Figure 4. Timing of volcanic events in the SVF is constrained by mapped stratigraphic relationships, rock magnetic polarity, and radiometric ages. Here a geologic map of part of the Morgan Mountain area is shown (Condit, 1995) as an example of the stratigraphic relationships used to constrain the age range of each eruptive unit. See text for examples. Map units are colored by lithologic type (see Figure 3). The paleomagnetic time scale is shown (red - reversed polarity time intervals, green - normal polarity time intervals).

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