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I always like this southside view; such great rock geology.
The Deem Hills Preserve is primarily composed of Precambrian Era granite and Tertiary Period basalt.
The black boulders of basalt are remains from historic lava flows from volcanic activity FROM CURRENTLY DORMANT VOLCANOES NEAR FLAGSTAFF. These 1.6 million year old lava flows broke through the earth's surface in this area. The other adjacent mountains of black basalt found in the area were also created by ancient volcanoes of northern Arizona.
The rocks found in the Deem Hills Preserve were prized by native Hohokam people for hundreds of years. The basalt was especially useful for tools like manos and metates, which are stones commonly used for grinding grains into flours. They were also shaped into hammers and axes.
The chalcedony (pronounced kal-sed-nee) is a white rock used for arrowheads, knives, and scrapers. This rock was highly coveted and was more than likely used for trading purposes.
The Deem Hills Preserve is primarily composed of Precambrian Era granite and Tertiary Period basalt.
The black boulders of basalt are remains from historic lava flows from volcanic activity FROM CURRENTLY DORMANT VOLCANOES NEAR FLAGSTAFF. These 1.6 million year old lava flows broke through the earth's surface in this area. The other adjacent mountains of black basalt found in the area were also created by ancient volcanoes of northern Arizona.
The rocks found in the Deem Hills Preserve were prized by native Hohokam people for hundreds of years. The basalt was especially useful for tools like manos and metates, which are stones commonly used for grinding grains into flours. They were also shaped into hammers and axes.
The chalcedony (pronounced kal-sed-nee) is a white rock used for arrowheads, knives, and scrapers. This rock was highly coveted and was more than likely used for trading purposes.