URL details: patnealwildlife.net/olympic-peninsula-timeline/
URL title:
Olympic Peninsula Timeline | Pat Neal Wildlife
URL description:
History of Olympic Peninsula timeline to 1900. Corrections and additions welcome. 55 to 15 million years before present (YBP): Undersea deposits of sandstone, shale and basalt form what would become the Olympic Peninsula YBP: Six separate glacial periods advance and retreat across the Olympic Peninsula. From 70,000 to 60,000 YBP and from 16,500 to 11,000 YBP:
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