National Geologic Map Database
General Information
- Title: New molluscan assemblages from the upper member of the Twin River Formation, western Washington: significance in Neogene chronostratigraphy
- Author(s): Addicott, W.O.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Journal of Research of the U.S. Geological Survey V.4-4
- Publication Date: 1976
- Map Scale: 1:117,600
- Cross Section: None
- North Latitude: 48° 16' 59" N (48.2830)
- South Latitude: 48° 7' 59" N (48.1330)
- East Longitude: 124° 1' 12" W (-124.0200)
- West Longitude: 124° 20' 17" W (-124.3380)
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