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San Marcos quadrangle

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Journal Article
Journal: AAPG Bulletin
Published: 01 August 1927
AAPG Bulletin (1927) 11 (8): 825–851.
Journal Article
Journal: AAPG Bulletin
Published: 01 August 1927
AAPG Bulletin (1927) 11 (8): 825–851.
...E. W. Brucks ABSTRACT The San Marcos quadrangle is located on the landward edge of the Texas Gulf Coastal Plain, about 60 miles southeast of the Texas Central Mineral Region. The area of the quadrangle is about 1,060 square miles, or nearly 2 1 25 of the area of Texas. The surface formations...
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Image
—Uvalde terrace. Part of <span class="search-highlight">San</span> <span class="search-highlight">Marcos</span> <span class="search-highlight">Quadrangle</span> topograhic sheet showing pos...
Published: 01 December 1945
Fig. 9. —Uvalde terrace. Part of San Marcos Quadrangle topograhic sheet showing position and slope of Uvalde terrace from Kyle in Hays County southeastward through Lockhart in Caldwell County. Ridge southwest of Uvalde terrace, on which Koeglar Hill is located, is covered with siliceous gravel
Image
—Map showing location of the <span class="search-highlight">San</span> <span class="search-highlight">Marcos</span> <span class="search-highlight">Quadrangle</span> in Texas
Published: 01 August 1927
FIG. 1. —Map showing location of the San Marcos Quadrangle in Texas
Image
Map showing areal geology of the <span class="search-highlight">San</span> <span class="search-highlight">Marcos</span> <span class="search-highlight">Quadrangle</span> of Texas. Base map: ...
Published: 01 August 1927
FIG. 2. Map showing areal geology of the San Marcos Quadrangle of Texas. Base map: reproduction U. S. Geol. Survey Topographical Sheet of San Marcos Quadrangle of Texas.
Journal Article
Published: 01 March 1935
American Mineralogist (1935) 20 (3): 139–146.
...Franklin S. Miller Abstract In the course of a petrologic study of the San Marcos gabbro, 1 in the San Luis Rey quadrangle, California, it was found that the olivine-bearing phases of the rock are composed predominantly of a plagioclase feldspar which falls well within the composition range...
Journal Article
Journal: AAPG Bulletin
Published: 01 December 1945
AAPG Bulletin (1945) 29 (12): 1693–1720.
...Fig. 9. —Uvalde terrace. Part of San Marcos Quadrangle topograhic sheet showing position and slope of Uvalde terrace from Kyle in Hays County southeastward through Lockhart in Caldwell County. Ridge southwest of Uvalde terrace, on which Koeglar Hill is located, is covered with siliceous gravel...
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Journal Article
Journal: GSA Bulletin
Published: 01 October 1937
GSA Bulletin (1937) 48 (10): 1397–1426.
...FRANKLIN S. MILLER Abstract INTRODUCTION AND ACKNOWLEDGMENTS This paper includes the results of a petrologic investigation of the gabbroid rocks of the San Luis Rey Quadrangle, Southern California (Fig. 1). The unusual features of these rocks were recognized by Professor E. S. Larsen during his...
Journal Article
Journal: Geology
Published: 01 April 2009
Geology (2009) 37 (4): 339–342.
... that are differentially rotated and ramp away from the San Marcos Platform, the primary structural high point in the escarpment ( Abbott, 1975 ; Maclay and Land, 1988 ; Collins and Hovorka, 1997 ; Collins, 2000 ; Ferrill et al., 2004 ). Figure 3. Parallel evolution of Cicurina cave spider habitat and Edwards...
FIGURES
Journal Article
Journal: AAPG Bulletin
Published: 01 April 1976
AAPG Bulletin (1976) 60 (4): 566–583.
... isochron diagrams ( Fig. 7 ). The isochron ages for three intrusive units from the Quebrada Seca, San Marcos, and Banaderos areas ( Fig. 5 ) were calculated using the least-squares method of York (1966). The errors on these ages are given at the 95-percent confidence level and the errors used in the age...
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Journal Article
Journal: AAPG Bulletin
Published: 01 December 1948
AAPG Bulletin (1948) 32 (12): 2254–2268.
... is the division of the basin into the three main fault blocks in Eocene time. These fault blocks had a marked influence both on the later structural developments and on Tertiary sedimentation. One, here named the Southwest block, lies between the Nacimiento and San Marcos faults; the second, the Central block...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1929
AAPG Bulletin (1929) 13 (5): 489–507.
... Mountains between San Marcos Pass, near Santa Barbara, and Sespe Canyon, in central Ventura County. Like the red beds of other regions, this formation has given rise to much speculation. It is generally considered to mark an arid stage in the climatic history of the Tertiary period (4, p. 752; 6, p. 13; 9...
FIGURES
Journal Article
Published: 08 October 2024
Seismological Research Letters (2024)
... for Not Including in Databases San Marcos Limited evidence of Quaternary activity in published, peer‐reviewed literature ( Geomatrix Consultants, 1988 ; Piety et al. , 2018 ; Thompson Jobe, Briggs, Hughes, et al. , 2024 ); and no dated deposits San Francisco No evidence of Quaternary activity...
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Journal Article
Journal: Interpretation
Published: 25 February 2016
Interpretation (2016) 4 (1): SC125–SC150.
... volume (PHIT), organic matter (TOC), and water-saturation ( S W ) variations has not been presented to date. Therefore, isopach maps across the Eagle Ford Shale play west of the San Marcos Arch were constructed using thickness and log-calculated attributes such as TOC, V clay , S W , and porosity...
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Journal Article
Journal: AAPG Bulletin
Published: 01 October 1945
AAPG Bulletin (1945) 29 (10): 1416–1469.
... are considerably thicker than equivalent beds in East Texas; (8) that the surface of the Edwards limestone in the area of the San Marcos arch was subjected to considerable erosion prior to Fort Worth time; (9) that the Kiamichi formation is represented in South Texas by a sequence of black limestone and shale...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1944
AAPG Bulletin (1944) 28 (4): 449–521.
... the Paleocene and the lower Miocene. This is clearly shown in the northeast part of the Adelaida Quadrangle. On the southwest side of the San Marcos fault the lower Miocene rests on and transgresses several thousand feet of Asuncion and Dip Creek beds that dip northeast at a high angle toward the fault...
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Journal Article
Journal: Geosphere
Published: 01 October 2010
Geosphere (2010) 6 (5): 621–640.
... of basement uplift areas or horsts during early Mesozoic time. Uplifts were probably separated by elongate grabens occupied by trunk streams of the fluvial systems, as proposed by Michalzik (1991) . The best-exposed and best-preserved of these depocenters is the San Marcos–El Alamar area of southern Nuevo...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 2003
GSA Bulletin (2003) 115 (3): 298–313.
... field is located near the San Marcos fault, which is a major structure that can be traced on the surface for ∼300 km ( Fig. 1 ) across the state of Coahuila. At the Chihuahua-Coahuila state line, the fault trace appears to end abruptly against the eastern branch of the Bolsón de Mapimí, a major Basin...
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Journal Article
Journal: AAPG Bulletin
Published: 01 April 1936
AAPG Bulletin (1936) 20 (4): 417–432.
... of the basement complex which composed the ancient land mass. A suite of rocks from very coarse conglomerates in the San Marcos valley is almost identical with a suite collected from the igneous, metamorphic, and sedimentary rocks of Paleozoic (?) age which crop out in places along the eastern side of the Acatita...
FIGURES
Journal Article
Published: 01 March 2007
Journal of Paleontology (2007) 81 (2): 331–351.
... Natural, Universidad Nacional Mayor de San Marcos, Lima, Peru; OSU—Orton Museum, Ohio State University, Columbus, USA; PRI—Paleontological Research Institution; SGO.PI.—Departamento de Paleontología de Invertebrados, Museo Nacional de Historia Natural, Santiago, Chile; USNM—United States National Museum...
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