Stratigraphic section, Black Mesa area, northeastern Arizona

Stratigraphic section showing rock formations and hydrogeologic units of the Black Mesa area, northeastern Arizona (not to scale). The N aquifer is approximately 1,000 feet thick.

Figure 2 from: Mason, J.P., and Macy, J.P., 2018, Groundwater, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona—2015–2016: U.S. Geological Survey Open-File Report 2018–1193, 60 p.