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<br /> CESCRIPTION OF NIAP UNITS \ 111 �•.,.'
<br /> Sand dunes(Holocene) Windblown sand and dune sand
<br /> y
<br /> s rood-bun deposits (Holocene) ClAy,silt. an" sarne sand,near StOcktOn
<br /> ca 'st of muck,Deal,and other organic u:ds In places may include part
<br /> of tl:e N'ocesto Formation tPlestace-r e - - ;
<br /> River deposits (Holocene) Gravel, sand c't and minor amounts of day:
<br /> -- dVus;tod along arnels.flood plains and natural levees of main st•ear,S. F>T s $�
<br /> In places may include oat of Modesto Formation(Pleistocene) ¢
<br /> t2T; Lacustrne and marsh deposits (Pliocene to Holocene) Cizy,sat,and rine
<br /> Sand; in subsurface irx;'Ae three widespread clays:A clay(Pleistexer,a
<br /> and Ho:ocer>e?);C clay(Plaistoceoe):and modified E C`ay(Pieisto,.er:e). Geologic Ma from R.W. Page, 1986, USGS Professional Paper 1401-C.
<br /> es includes Corcoran Clay htem^„er of?-ufareandTuriock Lake formations 9 P 9 P
<br /> } QTc.)Continental rocks and deposits(Miocene to Holocene) Heterogeneous mis or
<br /> ---- ge+,eraliy pi ooy sorted clay,silt,send,and gravel;some beds of claystone,
<br /> siitstona. sAndstona, and conglomerate. Include some informal units: A GELOGIC MAP OF THE
<br /> younger'alluvium(HoiC-6enld
<br /> e).older aliyvwm(Pleistocene and Ho :ere?'
<br /> ar:d continental.depopts(Pliocene and Pleisto:;ene);three formations Of
<br /> Plentoca,e age, Modesto.Riverbank,and Turlock Lake:Tulare Forma- SAN J OAO U I N VALLEY
<br /> ?ioa (P:focene an: Pleistocene) on western side of valley, L.,'.�guna For-
<br /> mat'nn(N otxre)on eastern side,and Kerr.River Forn+a tion(tl oceno to
<br /> Plei ta<e:aa?)un ioutheaste+n part
<br /> fotcanic rocks and deposits (Miocene and Pliocene) Massive tuft with large
<br /> f ragmens of vesicula: basalt ncrthv:est of Tracy; tuff. and voicani<
<br /> b.ecx.id at youth end of Walley
<br /> T Continental rocks and deposits(Miocene and Pliocene) Gravel,sand,silt,clay.
<br /> langlomerate, sandstone, siitstane,and claystone, contain andesitic
<br /> material. Principally Mehrten Formation (Miucene and Pliocene) ,
<br /> eastern side of valiey;include continental equ,va;eots of Etct:s_�5�m For
<br /> rr:at;on (Miocene and Pliocene) on western side of valley,and Chanac
<br /> F0,iti—tion(` Scene)on southern:part
<br /> r
<br /> Continental and marine rocks and deposits(Miocene and Pliocene) Gravel.
<br /> sa_,, sill. clay,siay saoCstone,and srtstone include continental and Scale: 1:500,00
<br /> marine equivalents of.tan JraggJr. Formation {Pllucere} and Etchegoir.
<br /> Formation(Miocene and Pliocene) 1 in =8 mi
<br /> ,i Y,Xgtt Marine rocks and deposits(Eocene,Oligocene,Miocene.and Pliocene) Sand,
<br /> clav,Of,sands-tone,shale, muds;--,ne,and siCstone. On western side of
<br /> vaifey, include the San Joaquin•, and Etchego*n 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 Si:t,the Olcese Sand,the Freaman
<br /> silt,and the Jeveett Sand(including the Pyramid Hill Sand tvtember)(all
<br /> iliocene),and the Vedde,Sanct(Oligocene)
<br /> arra _
<br /> Continental rocks and deposits(Oligocene and Miocene) Gravid,conglonmete,
<br /> sand,tuffaceous sand,clay,and sand c:ay:contain rhycilitic material on
<br /> eastern j.de of: valley. Prin:.lpa ly l alley Springs Formation(Oligocene
<br /> are =ioxre)on eastern side of valiey;unrarned fanglomerates(Mioctne)
<br /> as Sena Grave:;Miocene)in the southern part
<br /> ti Continental rocks and deposits(Eocene to Miocene) Corgirrnarate,sandstone,
<br /> cor:V)hdattvt faog;omerate,claystone,tuft and tuff brcx:cia;near Fresno
<br /> consist of t::ffar-eous sand and gravel. Near Bakersfield include the
<br /> BwWAie FanglOmerate (Oligocene and Miocene) and the Vjaiker Frr-
<br /> r:,a inn(Eocer a-o Miocene)
<br /> 1 Continental rocks and deposits(Eocene) Conglomerate and sandstone:along
<br /> aaT esaerr, side of valley contain anau,cr:e. Principally tone Formation
<br /> (Eocene)on eastern side of valley
<br /> Unconformity V p E R S0�
<br /> } Marine rocks(Pre-Tertiary) Sandstone,shale.siltstone-and some limesto:r..
<br /> chiefly on western side of valley:in paces contain abundant secondary NEIL O.ANDERSON&ASSOC., INC>
<br /> s gypsum. Include Moreno Fortration (Cretaceous and Palerxenel) and '"
<br /> Panache Formation(C.relaLOnU6) GEOTECHNICAL SERVICES-ENGINEERING LABORATORIES Z
<br /> 22 HousWn Ln.Lodi,CA 96240 O
<br /> Granitic rocks(Pre-Tertiary) Chiefly granitic rocks on eastern side of valley,in (209)367-3701 qS S O c
<br /> places consists of trafic intrusive rocks
<br /> `.0�Metamorphic rocks (Pre-Tertiary) Metasedirnentary, metavalcanrc And other Plate 6
<br /> r..
<br /> ----- metamorphic rocks on,as;arr.side of valley
<br />
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