Located in Gunnison, Colorado – also a National Park. Approximately 2700 feet at greatest depth. 48 miles in total length. Received its name the “Black Canyon” due to the lack of sunlight on the bottom from the steepness of the canyon.
Composed of metamorphic rocks – gneiss and schist. Gneiss – extreme temperature and pressured metamorphic rock, almost to the point of melting. Schist – very thin, paper-like layers of metamorphicrock with strong foliation. Composed of igneous rocks – quartz monzonite and pegmatite. Quartz monzonite – type of granite, formed from magma that contains a lot of silica. Pegmatite – type of granite, consisting of quartz, feldspar, and mica.
Volcanic activity Erosion Uplift The Gunnison River Itis stated that rock from the Precambrian era is still existent in the Black Canyon. Chemical weathering, frosting, rock falls, landslide movements, etc. all responsible for creating the depth of the canyon.
1. During the Gunnison Uplift, a huge section of the Earth’s crust was forced upward.2. Erosion took over the new formation and weathered every exposed surface.3. Volcanic eruptions accumulated layers, upon layers of rock.4. Gunnison River became habitual, more erosion took place, creating the steep, narrow canyon.