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<br /> DESCRIPTION OF MAP UNITS s o
<br /> `I Da
<br /> J Send dunes(Ilolocene) Windblown sand aM dwla sand \
<br /> Flood hard demons (Holocene) Clay. sill, and some sand,neer Stockton 1 Brush Lake
<br /> nsrst of muck,peat,and other organic soils. In places may include part 0W... Hii
<br /> pf the Modesto Formation(Pleislocme)
<br /> tit' n 5P
<br /> River deposits lens,(Holocene) Gravel, sand, silt, add minor amounts of clay;
<br /> Inp laces along ludo part of Mlood Plains,and natural leveesce main streams. C'
<br /> In places may mdutle part of Modesto Formation(Pleistocene)
<br /> U<ustrina and manh deposits (Pliocene to Holocene) Clay, silt, and some
<br /> ,and; in subsurface include three widespread clays: A day (Pleistocene
<br /> and Holocene);C clay(Pleistocene).and modified E clay(Pleistocene), (jam is Ma frau R.W.Pa e,1986,U5G5 ProfeePiorsal Pa er 1401-L.
<br /> includes Corcoran Clay Member or Tulare and Turlock Lake ormatlens G9 P B P
<br /> Continental rocks and daposlta(Mi«ma to Holocene) Helerogmmas mix of
<br /> _ generally Poorly sorted clay,silt,pri and gravel;same beds of claystone.
<br /> younfim. sandstone, and conglomerate..aide, Include soma informal ..?) A GELOGIC MAP OF THE
<br /> younger alluvium Holocene).cener alluvium Plene);one and Hot«ern?
<br /> and continental repos (Pliocene acid Pleistocene);three formations of
<br /> tioPleistocene age: Modesto.Riverbank,antl Turlock Lake;Tulare Forma
<br /> bann(Ph ce and easteraM, on western ride of valley. (21"A Far. SAN JOAQUIN VALLEY
<br /> motion(ne?)on son eastern title.and Kern River Formation( Deane to
<br /> Pleistocene?)on southeastern part
<br /> L� Volcanic decks and deposits (Miocene and Placers e) Massive tuff with large
<br /> fragments of v cular Wzalt northwest of Tracy; tuff, and volcanic
<br /> breccia at south end of valley
<br /> L Cidetbr l.6 and deports;(Miocene and Pli«ens) Gavel sand,silt,clay.
<br /> il
<br /> coglomeale, sandstone. sillalome.and claystone, contain adi esitsc
<br /> material, Principally Mohnen Formation (Miocene and Pliocene) an
<br /> eastern side of valley: " nude continental equivalents of Etchegb .,
<br /> atmn (Miocene and Pliocene) on western side of valley,add Charac
<br /> Formal(Miocene)on southern part
<br /> 1 ®Continental and marine rocks and deposits (Miocene and Pbaci ) Gravel.
<br /> 1` sena, sin, clay.silly sandstone.and sulstone. Include continental and Scale: 1:500,00
<br /> Forine equivalants of San Joaquin Formation (Pliocene) and Etchegoin
<br /> rmation(Mrocedeand Pliocene) 1 in=8 mi
<br /> ®Marine rocks alld deposits(Eocene.Oligocene.Miocam.add Pliocene) Sand,
<br /> clsYy,sin, sandstone, hale, mudslone,and silotone. On western side of
<br /> relay include the San JoagWn and Etchegoin Formations, Temblor
<br /> Formation (Obgocene and Miocene) and Ki,genbagen Formation
<br /> (Eocene). On soulbeas,ern side include the Santa Maopuda Formation of
<br /> venous authors,the Round Mountain Silt.the Olcese Send.the Freeman
<br /> Sit,Add!the Jewett Sand(including the Pyramid Hill Sand Member) (all
<br /> I Miocene),and the Vedtlei Sand(01.91ITame Came...W rill and deposits(Oligaaene and Miocene) Gravel,conglomerate,
<br /> L sand,W Haceous sand.nay,and sandy clay;contain rhyolilic material on
<br /> eastern side of valley. Principally Valley Springs Formation(Oligocene
<br /> antl Miocene)on eastern side of valley;unnamed anglomerates(Miocene)
<br /> And Be..Gravel(Miomne)In the southern Part
<br /> L®Continental rocks and deposit,(Eocene to Miocene) Congiomerate.sandstone,
<br /> consdlida,ed bnglomerate, claystone, tuft and tuff breccia;near Fresno
<br /> oront of Wflacano; send andgravel. Near Bakersbeld include the
<br /> Bealvdme
<br /> le Fanglorat. (Oligocene and Miocene) and the Walker For
<br /> nation(Eocene to Miocene)
<br /> Continental rock and depal Eocm.) Conglo root.And sandstone;along
<br /> asllro side o1 valley contain an m xite. Principally toFormation
<br /> (E..md on eastern side of valley
<br /> Unconformity da E R SO
<br /> ®Marina rocks (Pot-Terlioy) Sandstone.shale, sil,Aone,and some limestone. ♦ 1
<br /> chiefly o western side of valley: in places contain abundant secondary Neil 0.Anderson&Assoc., IOC. '
<br /> L gypsom Include Moreno Formation (Cretaceous and Paleocene) and e W
<br /> Panache Formabon(Crelacaous) GEOTECONICALSERNCES-ENGINEEROOLABORATORIES 1
<br /> 22Hou#nn Lu Lodi,CA G3M O A
<br /> ®Granitic rocks(AeTertlary) Chiefly granitic rocks on eastern side of valley,in (20)3a2dTp, �S 5 O Cs,
<br /> places consists of mafic intrusive rocks
<br /> �MatamerpLic rocks (PdeTeHirtyl Metasedimentary, metavolonic and other Plate 6
<br /> Lmnlamnrnhir r La nn walern aiAn nl ralle�
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