Geologic resources and environmental concerns have figured prominently in the Navajo Nation's recent history and economy. Despite the traditional cultural ties of the Diné (Navajo) people to their land, and the natural curiosity of most K-12 students about the earth, geoscience courses are virtually absent from curricula in Navajo Nation public schools. Many native-born teachers are familiar with the landscape and its cultural geography, but few have received formal training in geology and are not comfortable introducing it into their classrooms. A collaborative project between the U.S. Geological Survey and Navajo Community College has addressed this issue on a local scale by developing a classroom and field- intensive one-week summer course for Navajo Nation teachers with no previous geologic experience. The course introduced basic geologic principles, regional geology, and environmental issues and guided teacher participants in the preparation and assembly of their own comprehensive geologic teaching kits, which included local and exotic rock and mineral specimens, fossils and fossil replicas, maps, and geologic and environmental-science field gear.