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Big Tree Creek, Yacolt, Clark Co., Washington, USA

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Latitude & Longitude (WGS84): 45° 52' 28'' North , 122° 21' 40'' West
Latitude & Longitude (decimal): 45.8747131628, -122.361271185

Zeolites are abundant in boulders scraped off the top of an Eocene basalt flow in order to make the logging road along Big Tree Creek, 3.8 miles east of the railroad tracks in Yacolt, Clark County, Washington. Boulders and dirt was piled along the south side of the road and into the trees making finding the boulders and collecting in them difficult. No rock cut was found containing the same mineralization. The site was found by Jim Babcock of Vancouver, Washington and was made known to other collectors by Vi Frazer. Like most logging roads, the area is closed to collecting and gated.

Rudy Tschernich

Mineral List

12 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.


Tschernich, R.W. (1988) The occurrence and origin of silica rich and silica poor zeolites at Big Tree Creek, Yacolt, Clark County, Washington. Micro Probe, V 6, No. 7, pp. 6-16.

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

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