Plate Stratigraphic & Structure Cross Sections 11 E - E’ - A-A' - - B-B' - C-C' - D-D' - E-E' Ap SB PR2 Ap SB PR1 Hwy 12 G G Hwy 290 Hwy 281 TION Austin = grains = frame builders = skeletal = micritic limestone = gypsum/anhydrite = springs Blanco River # Cypress Creek G F S M # = Sequence boundaries Stratigraphic notes: 1- Edwards Group, Kainer Fm, as defined by Rose (1972). Figure modified from Stricklin & Scott, 2007 Lozo, 1971 and R.W. G G ApSBPR1 M M MM M M M M M M # # S F S F Buda S M S M S G F S G F G G A’ S S S S Kyle S S # # A EXPLAN D’ San Wimberley Limestone (micr) Limestone (skel) Limestone (reef) Dolomite Shale/marl Gypsum/anhydrite Siliciclastic (silt, clay) Siliciclastic (sand, silt) Conglomerate Marcos (Kgrl) (Kha) E’ (Kcc) Lower Upper (Kgru) Hosston Hammett Explanation (Ksy/Kho) Sligo (Ksl) Glen Rose Glen Rose Sycamore/ Lakeway Cow Creek Hensel (Khe) B
B’ Travis
LOWER CRETACEOUS LOWER Hays
Springs
Blanco Dripping
Lowerr Aptian Lowerr
Upper Aptian Upper Hautervian - Valanginian Upper Aptian - Lower Albian Lower - Aptian Upper Woodcreek
Barremian (1)
Alluvium Edwards Upper Glen Rose Lower Glen Rose Hensel Cow Creek Hammett Sligo Hosston/ Sycamore Paleozoic
Upper Trinity Upper Trinity Middle Lower Trinity Lower Comal A
TION
C Upper Glen Rose Glen Upper Rose Glen Lower Creek Cow Hensel Sligo Hosston Hamm. Pz Ksl Qal Kcc Ked Khe Kha Kgrl Kgru D Blanco
Kho/Ksy C’ TRINITY GROUP TRINITY E Johnson City EXPLANA M M MM M M M M MM M M S S S F S F ft msl 1600 1400 1200 1000 800 600 400 200 0 1 mi Middle Trinity Aquifer Trinity Middle Confining Unit Confining Unit 0.5 DATUM E’ E’ Pan East VE = 50 X East # # Pan ft 50 Hammett: Hammett: 100 Geophysical Log & Samples Line intersection w/ B-B’ Line intersection Middle Trinity Aquifer Trinity Cow Creek: Middle Geophysical Log & Samples Geophysical Log Confining Unit & Minor Aquifer Hensel: Confining Unit & Minor Ap SB PR2 Lower Glen Rose: (1)(2) Wyn Ap SB PR1 Ap SB PR1 Karst Karst Geophysical Log RIVER BLANCO Wyn Lower Trinity Lower Geophysical Log Carbonate Aquifer Carbonate Sligo:
“CA” Regional Marker Sequence boundaries & ages (2) after Scott et al., (2007) RIVER BLANCO S FS F WIMBERLEY FAULT ZONE # # S S S S S S LasM3 # # LasM3 10,000 ft Geophysical Log & Samples Hosston: Wall1 Geophysical Log & Samples G G Samples 5,000 VE= 25 X Early Miocene-age Faulting S S Lower Trinity Clastic Aquifer Clastic Trinity Lower S FS F OM CREEK FAULT ZONE T 0 ft 200 100 Wall1 Samples Pz Upper Trinity Upper Ksl Kcc Khe Kha Kho Kgrl Limited Aquifer Limited Upper Glen Rose: Shel G G Geophysical Log S S S S S S S S Mane2 Samples S F S F Arr Geophysical Log Offline one mile NW Offline Lithology from Lederman Well Arr BLANCO RIVER PALEOZOIC Geophysical Log RIVER BLANCO Shell core - Burnet Ranch #1 Nel Nel Normal fault, Geophysical Log down-to-the-west Geophysical Log RIVER BLANCO B. Hunt & S. Musick S F S F Little Blanco measured section Sligo Sligo G G S S
M M HAYS CO. HAYS Nar RIVER BLANCO Shell Core Nar BLANCO RIVER Shell Core 11-2 STRUCTURE CROSS SECTION E-E’ STRUCTURE CROSS 11-2 line 1986). The karst may be associated with the Wimberley fault and the Blanco River, surface following water, fracturing, move down gradient where to meteoric water and the porous reef. The Wall1 well also has a missing upper reef section although a mid-section mound is well devel oped. Silty, dolomitic, and micritic limestone sediment fill the basin in the Upper Glen Rose Uplift. and A cover the basal Llano Upper described at the LasM3 well. Glen Rose anhydrite bed was Hinge change change
and Wesley Schumacher and Wesley BLANCO CO. BLANCO Khe facies Khe facies S S Hinge line Alex S. Broun, P.G., Douglas A. Wierman, P.G. Douglas P.G., Alex S. Broun, RIVER Blanco River Dip Cross Section River Dip Cross Blanco BLANCO SLIGOSLIGO Pinchout Pinchout Qal Stl Stl Geophysical Log S S Geophysical Log STRATIGRAPHIC CROSS SECTION E-E’ SECTION CROSS STRATIGRAPHIC 11-1 DATUM Hosston Hosston Hammett Hammett Cow Creek Cow Creek Upper Glen Rose Lower Glen Rose M M M M M M Scattered biostromes at mound upper Well-developed section. of this line the along level sub- are the in and outcrop the at observed are intermittent reefs facies LasM3, Wall1, and Arr, Pan surface wells. at The Wyn west of Wimber- well, drilled close to the Blanco River, ley, is missing the reef section (possibly due to karst development). Over a 20-30 foot interval the gamma curve indicates shale and the resistivity same the curves at well, show nearby a from Samples resistivity. low stratigraphic interval, have cuttings of red clay, red- brown pisolites, breccia and incrusted limestone frag- ments. The clay is interpreted as terra rossa, washed (Young, post-Pleistocene the in cave the into and down - - Hensel Hensel Normal fault, down-to-the-west Sey Datum top of Cow Creek Sey Geophysical Log Geophysical Log CieF Geophysical Log Lithology from Brushy Top W3A Top Lithology from Brushy five miles North Offline and Tops Wilson; Fm. F. After W. A. S. Broun Interpretation The Section): Dip River (Blanco E-E’ Section Cross section is 25 miles long. Trinity-age rocks increase in feet 700 estimated an from southeast, the to thickness to over 1000 feet at the Pan allu well. an in The silts and sands Hosston with conglomerate thick tains con- vial fan/delta-plain facies proximal to the Llano Uplift. The Sligo pinches out near the Blanco - Hays County marine line. It is overlain by transgressive, quiet water, Hammett shale that onlap, but do not cover the uplift. The Cow Creek, 70-90 feet thick, becomes ingly increas carbonate to the southeast with an upper grain limestone and a well-developed dolomite section. The change facies The uplift. the covers facies sand Hensel with the Lower Glen Rose occurs between the StI well and the Narrows outcrop. (Scott, 2007) is limited to about The 5 miles along section. Narrows biostrome est E E Cie Cie W West w/ C-C’ 0 800 600 400 200 2007 Geophysical Log
1400 1200 1000 1600 Geophysical Log ft msl Line intersection (1) Contact Lower-Upper Glen Rose BLANCO RIVER After Scott et al.
(1)
Dinosaur tracks Stratotype Surface Sec.
Creek
PALEOZOIC Sycamore / Hosston / Sycamore Lower Glen Rose Glen Lower Hensel Upper Glen Rose Glen Upper Hamm. Cow ft 0 100 200 300 400 -400 -300 -200 -100