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• WASfUNGTON STATE DEPARTMENT OF

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Waoh1n9ton Division of Geology and Earth Reoourcea Open FUe· Report 93-3

ShHt 2-Harrah IS-minute quadra119le

GEOLOGIC MAPS OF PART OF

THE YAKIMA FOLD BELT,

l NORTHEASTERN YAKIMA COUNTY, ,,

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

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WASHINGTON

by Robert D, Bentley, Newell P, Ca,mpbell,

and John E, Powell

Olm,

O!m2

1993

GEOLOGIC UNITS

Surflclal de-Its

Alluvium, sidestream facles

Terrace deposits, mainstream alluvial deposits

Lower terrace deposits

Middle terrace deposits

Alluvial fan deposits

Landslide deposits

Eolian deposits

Oe!o

Catastrophic flood sl.tickwater sediments

Older alluvial f.tin deposits

OTog Older gravel deposits

Tom

Tp

Tp;

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Tfsg

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Ellenai.u,,. Fomuitlon

Upper Ellensburg Formation, undivided

Rattlesnake Ridge Member

Vantage Member

Columbia River Baealt Group

Saddle MountalM a...lt

Elephant Mountain Member

Pomona Member

Umatilla Member

Wana~m .... It

Priest Rapids Member

Roza Member

Frenchman Springs Member

Sentinel Gap flows

Kelley Hollow flow

Ginkgo flows

Grande Ronde .._k

Upper basalt flows of normal magnetic polarity

High-magneSium chemical type

Low-magnesium chemical type

Upper basalt flows of reversed magnetic polarity

EXPLANATION

Contact-dashed where approximately located

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Fault-Dashed where approximately located; dotted where concealed; bar and baU on downthrown side; (solid

where Quaternary units are offset}

~-·······'1-··

Thrust fault-Dashed where approxlmately located; dotted where concealed; queried where uncertain; sawleeth on up~r plate

Lineament from aerial photographs

----+---+------Anticline-Dotted where concealed

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Syncline-dotted where concealed

----~----~-----------

Monocline- Dotted where concealed; arrows on sfde with greater lncllnatlon

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Horizon ta/ --+-

VerUca/

Strike and dip of beds

0 71

Geochemical sample locality