As geologist on the 1935 archeological expedition of Dr. Frederica de Laguna to the lower Yukon Valley, the writer enjoyed the opportunity to study the unconsolidated sediments and topographic features of the region. In order to direct the search for prehistoric habitations the Pleistocene and recent erosional and depositional activity of the Yukon was particularly investigated.

The field work began at Nenana, but the trip down the Tanana River to Tanana Station was negotiated quickly and served chiefly to acquaint the writer with the nature of the problem. Systematic observation and sampling began first at Tanana Station. As the cut banks of the rivers furnish the best and commonly the only exposures of the unconsolidated deposits, the small river skiffs which conveyed the expedition provided convenient means of measuring, sampling, and tracing for long distances each conspicuous sediment type. Only occasionally did side trips lead farther away from the . . .

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