Ages of rocks in southwestern Washington and northwestern Oregon as indicated by paleontological and isotopic dates
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Abstract
This report presents a compilation of 1,019 paleontologic dates and 301 isotopic dates of rocks in southwestern Washington and northwestern Oregon. The study area extends from Portland, Oregon (latitude 45°30' N.) to Bellevue, Washington (latitude 47°35' N.) and from the east flank of the Cascade Range (longitude 121°20' W.) to the coastline (longitude approximately 124°00' W.). The data are presented in two tables and come from previous summaries of isotopic ages, open-file reports, published papers and maps, and theses. Parke D. Snavely, Jr. of the U.S. Geological Survey and Weldon W. Rau of the Washington Division of Geology and Earth Resources (WDGER) generously allowed us access to files and records of more than 40 years of micropaleontological research in western Washington and Oregon. We also present unpublished data from our research since 1971 in northwestern Oregon. This compilation was undertaken for the southwestern Washington and northwestern Oregon project of the U.S. Geological Survey Evolution of Sedimentary Basins Program.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Ages of rocks in southwestern Washington and northwestern Oregon as indicated by paleontological and isotopic dates |
| Series title | Open-File Report |
| Series number | 92-344 |
| DOI | 10.3133/ofr92344 |
| Year Published | 1992 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | Report: 115 p.; 2 Plates: 40.20 x 42.32 inches and 40.35 x 42.77 inches |
| Country | United States |
| State | Oregon, Washington |
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