In 120 hours of recording in October 1968, nineteen small earthquakes were found on the fault system associated with Geysers steam zone in Sonoma County, California. These earthquakes, as distinguished from steam‐generated seismic noise, provide further evidence of the genetic relationship between the two phenomena and suggest that the mapping of microearthquakes could be used in the exploration for geothermal power.
The Grand Canyon in northwestern Arizona has long been a favorite area of study for geologists from all parts of the world, but until recently little intensive archaeological work has been done within the canyon itself. In 1953 the senior author began to investigate Cataract Creek Canyon, the only major drainage leading from the Coconino Plateau on the south to the Colorado River. Also in this year Walter W. Taylor (1954) made a quick survey of the lower reaches of the Grand Canyon by boat, but due to high and fast water he was unable to locate many sites. The present project was the first major excavation to be carried on in the main canyon area and it revealed material that should stimulate further work in the region.
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