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| (A) | (B) |
Figure 4.
Mapped geology (A; simplified from Drewes, 1971) and magnetic anomalies (B) in Santa Cruz Valley, Arizona, USA (Gettings, 2002). High amplitude magnetic anomalies correlate with mapped intrusive rocks (e.g., anomalies labeled A, B, C, and D) and indicate the presence of additional intrusive rocks under sedimentary and volcanic cover (e.g., anomalies labeled 1, 2, and 3). See Gettings (2002) for additional detail; this figure is greatly simplified.