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all geography including DSDP/ODP Sites and Legs
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Africa
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North Africa
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Atlas Mountains
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High Atlas (1)
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Sr-87/Sr-86 (4)
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Sr-87/Sr-86 (4)
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lead
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Pb-208/Pb-204 (1)
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Invertebrata
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Cenozoic
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Tertiary
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Neogene
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Miocene
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Fleming Formation (1)
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Pliocene
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lower Pliocene (1)
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Paleogene
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Eocene
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Green River Formation (1)
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middle Eocene
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Claiborne Group (2)
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Oligocene
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Frio Formation (1)
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Vicksburg Group (1)
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Paleocene (1)
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Sespe Formation (1)
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Wilcox Group (2)
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upper Cenozoic
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Pico Formation (1)
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Mesozoic
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Cretaceous
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Comanchean
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Comanche Peak Limestone (1)
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Edwards Formation (1)
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Glen Rose Formation (2)
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Pearsall Formation (1)
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Lower Cretaceous
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Albian
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upper Albian (1)
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Aptian
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lower Aptian (1)
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Comanche Peak Limestone (1)
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Edwards Formation (1)
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Glen Rose Formation (2)
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Hosston Formation (1)
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Pearsall Formation (1)
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Sligo Formation (1)
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Middle Cretaceous (2)
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Upper Cretaceous
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Campanian (1)
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Gulfian
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Aguja Formation (1)
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Eagle Ford Formation (3)
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Woodbine Formation (1)
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Tuscaloosa Formation (1)
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Great Valley Sequence (1)
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Jurassic
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Carmel Formation (1)
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San Rafael Group (1)
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Upper Jurassic
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Entrada Sandstone (1)
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lower Mesozoic (1)
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Triassic
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upper Mesozoic (1)
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Paleozoic
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Bedford Shale (1)
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Carboniferous
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Lower Carboniferous
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Dinantian (1)
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Mississippian
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Lower Mississippian
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Cuyahoga Formation (1)
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Middle Mississippian
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Visean (1)
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Pennsylvanian
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Lower Pennsylvanian (1)
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Middle Pennsylvanian
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Paradox Formation (1)
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Devonian
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Emsian (1)
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Old Red Sandstone (1)
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Ordovician
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Upper Ordovician
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Permian (2)
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Silurian
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Lockport Formation (1)
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Lower Silurian
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Llandovery
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Qalibah Formation (1)
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Woodford Shale (1)
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Precambrian
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upper Precambrian
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Proterozoic
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igneous rocks
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framework silicates
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silica minerals
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ring silicates
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sulfates
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Primary terms
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absolute age (15)
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Africa
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North Africa
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Atlas Mountains
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Moroccan Atlas Mountains
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High Atlas (1)
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-
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Morocco
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Moroccan Atlas Mountains
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High Atlas (1)
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-
-
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Asia
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Arabian Peninsula
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Saudi Arabia (1)
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-
Far East
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Japan
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Honshu
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Iwate Japan (1)
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Middle East
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Iran (1)
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Atlantic Ocean
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Australasia
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bibliography (2)
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boron
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B-11/B-10 (1)
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Canada
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Western Canada
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British Columbia (1)
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carbon
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C-13/C-12 (1)
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C-14 (2)
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Caribbean region
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West Indies
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Antilles
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Greater Antilles
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Puerto Rico (1)
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-
-
-
-
Cenozoic
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Quaternary
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Holocene
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upper Holocene (2)
-
-
Pleistocene
-
Bandelier Tuff (1)
-
upper Pleistocene (2)
-
-
upper Quaternary (2)
-
-
Tertiary
-
Calipuy Group (1)
-
Catahoula Formation (1)
-
Neogene
-
Miocene
-
Fleming Formation (1)
-
upper Miocene (1)
-
-
Pliocene
-
lower Pliocene (1)
-
-
-
Paleogene
-
Eocene
-
Green River Formation (1)
-
middle Eocene
-
Claiborne Group (2)
-
-
-
Oligocene
-
Frio Formation (1)
-
Vicksburg Group (1)
-
-
Paleocene (1)
-
Sespe Formation (1)
-
Wilcox Group (2)
-
-
-
upper Cenozoic
-
Pico Formation (1)
-
-
-
Central America
-
Costa Rica
-
Nicoya Peninsula (1)
-
-
Guatemala
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Santiaguito (1)
-
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Honduras (2)
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crust (2)
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Europe
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Spain
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Asturias Spain (1)
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-
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Western Europe
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Scandinavia
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Sweden
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Gotland Sweden (1)
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United Kingdom
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England (1)
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Scotland
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S-type granites (1)
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volcanic rocks
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Invertebrata
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Bivalvia (2)
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Turritellidae
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Turritella (1)
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Protista
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Foraminifera
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Miliolina (1)
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Textulariina
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Lituolacea
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Orbitolinidae (1)
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Radiolaria (1)
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isotopes
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radioactive isotopes
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Be-10 (2)
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C-14 (2)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
-
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stable isotopes
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B-11/B-10 (1)
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C-13/C-12 (1)
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Nd-144/Nd-143 (1)
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O-18/O-16 (4)
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Pb-206/Pb-204 (1)
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Pb-207/Pb-204 (1)
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Pb-208/Pb-204 (1)
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Sr-87/Sr-86 (4)
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lineation (1)
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magmas (5)
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mantle (1)
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maps (10)
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Mesozoic
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San Marcos quadrangle
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Journal Article
The geology of San Marcos Quadrangle, Texas
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
Published: 01 August 1927
AAPG Bulletin (1927) 11 (8): 825–851.
Journal Article
The Geology of the San Marcos Quadrangle, Texas
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
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...
Image
—Uvalde terrace. Part of San Marcos Quadrangle 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 San Marcos Quadrangle 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 San Marcos Quadrangle 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
Anorthite from California
Journal: American Mineralogist
Publisher: Mineralogical Society of America
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
Quaternary Deposits of Texas Coastal Plain Between Brazos River and Rio Grande
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
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...
Journal Article
Petrology of the San Marcos gabbro, southern California
Journal: GSA Bulletin
Publisher: Geological Society of America
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
Hydrologic evolution of the Edwards Aquifer recharge zone (Balcones fault zone) as recorded in the DNA of eyeless Cicurina cave spiders, south-central Texas
Journal: Geology
Publisher: Geological Society of America
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...
Journal Article
Pre-Cretaceous Rocks of Northwestern Honduras: Basement Terrane in Sierra de Omoa
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
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...
Journal Article
Geology and Exploration for Oil in Salinas Valley, California
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
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...
Journal Article
Sespe Formation, California
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
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...
Journal Article
Geologic Input Databases for the 2025 Puerto Rico—U.S. Virgin Islands National Seismic Hazard Model Update: Crustal Faults Component
Jessica Thompson Jobe, Richard W. Briggs, Uri ten Brink, Thomas L. Pratt, Kenneth Stephen Hughes, Alexandra E. Hatem, Christopher B. DuRoss, Nadine G. Reitman, Julie A. Herrick, Sylvia Nicovich, Camille M. Collett, Katherine M. Scharer, Stephen B. DeLong
Journal: Seismological Research Letters
Publisher: Seismological Society of America
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...
Journal Article
Regional assessment of the Eagle Ford Group of South Texas, USA: Insights from lithology, pore volume, water saturation, organic richness, and productivity correlations
Ursula Hammes, Ray Eastwood, Guin McDaid, Emilian Vankov, S. Amin Gherabati, Katie Smye, James Shultz, Eric Potter, Svetlana Ikonnikova, Scott Tinker
Journal: Interpretation
Publisher: Society of Exploration Geophysicists
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...
Journal Article
Subsurface Lower Cretaceous Formations of South Texas
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
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...
Journal Article
Cretaceous and Paleocene of Santa Lucia Range, California
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
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...
Journal Article
Late Triassic stratigraphy and facies from northeastern Mexico: Tectonic setting and provenance
José Rafael Barboza-Gudiño, Aurora Zavala-Monsiváis, Gastón Venegas-Rodríguez, Luís Daniel Barajas-Nigoche
Journal: Geosphere
Publisher: Geological Society of America
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...
Includes: Supplemental Content
Journal Article
Synextensional Pliocene–Pleistocene eruptive activity in the Camargo volcanic field, Chihuahua, México
José Jorge Aranda-Gómez, James F. Luhr, Todd B. Housh, Charles B. Connor, Tim Becker, Christopher D. Henry
Journal: GSA Bulletin
Publisher: Geological Society of America
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...
Journal Article
Paleogeography of Parts of Border Province of Mexico Adjacent to West Texas
Journal: AAPG Bulletin
Publisher: American Association of Petroleum Geologists
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...
Journal Article
CENOZOIC TURRITELLIDAE (GASTROPODA) FROM SOUTHERN PERU
Journal: Journal of Paleontology
Publisher: Paleontological Society
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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