Abstract

WORK OF WIND IN NORTHERN LAKE COUNTY, OREGON

BY IRA S. ALLISON

Deflation on the floor of an extinct Pleistocene lake in the Fort Rock-Christmas Lake-Fossil Lake basin of northern Lake County, Oregon, has developed several basins in the lake sediments having depths of tens of feet and lengths of several hundreds of feet. Part of the material removed is piled up on the leeward rims. Post-lacustrine pumice, probably in part at least the eastward extension of the Crater Lake pumice field, has also been piled up in long transverse dune ridges. In the Fossil Lake sector lake beds have been wind-cut over an extensive area, and a leeward train of dunes of varying forms has been blown across country as much as 12 miles.

SUBDIVISIONS OF THE CHICO SERIES

BY FRANK M. ANDERSON

The major stratigraphic groups of the Chico series—Pioneer, Panoche, and Moreno—can each be subdivided . . .

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