Final answer:
Black Canyon has steep, jagged walls formed from ancient metamorphic rocks like gneiss and schist. Unaweep Canyon's cross-sectional profile is not specifically described, but it may differ based on its geological history and dominant rock types. The cross sections of canyons depend on local rock formations and erosion processes.
Step-by-step explanation:
Unaweep Canyon and Black Canyon are both striking geological formations, but they feature significantly different cross-sectional profiles due to the types of rock formations and geological history. In Black Canyon of the Gunnison National Park, the walls consist primarily of Precambrian rock nearly 2 billion years old, with the most dominant types being gneiss and schist. These metamorphic rocks have undergone extreme pressures and temperatures, resulting in the intensely folded appearance, featuring alternating light and dark bands. This suggests that the cross section of Black Canyon would show steep, jagged walls and narrow gorge.
Comparatively, descriptions or graphical representations of Unaweep Canyon's geology are not provided in the reference material. Nevertheless, canyons generally display unique geological characteristics that can range from broad, flattened valleys to steep, narrow gorges depending on the dominant rock types and erosion processes involved.
Without specific details on Unaweep Canyon, we can only conjecture that if it contained, for example, layers of sedimentary rock such as those seen in the cross-bedding of ancient sand dunes in Coyote Gulch, it may have a more varied and less uniformly steep profile compared to the Black Canyon's metamorphic rock walls. Additionally, the presence of a feature like the Great Unconformity would indicate a history of erosion and deposition significantly different from that of Black Canyon.