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<br /> DESCRIPTION OF MAP UNITS e, r'� Qf :✓
<br /> a3 Sand dunes(Holocene) Windblown sand and dune sand "
<br /> i O. Etr:at Lake
<br /> -qo• Flood-basin deposits (Holocene) Clay, silt, and some sand;near Stockton I '
<br /> consist of muck,peat,and other organic soils. In places may include part -C YVr;'C
<br /> of the Modesto Formation(Pleistocene) _
<br /> „Qr River deposits (Holocene) Gravel, sand, silt, and minor amounts of clay; PTS '.SP
<br /> deposited along channels,flood plains,and natural levees of main streams.
<br /> In places may include part of Modesto Formation(Pleistocene) (�
<br /> qTk Lacustrine and marsh deposits (Pliocene to Holocene) Clay,slit,and some (
<br /> sand: in subsurface include three widespread clays: A clay (Pleistocene
<br /> and Holocene?);C clay(Pleistocene):and modified E clay(Pleistocene). Geologic Ma from R.W.Pa e,1986,U5G5 ona
<br /> Prafeoeil Paper 1401-C.
<br /> includes Corcoran Clay Member of Tulare and Turlock Lake Formations o9 P 9 p
<br /> -Tc Continental rocks and deposits(Miocene to Holocene) Heterogeneous mix of
<br /> generally poorly sorted clay,silt,sand,and?ravel:some beds of claystone,
<br /> siltstone, sandstone, and conglomerate. nfude some informal units A GELOGIC MAP OF THE
<br /> younger alluvium(Holocene).older alluvium Pleistocene and Holocene?
<br /> and continental deposits(P iocene and Pleistocene);three formations o
<br /> Pleistocene age: Modesto,Riverbank,and Turlock Lake;Tulare Forma-
<br /> tion (Pliocene and Pleistocene) on western side of valley,Laguna For- SAN JOAQUIN VALLEY
<br /> mation(Pliocene)on eastern side,and Kern River Formation(Miocene to
<br /> Pleistocene?)on southeastern part
<br /> Volcanic rocks and deposits (Miocene and Pliocene) Massive tuff with large
<br /> fragments of vesicular basalt northwest of Tracy; tuff, and volcanic
<br /> breccia at south end of valley
<br /> fT;;pWj Continental rocks and deposits(Miocene and Pliocene) Gravel,sand,silt,clay,
<br /> conglomerate, sandstone, siltstone,and claystone, contain andesitic
<br /> material. Principally Mehrten Formation (Miocene and Pliocene) on
<br /> eastern side of valley include continental equivalents of Etcheg'oin For-
<br /> mation (Miocene and Pliocene) on western side of valley,and Chanac
<br /> Formation(Miocene)on southern part
<br /> No Continental and marine rocks and deposits (Miocene and Pliocene) Gravel,
<br /> sand, sill, clay,silty sandstone, and siltstone. Include continental and Scale:1:500,00
<br /> marine equivalents of San Joaquin Formation (Pliocene) and Etchegoin
<br /> Formation(Miocene and Pliocene) 1 in=8 mi
<br /> Marine rocks and deposits(Eocene,Oligocene,Miocene,and Pliocene) Sand,
<br /> clay.silt,sandstone,shale, mudstone,and siltstone. On western side of
<br /> valley include the San Joaquin and Etchegoin Formations, Temblor
<br /> Formation (Oligocene and Miocene) and Kreyenhagen Formation
<br /> (Eocene). On southeastern side include the Santa Margarita Formation of
<br /> various authors,the Round Mountain Silt,the Olcese Sand,the Freeman
<br /> Silt,and the Jewett Sand(including the Pyramid Hill Sand Member)(all
<br /> Miocene).and the Vedder Sand(Oligocene)
<br /> Tcmo Continental rocks and deposits(Oligocene and Miocene) Gravel,conglomerate,
<br /> sand,tuffaceous sand,clay,and sandy clay;contain rhyolitic material on
<br /> eastern side of valley. Principally Valley Springs Formation(Oligocene
<br /> and Miocene)on eastern side of valley;unnamed fanglornerates(Miocene)
<br /> and Bona Gravel(Miocene)in the southern part
<br /> Continental rocks and deposits(Eocene to Miocene) Conglomerate,sandstone,
<br /> consolidated fanglomerate,claystone.tuff and tuff breccia;near Fresno
<br /> consist of tuffaceous sand and gravel. Near Bakersfield include the
<br /> Bealville Fanglomerate (Oligocene and Miocene) and the Walker For-
<br /> mation(Eocene to Miocene)
<br /> rca Continental rocks and deposits(Eocene) Conglomerate and sandstone;along
<br /> eastern side of valley contain anauxite. Principally Ione Formation
<br /> (Eocene)on eastern side of valley
<br /> Unconformity 'P E R S 0
<br /> pre Marine rocks (Pre-Tertiary) Sandstone,shale,siltstone,and some limestone, .
<br /> chiefly on western side of valley;in places contain abundant secondary NEIL O.ANDERSON&ASSOC.,INC.
<br /> gypsum. oIm
<br /> Include Moreno Formation (Cretaceous and Paleocene) and "'
<br /> Panoche Formation(Cretaceous) cEOTECMCALSECES-ENGINNEERING BORAAT�I C �
<br /> pS1`if_ Granitic rocks(Pre-Tertiary) Chiefly granitic rocks on eastern side of valley,in (mo)7a7aTot 7 S S O CSP
<br /> places consists of mafic intrusive rocks
<br /> PT_ Metamorphic rocks(Pre-Tertiary) Metasedimentary,metavolcanic and other late 6
<br /> _
<br /> metamorphic rocks on eastern side of valley
<br />
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