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Rockhound Gulch (Denny Creek), Denny Mountain, King Co., Washington, USA

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Much higher into the Rockhound Gulch - this is NOT an easy hike!

Rockhound Gulch, Denny Mountain, King Co., Washington, USA
Much higher into the Rockhound Gulch - this is NOT an easy hike!

Rockhound Gulch, Denny Mountain, King Co., Washington, USA
Latitude & Longitude (WGS84): 47° 25' 2'' North , 121° 26' 26'' West
Latitude & Longitude (decimal): 47.41722,-121.44056
Köppen climate type:Csb : Warm-summer Mediterranean climate

NOTE: This locality is now closed to collecting. Here are Bob Jackson's description of Rockhound Gulch:
""To reach Rockhound Gulch, take the Melakwa Lakes trail no. 1014. You will start on the west side of Denny Creek, cross to the east side via a large hewn log bridge, cross back to the west side where the trail descends a bank to a rock crossing. After this second crossing, the trail switchbacks up a hill, then comes back close to the creek canyon. At this point you will have a wide view of the cliffs of Low Mountain (5000') on your left. Just after you see this view, the trail turns left, and a poor trial goes off the right side down into Denny Creek canyon, across a flat rock outcrop above a waterfall, to a rocky-bottomed canyon up the side of Denny Mountain. This is Rockhound Gulch."
Bob Jackson (1974) Rockhound's Guide to Washington

*Cannon, B. (1975): Minerals of Washington, p.82,85

Mineral List

10 valid minerals. 1 erroneous literature entry.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

0 - 2.588 Ma

ID: 1386214

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Sand,gravel

Reference: Washington State Department of Natural Resources, Division of Geology and Earth Resources. Washington Interactive Geologic Map: 1:100,000 scale. Washington Division of Geology and Earth Resources. [19]

Rupelian - Eocene
28.1 - 56 Ma

ID: 2939930
Eocene nonmarine rocks

Age: Paleogene (28.1 - 56 Ma)

Stratigraphic Name: Manastash Formation; Naches Formation; Roslyn Formation; O'Brien Creek Formation

Description: Predominantly sandstone and shale. Includes some conglomerate in the Cle Elum area in Kittilas County. Contains extensive coal seams near Roslyn and carbonaceous shale and coal beds in White Pass area. Contains tuff beds in northwestern Ferry County.

Comments: Naches Formation is mostly basaltic and rhyolitic volcanic rock with minor andesitic rock and interbedded sedimentary rock (feldspathic sandstone) (Tabor and others, 1993, Stout, 1964). The thickness of the Naches Formation is 8000-10000+ feet thick (Stout, 1964).

Lithology: Major:{arkose}, Minor:{siltstone,basalt,rhyolite}, Incidental:{shale, conglomerate, bituminous, andesite, argillite, volcanic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page 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.
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