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Washington Department of Natural Resources Division of Geology and EOrth Resource~
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Bose f rom U.S. Topographic 1 :ZS0,000 series
Pu l lman Quad, 1955
45'
Edited, reYiewed, and adjusled to 1:250,000 scale toppg rophic
base mop by Kurt L Olhberg , Allen J. Fiksdo l, Jomes G. Rigby,
and Glenndo Mc l ucas
:!iT JOI-I"' ,o 1-11
30
Open File Report OF 79-9
Th is report is prel iminary and has not been formally edited or reviewed.
5/"0l(,ON£ !2 Ml o ... ,sO,UL 12 Ml TE:1<,SE'D I.'!" M l £MIDA n M l
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117'00 ' ' 45
SURFICIAL GEOLOGIC MAP OF THE PULLMAN QUAD, WASHINGTON
by
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Gary D. Webster
1979
5
SCAL E 5
10
Contour I nterval 200 Feet
10 Miles
15 Ki lometers
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I~ :n,61-',
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Produced in cooperation with Rockwell Hanford Op erations
and the U.S. Department of Energy
CLAR~IA I 1-1•
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Geo logy mopped in 1978-1979
Qd
Qa
Qaf
Correlation of Mop Units
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[~,la:~ Qc ?
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.. C: .. u 0 0 I ..
-
Qd ~ ? -
QI Qls ?
[§!] Oaf is u !?. ., ·.;;
Qgd Qfs Qfg Qgl Qtb
? ? ? rE Tc
Te ? ?
a: .. C: .. u .2 o._
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? ! Ty ..
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B ..
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~ u Q. .2
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DESCRIPTION OF UNITS
DUNE SAND Active and stabilized dunes of predimonately fine-to medium sand; mostly
quartz and basalt grains reworked from older sedimentary deposits.
ALLUVIUM - Primarily stream deposits of silt, sand, and gravel i n floOOplain·s, terraces,
and valley bottoms. Includes local lacustrine, paludal, and eolian deposits in
depressions.
ALLUVIAL FAN [)[POSITS - Primarily unconsolidated sand and gravel. Surface is relatively
undissected and exhibits little or no petrocalcic soil development (ca l iche ) .
0c COLLUVILJM- Primarily angular to subangular basaltic debr is accumul ated at the base of
steep slopes and cliffs. Includes talus and talus cones formed by active and inactive
rockfall .
Qls LANDSLID£ D£P05I TS - Unst r atified and poorly-sorted c lay, silt, sand and gravel deposited
by rotational and translational slides and flows.
Ql LOESS - Loess deposits consisting of eolian sil t and fine sand up to 75 meters in thickness.
Generally not mapped ~here less than approximately 2 meters thick . locally conta ins
multiple petrcx:alcic horizons and tephra beds.
Qafo OLDER ALLUVIAL FAN DEPOSITS - Primarily semi-consolidated gravel or fanglomerate. Surface
of fans are dissected and capped by well-developed petrocalcic soils (caliche ) .
Qfs CATASTROPHIC FLOOD SLACK-WAT ER SEDIMENTS - Rhythmically bedded and graded s ilt, sand , and
gravei deposited by lower-energy slack waters of catastrophic floods and (or ) surges of
catastrophic floods. Includes the Touchet beds.
Qfg CATASTROPHIC FLOOD GRAVELS - Predominantly coarse gravel and sand deposited by higher-energy
Qtb
llgl
llgd
Qt
(Hgt
Tt
fr
Tc
Te
Ty
pm
waters of catastrophic floods.
TERRACE ANO BAR DEPOSITS, UNDIFFERENTIATED - Claciofluvial, fluvial, and ice-contact strat
ified silt, sand, and gravel depos its of various litho logies in terraces and bars in
the valleys of the Columbia, Okanogan , and Spokane Rivers and tributar ies. Includes
deposits of the Great Terrace.
GLACIOLACUSTRINE TERRACE DEPOSITS - Silt, sand, and gravel deposited in glacial lakes that
formed along the Columbia, Okanogan, and Spokane Rivers and their tributaries . In
cludes deposits of the Nespelem Terrace . Surface of the terraces may exhibit local
modification by fluvial and catastrophic floOOwaters.
GLACIAL DEPOS ITS - Till, out~ash, and ice-contact stratified deposits in moraines, till
plains, and melt-water channels and terraces.
TIETON ANOESITE - Andesitic flow of the lowe r Naches River drainage.
GRAVEL OF TERRACE REl'f'lANTS - Gravel and coarse sand in remnants of high fluvial terraces
and alluvial fans with1n the Yakima River drainage basin. Includes the Cowiche gravel .
Age uncertain, but may be in par t correlative with Thorp Gravel, Ellensburg Formation,
Ringold formation ·, and gravels of ancestral Columbia River { Tc).
THORP GRAVEL - Fluvial {?) gravel in dissected high terraces and alluvial fans in the
Ki tt itas Va l ley . Probably correlative with the upper Ringold Formation .
RINGOLD FORMATION - Fluvial and lacustrine c ~ay, silt, sand, conglomerate and fang lomerate
of diverse composition. Includes a cap of thick, well-developed petrocalcic soil
(caliche ) . May be correlative with the uppermost El lensburg Formation.
GRAVEL OF ANCESTRAL COLU~IA RIVER Predominantly we l l-rounded pebble grave l . Columbia
Rive r provenance indicated by a dominance of quartzite pebbles .
ELLENSBURG FORMATION - Primarily weak ly lithified fl uvia l and laharic deposits. Base un
de f ined . Mapped only II/here they over l ie the Yakima Basal t SubGroup. Dominated by
dacitic , andesitic, and pumiceous clasts.
YAKIMA BASALT SUBGROUP - Lava flows of t he Saddle Mountains, Wanapum, and Grande Ronde
Basalt Formations. Includes sedimentary interbeds of the Ellensburg and Latah
Format ions, local colluvium , caliche, and widespread thin loess.
PRE-MIOCENE ROCK S, UNDIFFERENTIATED - Prima r ily Precambrian through Mesozoic metamorphic
and plutonic rocks, and early Tertiary sedimentary and vo lcanic rocks .
Contact
Map unit sym bols, cor relat ions , and descriptions compi led by Kurt L. Ot hberg1
Jo mes G. Rigby, and Glenndo Mclucas
Geo l ogic Mapping of Late Cenoz oic Sediments, Co lumbia Basin, Washington
1Z0° 111° ~--+------t-----+--~- 49"
G .. olc,gic "'"l'Pil"I\J, 1976- 79, by N.P. Ca""°"ll ( area ! ) ; L. G. f>ar,, .. ,n
( 3rea 2): L P. Kiver, D. f . Stndling, an<l J.G. fligby (eree J ) ; G.
D. WebetH ( lire& 4 ) ; and J .T. Li llie (area'; ) , The g,,ology of
Uv: nortr. centnl 1olalla Wa lh Quedrangle, QW the :,ouU, central
Ritzville Quadrang le was field checked, s;mplif ied , "'Kl gerieral
i zed frnrn Gro lier Bnd Bingrn>OI (1971). The IJ"Dlogy of the ~auth
eastern portioo of t~ Wenatcr.ee l),a<:1r&r19l<' wH field check<'d ,
:,i111Plified, a nd gef"Jl! ralized fr oo, lat>or and otr-.era (1977) .
Gr ol ie r , M. J.; Bingha .. , J. W., 1971, Geol ogic ""'P and sections of
p~rls of Crant, Adams and frrilin Counties, Washington, U.S.
Geological Survey Miscell-o..,a Geolc,gic !n•estigetions Mop 1-589 ,
6 shee t s , scale . l:62, ';00.
T.tbor. R. ~. : and others, 1977, Prell,.,ns,r y ,ieol oglc map of the
Wer>a tchoee l:JD0,00 l)Jadr ang l e, ~ashiro9to.i: U.S. Geolugica l
Survey ~n-file Report 77- 5)1, 2~ p.
.
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