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Robertson pit (Robertson Quarry), Dayton, Mason Co., Washington, USA

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Latitude & Longitude (WGS84): 47° 11' 30'' North , 123° 16' 23'' West
Latitude & Longitude (decimal): 47.1919444444, -123.273333333

A traprock quarry in Eocene submarine pillow basalt of the Crescent formation. Owned by Simpson Timber Co., Shelton, WA. Located 3.5 miles SW of Dayton.

Mineral List

5 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Lasmanis, R. (1988) Minerals of the Crescent Formation, Robertson Pit, Mason County, Washington. Rocks & Minerals, V 63, pp. 24-28.

Tschernich, R.W. (1989) Notes on the zeolites from the Robertson Pit, Dayton, Mason County, Washington. Micro Probe, V 6, No. 8, p. 15.

Tschernich, R.W. (1992) Zeolites of the World. Geoscience Press, Phoenix, Arizona.

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