• 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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WASHINGTON
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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0uer!urned
Geochemical sample locality
