Clatsop Spit is an unusually large sand spit on the Pacific coast along U.S. Route 101 between Astoria and the north end of Tillamook Head in Clatsop County, northwest Oregon, at the mouth of the Columbia River. The Clatsop Spit was formed by sediment brought to the coast by the Columbia River after the last ice age ended and the ocean level rose approximately 8,500 years ago. Here it was worked over and shaped by the wind and the waves until a vast and sandy plain was formed.[1] In regular conversation, referring to Clatsop Spit usually refers to the northern end of the spit: the area that is bound by the Pacific to the west and the Columbia River to the northeast. In the past, the spit was known as Clatsop Sands.[2]
- ^ David D. Alt; Donald W. Hyndman (2004). Roadside Geology of Oregon (18th ed.). Missoula, Montana: Mountain Press Publishing Company. pp. 82–85. ISBN 0-87842-063-0.
- ^ Scientific American, Volume 103 - 1910. Munn & Company. 1910. Retrieved 2016-04-22.