Figure 5A. Pseudotachylyte. Notice that thin bands of pseudotachylyte formed along the two fault surfaces. At the same time, the rock between the two faults was broken apart, allowing the molten rock to be injected as a fluid, which instantly froze in place. The angular rock fragment to the upper right was engulfed, and the molten rock fluid shot through the irregular channelway to the upper left. This is dramatic evidence for ancient earthquake-producing sudden fault motion. Remove highlights. (Photo by Henry Berry, Maine Geological Survey)

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Last updated on April 26, 2007

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