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<br /> DESCRIPTION OF MAP UNITS �' a'^ �. Qr I .77 1
<br /> 4s Sand dimes(Holocene) Windblown sand and dune said / v i
<br /> er II Qn 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 O YVe�.tic
<br /> of the Modesto Formation(Pleistocene) - _
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<br /> Ricer deposits (Holocene) Gravel, sand, silt, and minor amounts of clay. PTS \� r SP
<br /> deposited along channels,flood plains,and natural levees of main strums. Oso
<br /> er In places may include part of Modesto Formation(Pleistocene)
<br /> x171 Lacustrine and march de Posits (Pliocene to Holocene) Clay,silt,and some
<br /> sand; in subsurface nclude three widespread clays: A clay (Pleistocene
<br /> and Holocene?);C clay(Pleistocene):and modified E clay(Pleistocene). Gad is)v(a from R W.Pa e,1986,USGS Prafe�oriel Pa er 1401-C.
<br /> includes Corcoran Clay Member of Tulare and Turlock Lake Formations o9 p 9 p
<br /> t. Continental rocks and deposits(Miocene to Holocene) Heterogeneous mix of
<br /> e.r cagenerally poorly sorted clay,silt,sand,and gravel;some beds of claystone,
<br /> younger alluvium
<br /> (Holocene).
<br /> H and conglomerate. m(oda some informal units: A GELOGIG MAl' OF THE
<br /> younger alluvium Holocene).older alluvium Pleistocene and Holocene.
<br /> and continental deposits (Pliocene and Pleistocene):three formations of
<br /> Pleistocene age: Modesto,Riverbank,and T-unlock Lake;Tulare Forma-
<br /> tion (Pliocene and Pleistocene)on western side of valley, Laguna For.
<br /> malion(Pliocene)on eastern side.and Kern River Formation(Miocene to
<br /> NPleistocene?)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 /> brecc-a at south end of valley
<br /> Yetpre Continental rocks and deposits(Miocene and Pliocene) Gravel,sand,silt,clay,
<br /> Nee, 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 Etchegoin For.
<br /> mation (Miocene and Pliocene) on western side of valley,and Chanac
<br /> Formation(Miocene)on southern part
<br /> 'Rand Continental and marine rocks and deposits (Miocene and Pliocene) Gravel,
<br /> sand, silt, clay.silty sandstone,and siltstone. Include continental and Scale:1:500,00
<br /> inarvne equivalents of San Joaquin Formation (Pliocene) and Elchegnin
<br /> Formation(Miocene and Pliocene) 1 in =8 mi
<br /> ,Tai t 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 /> Tana Continental rocks and deposits(Oligocene and Miocene) Gravel,conglomerate,
<br /> nem sand,tuffaceous sand.clay,and sandy clay;contain rhyolitrc material on
<br /> eastern side of valley. Principally Valley Springs Formation(Oligocene
<br /> and Miocene)on eastern side of valley;unnarned fanglornerates(Miocene)
<br /> and Bona Grave;(Miocene)in the southern part
<br /> Continental rocks and deposits(Eocene to Mlocene) Conglomerate,sandstone,
<br /> consolidated tanglomerate,claystone,tuff and tuft 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 /> Tp 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
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<br /> Unconformity rp E R SO
<br /> pTq Marine rocks (Pre-Tertiary) Sandstone,shale.siltslone,and some Ilnsestone, r ti
<br /> chiefly on western side of valley; in places contain abundant secondary NEIL O.ANDERSON&ASSOC.,INC.
<br /> gypsum. Include Moreno Formation (Cretaceous and Paleocene) and > �^
<br /> Panache Formation(Cretaceous) GEOTECIIII SERVICES-ENGNEERNG LABORATORIES Z W
<br /> 22 Hwntan Ln t oil.CA 95240 O A,
<br /> Granitic rocks Pre-Tertian Chiefly granitic rocks on eastern side of valla
<br /> ( Y) Y g Y.in 12ro1 aeTaTot V S S O c�P
<br /> places consists of mafic intrusive rocks
<br /> F¢Pri Metamorphicrocks (Pre-Tertlary) Metasedimentary, metavolcanic and other Plate 6
<br /> metamorphic rocks on eastern side of vallev
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