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Prepared in cooperation with the U.S. Department of Energy under contract number DE-~C06-81RL10297

Walhlnlton Dlvlalon of GeolOlftl and Earth Reaourceo Open FUe Report 93-3

Sheet 3-Toppenish 15-mlnute quadran1le

GEOLOGIC MAPS OF PART OF

THE YAKIMA FOLD BELT,

NORTHEASTERN YAKIMA COUNTY,

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WASHINGTON

by Robert D. Bentley, Newell P. Campbell,

and John E. Powell

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1993

GEOLOGIC UNITS

Surflclal depoolts

Alluvium, mainstream facies

Alluvium, sidestream facies

Terr ace deposits, mainstream alluvial depo:s.its

Lower terrace deposits

Middle terrace deposits

Alluvial fan deposits

Landslide deposits

Eolian deposits

Catastrophic Hood :s.lackwater sediments

Older alluvial fan deposits

Ellen1bur9 Formation

Upper Ellensburg Formation, undivided

Conglomerate of Snipes Mountain

Rattlesnake Ridge Member

Selah Member

Columbia River Basalt Group

Saddle Mountains Ba-It

Elephant Mountain Member

Pomona Member

Umatilla Member

Wanapum &.Nit

Priest Rapids Member

Roza Member

Frenchman Springs Member

Sentinel Gap flows

Kelley Hollow flow

EXPLANATION

Contact-dashed where approximately located

Fauh- Dashed where approximately located; dotted where concealed; bar and ball on downthrown side

Fauh-Dashed where approximately located; dotted where concealed; bar and ball on downthrown side; (solid

where Quaternary units are a/fut)

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Thrust fauh-Doued where concealed; queried where uncertain; sawteeth on upper plate

Lineament from aerial photographs

--+-·---·

Anticline-Showing direction of plunge; dashed where approximately located; dotted where concealed

Syncline- Dashed where approximately located; dotted where concealed

Monocline-Arrows on side with greater Inclination

' / Strike and dip of inclined beds

... Geochemical sample locality