Inner Gorge of the Grand Canyon

Location #1. Here, the Cambrian Muav Limestone overlies the Cambrian Bright Angel Shale. Like all the contacts on this map between the different Paleozoic rock units (light greens to pinks to purples), the contacts follow the contour lines, indicating that they are nearly horizontal.

Location #2. This contact, between Precambrian biotite schist (olive green) and the Precambrian Zoroaster Granite, runs straight across the Colorado River with no deflection to indicate it is vertical.

Location #3. Another vertical contact (it goes right across the river with no deflection). This one's between the Biotite Schist (olive green) and the Vishnu Schist (gray).

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