• WASHINGTON STATE DEPAIHMENTOF

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Base map prepared from U.S . Geological Survey 7.5-minute Pomona (1974), Selah Sprmgs (1953), Yakima East (1974), and Elephant Mtn. (1953) quadrangles; 1927 North American datum

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OUAORANGLE LOCATION

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Prepared in cooperation with the U.S. Department of Energy under contract number DE-AC06-81RL10297

Washington Division of Geology and Earth Resources Open File Report 93-3

Sheet I -Ya kima East 15-mlnute quadrangle

GEOLOGIC MAPS OF PART OF

THE YAKIMA FOLD BELT,

NORTHEASTERN YAKIMA COUNTY,

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by Robert D. Bentley, Newell P. Campbell,

and John E. Powell

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1993

GEOLOGIC UNITS

Surficlal deposits

Alluvium, mainstream fades

Alluvium, sidestream fades

Terrace deposits, mainstream alluvial deposits

Lower terrace deposits

Middle terrace deposits

Alluvial fa n deposi ts

Landslide deposits

Eolian deposits

Catastrophic flood slackwater sediments

Older a lluvial fan deposits

Older gravel deposi ts

Thorp Gravel

Mainstream lacies

Sidestream facies

Elle nsburg Formatio n

Upper Ellensburg Formation, undivided

Rattlesnake Ridge Member

Selah Member

Mabton Member

Squaw Creek Member

Vantage Member

Columbia River Basa lt Group

S addle Mountains Basalt

Elephant Mou ntain Member

Intracanyon flows

Pomona Member

Esquatzel Member

Umatilla Member

Wanapum Basalt

Priest Rapids Member

Roza Member

Frenchman Springs Member

Sentinal Gap flows

Kelley Hollow flow

Sand Hollow flow

Ginkgo flows

Gra nde Ronde Basa lt

Upper basalt flows of normal magnetic polarity

High -magnesium chemical type

Low-magnesium chem ical type

Upper basalt flows of reversed magnetic polarity

EXPLANATION

Contact

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Fault- Dashed where approximately located; dotted where concealed; queried where uncertain; ba r and ball

on downthrown side

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" Thrust fault, showing dip- Dashed where approximately located;

dotted where concealed; queried where uncertai n; sawteeth on upper plate

Fault- Showing relative horizontal movement

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Lineament from aerial photographs, showing dip

~--+----+--Anticline- Showing d irection of plunge;

dotted where concealed

Syncline- Dotted where concealed

Monocline- Dotted where concealed; arrows on side with greater Incli natio n

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Vertical

Strike and dip of beds

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Geochemical sample locality