It has been known for some time that double and multiple reflections have in many areas tended to confuse and, in some cases, override entirely the information that was intended to be recorded. As Mr. Ellsworth has pointed out, the Chico region in the Sacramento Valley is one of these areas. Conditions there are quite good for the development of multiple reflections because of the near-surface layer of basalt which acts as an excellent primary reflector, and the presence of a thin and uniform weathered layer in combination with a regular topography.

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