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Upper Ritter Quarry, Ritter, Grant Co., Oregon, USA

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Basalt on John Day Formation ash beds

Upper Ritter Quarry, Ritter, Grant Co., Oregon, USA
Collecting in the Upper Ritter Quarry 1994

Upper Ritter Quarry, Ritter, Grant Co., Oregon, USA
Basalt on John Day Formation ash beds

Upper Ritter Quarry, Ritter, Grant Co., Oregon, USA
Collecting in the Upper Ritter Quarry 1994

Upper Ritter Quarry, Ritter, Grant Co., Oregon, USA
Latitude & Longitude (WGS84): 44° 52' 17'' North , 119° 4' 59'' West
Latitude & Longitude (decimal): 44.87139,-119.08333
GeoHash:G#: 9rgr60w4v
Locality type:Quarry
Köppen climate type:Csb : Warm-summer Mediterranean climate


The Upper Ritter Quarry is located 4.5 miles west of highway 395 on the road following the Middle Fork of the John Day River to Ritter. The quarry was opened in the 1980's and worked sporadicaly every few years to gravel the roads in the area. The rock consists of vesicular and dense zones of a single basalt flow that is the lowest flow of the Miocene Picture Gorge Basalt (16 m.y.o.) in the Columbia River Basalt Group that rests on the ash beds of the John Day Formation.

Rudy Tschernich


Mineral List


13 valid minerals.

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 Macrostrat.org

Neogene
2.588 - 23.03 Ma



ID: 3186305
Cenozoic volcanic rocks

Age: Neogene (2.588 - 23.03 Ma)

Stratigraphic Name: Columbia River Basalt

Comments: Columbia Plateau

Lithology: Flood basalt(s); mafic volcanic rocks; basalt

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Miocene
5.333 - 23.03 Ma



ID: 1560743
Columbia River Basalt Group; Picture Gorge Basalt

Age: Miocene (5.333 - 23.03 Ma)

Stratigraphic Name: Picture Gorge Basalt

Description: Columbia River basalt; 2000ft thick; intrusive/sedimentary/volcanic rocks; basalt; mixed lithologies

Lithology: Major:: {basalt flows, gray, brown, cast green, black; olivine plagioclase labradorite augite zeolites phenocrysts}; Major:: {gravel}; Major:: {sand}; Major:: {basalt dikes, cast green, gray, black}; Major:: {palagonite tuff, brownish yellow}

Reference: R.L. Smith, W.P. Roe (compilers). Oregon Geologic Data Compilation, release 6. State of Oregon Department of Geology and Mineral Industries. [20]

Middle Miocene - Early Miocene
11.62 - 23.03 Ma



ID: 2982078
Picture Gorge Basalt

Age: Miocene (11.62 - 23.03 Ma)

Stratigraphic Name: Picture Gorge Basalt

Description: Flows of aphyric and plagioclase porphyritic flood basalt. Potassium-argon ages mostly 15.0 to 16.4 Ma (Watkins and Baksi, 1974; Fiebelkorn and others, 1983)

Comments: In La Grande 30' x 60' quadrangle (OR291), unit includes Dayville Basalt, Monument Mountain Basalt, and Twickenham Basalt, all middle Miocene

Lithology: Major:{basalt}

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 Macrostrat.org, used under Creative Commons Attribution 4.0 License



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References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Tschernich, R.W. (1993) Minerals from Ritter, Grant County, Oregon. Micro Probe. V 7, No. 8, pp. 8-11.
Howard, D. and Tschernich, R.W. (1993) Zeolites from the Upper Ritter Quarry, Grant County, Oregon. Micro Probe. V 7, No. 8, pp. 12-17.
Howard, D. (1995) Update on the Ritter Quarry, Grant County, Oregon. Micro Probe. V 8, No. 1, pp. 20-21.

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