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<br /> DESCRIPTION OF MAP UNITS
<br /> Sand duras(Holocene) Windblown sand and dune sand
<br /> ®b Flood-basin deposits (Holocene) Clay, sill, and some sand:near Stockton ;, Brush Lake
<br /> consist of muck,peat,and other organic soils. In places may include part 10 wem in_v
<br /> of the Modesto Formation(Pleistocene)
<br /> 5(3 11 H
<br /> '? River deposits (Holocene) Gravel, sand, silt, and minor amounts of clay; PTs SP
<br /> deposited along channels,flood plains,and natural levee of main streams. i P�
<br /> In places may include part of Modesto Formation(Pleistocene) til -
<br /> GTI Lacustrine and marsh deposits (Pliocene to Holocene) Clay,sift,and some
<br /> sand; in subsurface include three widespread clays: A clay (Pleistocene
<br /> and Holocene?);C day(Pleistocene);and modified E clay(Pleistocene), Geolo is Ma from R.W.Pa e,1986,U5G5 Professional Pa er 1401-C.
<br /> includes Corcoran Clay Member of Tulara,and Turlock Lala Formations 9 P 9 p
<br /> Continental rocks and deposks(Miocene to Holocene) Heterogeneous mix of
<br /> generally poorly sorted clay,silt,sand,and gravel;some beds of claystone,
<br /> siltstone, sandstone, and conglomerate. Include some informal units:
<br /> younger alluvium(Holocs 1,older alluvium(Pleistocene and Holocene?) A G E L O G I C MAP OF THE
<br /> and continental deposits Pliocene and Pleistocene):three formations of
<br /> PleistoceneModesto,Riverbank,and Turlock Lake;Tulare Forma-
<br /> tion (Pliocene and Pleistocene) on western side of valley,Laguna For- S A N J OAQ U I N 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 Pllocene) Massive tuff with large
<br /> fragments of vesicular basalt northwest of Tracy; tuff, and volcanic
<br /> breccia at south and of valley
<br /> 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 Pliooyyene) on
<br /> eastern side of valley;include continental equivalents of Etch edoin For.
<br /> mation (Miocene and Pliocene) on western side of valley,andel Chanac
<br /> Formation(Miocene)on southern part
<br /> -Continental and marine rocks and deposits(Miocene and Pliocene) Gravel,
<br /> sand, silt, clay,silty sandstone,and siltstone. Include continental and OCAIC:1:500,00
<br /> marine equivalents of San Joaquin Formation (Pliocene)and Etch igoin
<br /> Formation(Miocene and Pliocene) 1 in=8 m i
<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 /> T___ 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 fanglomerates(Miocene)
<br /> and Bona Gravel(Miocene)in the southern part
<br /> -Continental rocks and deposits(Eocene to Miocene) Conglomerate,sandstone,
<br /> consolidated fangiomerate,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 /> ®Continental rocks and deposits(Eocene) Conglomerate and sandstone;along
<br /> eastern side of valley contain anauxite. Principally lone Formation
<br /> (Eocene)on eastern side of valley
<br /> Unconformity OERMarine rocks(Pw•Tertiary) Sandstone,shale,siltstone,and some limestone,chiefly on western side of valley;in places contain abundant secondary NEIL O.ANDERSON&ASSOC.,INCgypsum. Include Moreno Formation (Cretaceous and Paleocene) and PanocheFormation(Cretaceous) GEOTECHNIfALSERVICES-ENGINEERINGIABORATOWE3 22 Houston Ln.Lodi,CA 95219 Granitic rocks(Pre-Tertiary) Chiefly granitic rocks on eastern side of valley,in (209)387-3701
<br /> places consists of mafic intrusive rocks
<br /> ®Metamorphic rocks(Pre-Tertiary) Metasedimentary,metavolcanic and other late 6
<br /> metamorphic rocks on pastern side of valley
<br />
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