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Bibliography of Reports Resulting from U.S. Geological Survey Participation in the United States Technical Assistance Program, 1940-65
Jo Ann Heath
Leopold Alexander Heindl
出版
U.S. Government Printing Office
, 1965
URL
http://books.google.com.hk/books?id=7KTQ_biUezkC&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN
註釋
A conformable late Pleistocene sequence of interglacial and glacial sediments in the Seattle area, Washington, can be divided into three units: a lower, unnamed nonglacial unit; a middle unit, the Lawton Clay Member of the Vashon Drift; and an upper unit, the Esperance Sand Member of the Vashon Drift. Radiocarbon dates from the lower unit indicate that the Puget glacial lobe of the Vashon age advanced into the area at some time after 15,000 years ago - several thousand years later than was previously believed.
