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<br /> DESCRIPTION OF MAP UNITS 25Hn 1 G
<br /> 22
<br /> Sand duns
<br /> e (Holocene) Windblown sand and dune sand QTDC !'W -O ~
<br /> CaJbona
<br /> .-
<br /> Floodconsist deposits (Holocene) Clay, sill. and some places
<br /> near Stockton
<br /> t I p
<br /> .other of muck,pooh and other organic soils. In places may include part O -
<br /> ol the Modesto Formation(Pleistocene)
<br /> River deposits (Holocene) Gravel, sand, silt, and minor amounts of clay;
<br /> deposited along channels,flood plains,and natural levees of main streams. ,airs
<br /> In _ !l rrQ-
<br /> places may include part of Modesto formation(Pleistocene) rte-. - -- _ - - _ —
<br /> Lacuslrine and marsh deposits (Pliocene to Holocene) Clay, silt, and someL_ �� _-
<br /> -- sand: in subsurface include three widespread clays: A clay (Pleistocene Qr
<br /> and Holocene?):C clay(Pleistocene):and modified E clay(Pleistocene). v 20oj 1 l
<br /> Includes Corcoran Clay Member of Tulare and Turlock Lake Formations
<br /> - Continental rocks and deposits (Miocene to Holocene) Heterogeneous mix of 1 O: Brush Lake
<br /> generally poorly sorted clay.sill,And.and gravel;some beds of claystone, I O Wcstle
<br /> Otstone. sandstone, and conglomerate. Include some informal units: y
<br /> younger alluvium(HoloceIF
<br /> ).older alluvium(Pleistocene and Holocene?1 �f G(
<br /> and continental deeppoohts Pliocene and Pleistocene:three formations of DTs - SP
<br /> Pleistocene age: Me lento,Riverbank.and Turlock Lake:Tulare Forma. 1 y
<br /> lion ocencene and Pleistern aj on western side e) valley, anal For. I 7
<br /> matron (Pliocene)on eastern side.and Kern River FormaLon(Miocene to x..
<br /> Pleistocene')on southeastern part
<br /> Tied]Volcanic rocks and deposits pasaftena and Miaaen.l Massive tun with large Map Base:Page, R.W, 1986, Geology of the Fresh Ground-Water
<br /> fragments of vesicular basalt northwest ce racy; tuff, and volcanic
<br /> breccia at south end of valley Basin of the Central Valley, California, with Texture Maps and
<br /> Continental rocks and deposits(Miocene and Pliocene) Gravel.sand.silt,clay. Sections:USGS Professional Paper 1401-t..
<br /> 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 Charon:
<br /> Formation(Miocene)on southern part
<br /> '�Continental end marine rocks and deposits (Miocene and Pliocene) Gravel,
<br /> sand. silt, clay.silty sandstone, and siltstone. Include continental and
<br /> marine equivalents of San Joaquin Formation (Pliocene) and Etchegoin
<br /> Formation(Miocene and Pliocene)
<br /> Marine rocks and deposits(Eocene.Oligocene,Miocene,and Pliocene) Sand.
<br /> clGEOLOGIC MAP
<br /> ay. silt.sandstone,shale, mudstone,and siltstone. On western side of
<br /> valley include the San Joaquin aril Etchegoin Formations, Temblor
<br /> Formation (Oligocene and Miocene) and Kreyenhagen Formation LINDEN 333 S. HEW/TT ROAD , CA
<br /> (Eocene). On southeastern side include the Santa Margarita Formation of r
<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 PA-0500050
<br /> Miocene),and the Vedder eared(Oligocene)
<br /> 7 Continental rocks and deposits(Oligocene and Miocene) Gravel,conglomerate,
<br /> sand,wnaceouf 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 fanglometales(Miocene)
<br /> and Bene Gravel(Miocene)in the southern part
<br /> "A Condiefntal rocks and deposits(Eocene to Miocene) Conglomerate,sandstone,
<br /> consolidated fa glomerate.claystone, tuff and tuff breccia;near Fresrm
<br /> consist of tuffaceous sand and gravel. Near Bakersfield include the
<br /> Bceiville Fanglomeole (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 Ione Formation
<br /> (Eocene)on eastern side of valley
<br /> Unconfprmity Scale. 7:500,000
<br /> pn ' Marine rocks (Poi-Tertiary) Sandstone, shale,siltstone, and some limestone, 1 in = 8 rnl
<br /> chiefly on western side of valley: in pieces contain abundant secondary
<br /> gypsum. Include Moreno Formation (Cretaceous and Paleocene) and
<br /> Penoche Formation(Cretaceous)
<br /> 0*9]Granitic rocks(Pro,Todiary) Chiefly granitic rocks on eastern side of valley,in NEIL O. ANDERSON
<br /> places consists of final c intrusive rocks A N D A S 5 0 C I A T E S
<br /> . .71 Metamorphic rocks (lan,Tertlary) Malasedrmentary, metavolcanic and other Plate 7
<br /> morphic rocks on gastarn side of valley
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