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Petaluma River Geologic

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Petaluma River Geologic STATE OF CALIFORNIA- GRAY DAVIS, GOVERNOR CALIFORNIA GEOLOGICAL SURVEY THE RESOURCES AGENCY- MARY NICHOLS, SECRETARY FOR RESOURCES JAMES F. DAVIS, STATE GEOLOGIST DEPARTMENT OF CONSERVATION- DARRYL YOUNG, DIRECTOR GEOLOGIC MAP OF THE Qha Tsvm Tsvr QTu Tpm Tpm Tsvr 60 Qha 25 Tvb Tsvm? PETALUMA RIVER 7.5' QUADRANGLE Qf 21 Tpm Tsvm Tsvm af Qhc Qhc Qha 25 Qhc 40 Tpm 30 Qha Tsvr Qhc Tsvm af MARIN AND SONOMA COUNTIES, CALIFORNIA: A DIGITAL DATABASE Qhc 40 35 Tsvr VERSION 1.0 Qha Qha Qhc By Qhf Tpm Qhc 1 1 1 2 1 70 David L. Wagner , Salem R. Rice , Stephen Bezore , Carolyn E. Randolph-Loar , James Allen , and Tvsm? 55 Robert C. Witter2 Tsvr Tsvm Tpm 30 Digital Database ac af 40 af Qha by 25 Unit Explanation Tvsm? 1 1 1 Qhbm Qhbm Tpm Jason D. Little , Victoria D. Walker , and Sarah E. Watkins Qhbm Qhf 30 Tsvm (See Knudsen and others, 2000, for more information on Tsvm 2002 afbm Quaternary units). afbm lt Tpu au 1. California Geological Survey, 801 K st. MS 12-31, Sacramento, CA 95814 o F afbm Qhc ad 15 28 D Tsvt af Artificial fill Qhbm af Qhc 15 Tsvm 2. William Lettis & Associates, Inc., 1777 Botello Drive, Suite 262 Walnut Creek, CA 94596 Qhbm afbm 35 18 25 Qa 18 Qoa Qhbm 16 Qha Tsvt Tsvr afbm Artificial fill placed over bay mud. Qhbm Qls KJfsch Qhf Franciscan complex melange. Tectonic mixture of masses of resistant rock including af Qhbm 40 30 KJfm Qhf Tpm sandstone, altered mafic volcanics (greenstone), chert, gabbro, exotic Qhc Qls alf Artificial levee fill Qhf KJfm Tsvr metamorphic rocks imbedded in a sheared shaley matrix. Blocks with melange Qls Tpm large enough to be shown at this scale are denoted as: KJfsch alf Tpm? 62 Qha Qhbm 43 Tsvm ac Artificial stream channel Tv Qhbm Qha Qls ss - sandstone Tsvr afbm Qls 40 Tsvr Qhc Late Holocene to modern (<150 years) stream channel deposits in active, mv - metavolcanic rock af Qha Qhbm alf 46 natural stream channels. Consists of loose alluvial sand, gravel, Tv alf 63 ch - chert alf Qls Qha and silt. Qls KJfm 79 Tsvr afbm af 44 30 Qhty Latest Holocene stream terrace deposits. Stream terraces are deposited gs - greenstone (altered mafic volcanic rocks). Tv Qhf as point bar and overbank deposits. Qhbm 55 Tsvm? - Blueschist block Tpu? 42 Tpl Tdr? Qhbm Qhbm Qhf Qls Qhay Latest Holocene alluvial deposits. Fluvial sediment deposited on the Qa Qhc KJfsch Qhc modern flood plain. KJsch Franciscan Complex schist, phyllite, and semischist. Qls Qls 45 Qls Qhbm Qhbm Tdm? Qha alf 43 Qhbm alf alf Tpu? Tpl? Qhb Qhbm Holocene (<10,000 years) bay mud. Silt, clay, peat, and fine sand deposited Tdm? KJfsch afbm at or near sea level in San Pablo Bay. sp Serpentinized ultramafic rocks. Qf Qls af Qhb Qls Qhf Holocene alluvial fan deposits. Sand, gravel, silt, and clay deposited by Tdm? streams emanating from canyons onto alluvial valley floors. Qhf Qhbm Qhbm Qha Sediment is poorly to moderatly sorted and bedded. Unit Correlation Qha Qhb Qha Tpm? Tdm? Tdm Qht Holocene stream terrace deposits. Sediment deposited in point-bar and Qls overbank settings. Includes sand, gravel, silt, and minor clay. af afbm alf ac Qhbm Moderately to well-sorted and bedded. Qhc Qhty Qhay Holocene KJfm KJfm? Qha Holocene alluvium, undivided. Alluvium deposited on fans, terraces, or Qhbm Qht Qha Qhf af Qhc Qhb Qf in basins. Sand, gravel, and silt that are poorly sorted. Qa } Qhbm af Qls Qhf Trt Qpf Qc Qls Quaternary 34 Tp? Qhb Holocene basin deposits. Fine-grained alluvium with horizontal stratification. Qhbm Qhbm Qhbm May have interbedded peat. Qoa Pleistocene KJfm KJfsch Qf Qhbm 50 35 KJfm Qhf af alf } } Qf Latest Pleistocene (<~30,000 years) to Holocene alluvial fan deposits. Sand, Tdm gravel, silt and clay mapped on gently sloping, fan-shaped, relatively QTu Qhf 34 Qhbm Trt Tpm undissected alluvial surfaces. Qls afbm Qls alf 30 79 Latest Pleistocene to Holocene alluvium, undivided. Flat, relatively undissected Qls Qa L fan, terrace, and basin deposits. Tsvm a k Trt Tpu alf e v Trt? Tsv Tsvt Qhf Qhf i af lle Tsvr Qls F Tp Tpm Qls a Qpf Latest Pleistocene fan deposits. Sand, gravel, silt, and clay that is Qa u l afbm t Trt? moderately to poorly sorted and bedded. Mapped on alluvial Qa Qhf fans where greater dissection indicates latest Pleistocene age. Tpl KJfm KJfsch Qa Qha Qhty Tdm? Qc Colluvium. Unconsolidated and unsorted weathered rock fragments 45 KJfm 20 Trt? accumulated on or at the base of slopes. Qhc Qhay 45 Tdm Miocene Tertiary KJfm Qhbm Qls Qha Qhty Qhay 20 Landslides. Includes debris flow and block slump landslides. Arrows Qls alf Qhbm Qls af Qc Qhbm 50 indicate direction of movement. Tv Qls KJfsch Qls Qls alf 25 Qhbm 29 Tpu Qhay 35 Qoa Early to late Pleistocene alluvial deposits, undivided. Alluvial fan, stream ch Qhbm Qhty Qhf terrace, basin, and channel deposits. Topography is gently rolling Tvbm Qhf afbm 30 Qhty Qc with little or no original alluvial surfaces preserved; moderately to Qhty Qhc deeply dissected. ch 30 Tvr Qc Qhc Qa Qc Qhbm QTu Gravel, sand, reworked tuff and clay of unknown age. Sediments derived KJfm KJfm Tpm 50 mostly from Sonoma Volcanics. KJfm Qls Qls Qht Qa Qls Qc Ts sp Petaluma Formation. A predominantly lacustrine and fluvial deposit with esturine } gs KJfm } Qha Qc Qls Qls sp KJfm Qls and transitional marine horizons consisting of siltstone, sandstone, shale, KJfm Qc Qhbm alf Qls Qls Qhbm Tpu Qls Qc Qhf conglomerate, with minor silicified tuff, chert, lignite, and limestone. Qls Qls Qls ch Qls KJfm Kn KJfm sp Qls 33 Divided into three subunits: KJfm KJfsch KJfm Qc Qc sp Qc alf Trt Tpu sp Qa KJfm Cretaceous/ Qls Qls Tpu- Upper Petaluma Fm. Massive, well sorted sandstone, siltstone, Qls Tp Qls Qa Qhbm Qhf Tpm Jurassic sp KJfsch Qc and conglomerate. Conglomerate is rich in laminated siliceous Qha KJfm Qls Qc sp Qhbm shale (Monterey Fm.) fragments and Tertiary volcanics, with } Tpl Qhf alf Franciscan clasts. The Robler Tuff (Trt), dated at 6.26 Ma (Robert Qa Qha Qls Qhbm Fleck, written communication) is interbedded with the Upper Petaluma. Symbol Explanation Qhc Qls afbm KJfsch Qls af Contact between map units - solid where accurately located, dashed where KJfsch Qha Tpm- Middle Petaluma Fm. Siltstone and sandstone with interbedded Qls 15 alf Qhbm approximately located; short dash where inferred; dotted where concealed. KJfsch Qhbm conglomerate.Clasts in conglomerate are mostly pebbles derived Qls Ts Qhf 25 31 sp Qha from the Franciscan, but clasts of Cretaceous and Tertiary sandstone Ts alf 27 Fault - solid where accurately located, dashed where approximately located; 25 Qls sp Ts 20 Qls Qc as well as Tertiary volcanics are present. Minor siliceous shale short dash where inferred; dotted where concealed. U = upthrown block, Ts Ts Qls KJfsch sp fragments from the Monterey Formation are also present. D = downthrown block. Arrow and number indicate direction and angle KJfsch Qls Qoa Tv Qls af of dip of fault plane. Qls mv Qls Qls Qls Qhbm Tpl- Lower Petaluma Fm. Dominantly bluish to green clayey siltstone and Qhbm Qc shale with interbeds of silicified tuff, siliceous limestone, lignite, 34 Ts Thrust Fault- solid where accurately located; dashed where approximately KJfm afbm alf and rare bituminous chert. Laminated siltstone near the base in Qha Qls located; short dash where inferred; dotted where concealed. Barb located Qls Tvbm Qls Qhf places. Localities near Tolay Creek and elsewhere have yielded Qc Qhbm alf on upthrown block. Qc alf transitional marine and estuarine horizons in a predominantly KJfm Qls Qls lacustrine and fluvial deposit Overturned Anticline - Dashed where approximately located. Qc Qhbm Sonoma Volcanics- Mafic lava flows, breccias, agglomerate tuff, tuff breccia with sp interbedded fuffaceous sediments; also includes dacitic to rhyolitic lava Anticline - Dashed where approximately located. KJfm Tvbm KJfm Qhbm flows, debris flows, tuff, and tuffaceous sediment. The age range for the Qc gs KJfsch Ts KJfsch Tsvm Sonoma Volcanics on this quadrangle is 8.65 to 3.80 Ma (Fox and others, Tvbm Syncline - Dashed where approximately located. Qc Tvbm 1985; Youngman, 1989). The Sonoma Volcanics are divided into the alf Tsv Tsvt Qc Qhf following subunits. Strike and dip of sedimentary beds: Qhbm Tvsr alf Tsvm- Mafic flows and breccias. Andesite and basaltic andesite. Age KJfm Qhbm Qls Qls range is 7.28 to 3.80 Ma (Youngman, 1989). 25 Inclined Tvbm Tvbm afbm Qc Qls Tsvt- Silicic tuff and interbedded tuffaceous sediments. Interbedded sand 65 Qls Qhbm Overturned Tvbm KJfm and gravel is similar to the MIddle Petaluma Formation. Qls Qc Tsvr- Rhyolitic to dacitic flows, breccias, and sediments. Pink, white, gray, Horizontal Qc Tvbm brown flow banded rhyolite in flows, debris flows and breccia. KJfm alf Interbeds of sand, gravel, and tuff. Dates (Ar/Ar) range from 7.36 Landslide - arrows indicate principal direction of movement. Queried Tvbm to 8.11 Ma (Youngman, 1989). where questionable. Ts KJfsch Qls Qhbm Qhbm Donnell Ranch Volcanics of Youngman (1989). Basalt and basaltic andesite flows, breccia, and scoria. Cream colored tuff is interbedded with the Qhf KJfm Tdm mafic volcanics. The age range for the Donnell Ranch Volcanics is 10.64 Ma afbm Qhbm to possibly as young as 8.52 Ma (Youngman, 1989). Part of the Tolay Volcanics References Qhbm of Morse and Bailey (1935). sp KJfm Qhbm Blake, M.C. Jr., Graymer, R.W., and Jones D.L., 2000, Geologic map and database of parts of Marin, San Francisco, Alameda, KJsch Tv Tertiary volcanic rocks - Mafic volcanic rocks, mostly basaltic andesite, similar to and Contra Costa, and Sonoma counties, California: U.S.
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