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<br /> DESCRIPTION OF MAP UNITS
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<br /> qs Sand dunes(Holocene) Windblown sand and dune sand
<br /> oFlood-basin deposits (Holocene) Clay, sift, and some sand:near Stockton •F 0,,,� h Lake
<br /> consist of muck,peat,and other organic soils. in places may include part C:✓.,•,rl„
<br /> of the Modesto Formation(Pleistocene)
<br /> - River deposits (Holocene) Gravel, sand, silt, and minor amounts of clay; PTs 51P'��j
<br /> deposited along channels,flood plains,and natural levees of main streams. S.
<br /> In places may include part of Modesto Formation(Pleistocene) •7
<br /> t3TI Lacustrine and marsh deposits (Pliocene to Holocene) Clay,silt,and some
<br /> sand; in subsurface Include three widespread clays:A clay (Pleistocene
<br /> and Holocene?);C clay(Pleistocene):and modified E clay(Pleistocene),
<br /> includes Corcoran Clay Member of Tulare and Turlock Lake Formations Geologic Map from R.W.Page,1966,U5G5 Profecerional Paper 1401-C.
<br /> QT. Continental rocks and deposits(Miocene to Holocene) Heterogeneous mix of
<br /> generally poorly sorted clay,silt,sand,and gravel;some beds of claystone,
<br /> sil , sandstone, and conglomerate. Include some informal units: A GELOGIC MAP OF THE
<br /> youngerungeralluvium(Holocene),older alluvium(Pleistocene and Holocene?
<br /> and continental deposits (Pliocene and Pleistocene);three formations oI
<br /> Pleistocene age: Modesto,Riverbank,and Turlock Lake;Tulare Forma-
<br /> tioSAN JOAQUI N VALLEY
<br /> Forma-
<br /> tion (Pliocene and Pleistocene) on western side of valley, Laguna For-
<br /> mation(Pliocene)on eastern side,and Kern River Formation(Miocene to
<br /> Pleistocene?)on southeastern part
<br /> 7vtl 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 /> rcvm Continental rocks and deposits(Miocene and Pliocene) Gravel,sand,silt,clay,
<br /> conglomerate, sandstone, siltstone,and claystone, contain andesitic
<br /> material. Principally Mehrlen 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 /> Tcmd 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 /> 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 fanglomerates(Miocene)
<br /> and Bona Gravel(Miocene)in the southern part
<br /> iS,wvlt(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 /> Bealviile Fanglomerate (Oligocene and Miocene) and the Walker For-
<br /> mation(Eocene to Miocene)
<br /> TRP;.., 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 E RSO
<br /> oTs Marine rocks (Pro-Tertiary) Sandstone,shale,sillslone,and some limestone, r .(,
<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 /> Panoche Formation(Cretaceous) GEOTECHNICAL SERVICES-ENGINEERING LABORATCMES Z W
<br /> 22 Houston Ln Lod,CA 95M O �
<br /> ®Granitic rocks(Pre-Tertiary) Chiefly granitic rocks on eastern side of valley,in (200)307-3701 7 \r
<br /> places consists of mafic intrusive rocks S S O L
<br /> o'hfr- Metamorphic rocks (Pre-Tertiary) Metasedimentary, metavolcanic and other Plate 6
<br /> metamorphic rocks on eastern side of vallev
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