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Topic: Balcones Fault

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Balcones Escarpment

Texas Hill Country

Barton Springs

Edwards Plateau

North Texas

Austin, Texas

Ouachita Mountains

Llano Uplift

Mount Bonnell

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San Marcos, Texas

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Escarpment

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	Faults and Caves
		Many of the normal faults of the Balcones Fault Zone are surrounded by zones of highly fractured strata.
		This one came to light during excavation for construction of the Target near the corner of 1604 and Bandera Rd. and was subsequently covered by a retaining wall.
		A limestone fault on the Edwards Plateau exposed by a roadcut on U.S. north of San Antonio.
	www.edwardsaquifer.net /faults.html (601 words)

	Balcones Fault - Karr.net (Site not responding. Last check: )
		The Balcones Fault is a zone of normal faulting in Texas (USA) that runs approximately from the southwest part of the state to the north central region.
		The Balcones Fault zone is not active today, and is in one of the lowest risk zones for earthquakes in the United States.
		The surface expression of the fault is the Balcones Escarpment, which forms the eastern boundary of the Texas Hill Country and the western boundary of the Texas Coastal Plain and consists of cliffs and cliff-like structures.
	www.deepsouthtexas.com /encyclopedia/Balcones_Fault (426 words)

	Balcones Fault Information
		The Balcones Fault is a zone of normal faulting in Texas (USA) that runs approximately from the southwest part of the state to the north central region.
		The Balcones Fault zone is not active today, and is in one of the lowest risk zones for earthquakes in the United States.
		The surface expression of the fault is the Balcones Escarpment, which forms the eastern boundary of the Texas Hill Country and the western boundary of the Texas Coastal Plain and consists of cliffs and cliff-like structures.
	www.bookrags.com /wiki/Balcones_Fault (286 words)

	Structural Style in an En Echelon Fault System, Balcones Fault Zone, Central Texas: Geomorphologic and Hydrologic ...
		Generally, the rocks exposed at the surface west of the fault zone are Lower Cretaceous stiatigiaphic units consisting of resistant limestones, dolomites, and marls; east of the zone, the rocks exposed are Upper Cretaceous, nonresistant chalk and calcareous clay units.
		The overall structural grain of the faulting in the ramp is consistent with the regional Balcones fault zone, with the larger-displacement faults having a northeastward orientation, but with the smaller cross faults oriented in all directions.
		Not long after Balcones faulting occurred (currently believed to be during the Miocene), the stratigraphic units exposed in the vicinity of the en echelon faults and associated ramp structure in the study area were Upper Cretaceous or younger.
	www.lib.utexas.edu /geo/balconesescarpment/pages71-76.html (0 words)

	HsCh13 (Site not responding. Last check: )
		The fault planes dip south and the down-dropped block is to the south toward the GOM.
		Balcones faulting accommodated the rapid increase in sediment-load subsidence caused by the dramatic increase in sediment supply.
		Normal faulting, warping and volcanism is confined to the margins of the plateau.
	ccollege.hccs.cc.tx.us /instru/PHYSCI/geo/cate/historical/HsCh13.htm (1737 words)

	Chapter 3
		With normal faults, the movement is such that the fault plane dips, usually steeply, toward the side of the fault where the rocks have dropped.
		Faults observed at the surface are a warning that the bedrock in an area may be inhomogeneous.
		To the west of the fault zone in the Austin area, at depths of 100 to 650 meters (300 to 2000 feet), are Precambrian granites and strongly metamorphosed rocks, and Paleozoic rocks, mostly hard limestones.
	www.lib.utexas.edu /geo/ggtc/ch3.html (0 words)

	Tour Guide Information
		The two regions in the San Marcos area are: the Hill Country (also known as the Edwards Plateau) and the Gulf Coast Plain; the Balcones Escarpment divides the two.
		Although the Balcones Fault Zone is generally considered to be inactive, some scientists suggest the earthquakes that occured just east of Austin in 1873 and 1902 were caused by movement along the eastern part of the fault system (Swanson, 1995).
		The Hill Country was also being eroded and this contributed to the load (the "overburden") on the newly formed coastal plain.
	www.wonderworldpark.com /caveedu12.htm (0 words)

	Travel Times Along Selected Flow Paths of the Edwards Aquifer, Central Texas
		The Balcones fault zone is characterized by a series of en echelon faults that trend southwest to northeast along the length of the region (fig.
		Locations of major faults within the Hill Country and Balcones fault zone are shown in figure 2 along with the location of positive anticlinal features in the pre-Cretaceous surface and the outcrop of igneous intrusions.
		The Woodard Cave and Mount Bonell faults mark the southeastern boundary of major blocks of the Edwards aquifer, juxtaposing the Trinity aquifer to the northwest with the Edwards aquifer to the southeast (Small, 1986).
	water.usgs.gov /ogw/karst/kigconference/elk_traveltimes.htm (4834 words)

	Development of Management Tools for
		The Balcones Fault Zone is a narrow geologic area that spans the state from the Rio Grande to the Red River and consists of broken rock formations, or faults.
		This faulting has displaced the geologic formations within the County causing the older geologic formations to outcrop in the western portion of the County and the younger geologic formations to erode and deposit in the topographically lower elevations in eastern Bell County.
		This fault zone is also responsible for the discontinuities of the three aquifers as they extend southeastward and it is these discontinuities that provide the dual characteristics of the Edwards (BFZ) aquifer and control the flow of groundwater in all three aquifers throughout the County.
	gis.esri.com /library/userconf/proc02/pap0710/p0710.htm (4346 words)

	[No title] (Site not responding. Last check: )
		At the east foot of Mt. Bonnell (away from the river) is the Mt. Bonnell fault, the local major fault of the Balcones fault system, and the abrupt boundary between the American South and the American West.
		Thus, high ground west of the Mt. Bonnell fault is due partly to fault motion, and partly to resistance to erosion of the exposed strata.
		Fault movement is estimated to have ceased about 13 million years, but that time is not well-established, and the river terrace deposits constrain the fault history.
	www.geo.utexas.edu /courses/401/Labs_Exercises/Spring_04/Lab10FieldTrip.htm (1141 words)

	Texas Monthly: Read Me. Texas
		It is the Balcones that creates the Hill Country, that sets the stage for the Edwards Plateau and the High Plains beyond.
		It was during the Miocene era, between 5 and 20 million years ago, that the fault zone in the buried Ouachitas created the Balcones Escarpment.
		The escarpment served as a trap for the weather masses that moved in from the Gulf, and as a result the rainfall along the fault zone was intense, eroding the soil along the new stream channels and declivities it carved in the bedrock.
	www.texasmonthly.com /ranch/readme/balcones.php (764 words)

	Southwest Research Institute (SwRI) 2007 News Release
		This fault is a fracture zone along which the Glen Rose Formation strata were displaced, or slipped nearly 250 feet downward, toward the Gulf of Mexico.
		Although the fault was known and had been studied in the 1960s when Canyon Dam was built, no one has had a clear view of it until after the flood of 2002.
		In future years, the project is expected to use geomechanical analysis and modeling to hone the oil industry's ability to predict rock deformation in reservoirs before drilling, and the permeability characteristics of fault zones and surrounding rock to improve fault representations in reservoir models.
	www.swri.org /9what/releases/2007/flocar.htm (499 words)

	Kincaid Shelter
		The fault line marks an abrupt transition from the elevated limestone hills and canyonlands to the low, flat Gulf Coastal Plain.
		The shelter is located in the Balcones Fault zone near the northern edge of the Rio Grande Plain.
		During periods of normal flow, the water disappears underground at the Balcones Fault zone not far upstream from Kincaid Shelter.
	www.texasbeyondhistory.net /kincaid/env.html (1514 words)

	SOS Alliance: Protecting Barton Springs, the Edwards Aquifer, and its Hill Country watershed. (Site not responding. Last check: )
		The Balcones Escarpment is the topographic expression the Balcones Fault, the most pronounced of the faults caused by the great weight of sediments being carried onto the limestone plateau.
		In general, the movement of groundwater in the freshwater part of the Aquifer is from areas of higher elevation in the southwest toward major discharge areas in the northeast.
		The flow pattern is controlled primarily by the locations of barrier faults that disrupt the continuity of the permeable Edwards strata.
	www.sosalliance.org //geology.shtml (1475 words)

	HORST BLOCKS AND REGIONAL ANTITHETIC FAULTS WITHIN THE BALCONES FAULT ZONE, SOUTH-CENTRAL TEXAS
		The Balcones fault zone is a set of mainly Neogene normal faults that are observed displacing Cretaceous strata at the surface.
		Late Paleozoic graben faulting may have been reactivated and be responsible for the anomalous fault patterns.
		The block-bounding faults confine flowpaths in the aquifer, and may be partly responsible for the anomalous downdip edge of fresh water in Uvalde County.
	gsa.confex.com /gsa/2005SC/finalprogram/abstract_83950.htm (506 words)

	lab exercises (Site not responding. Last check: )
		The Balcones Escarpment separates the uplifted region to the northwest of the Balcones Fault Zone from the subsided region to the southeast (Fig.
		Some of the relief of this region is due to uplift along the Balcones Fault Zone, some is due to the resistance of the limestones to erosion (Fig.
		Numerous faults parallel the coast, formed partly by rifting as North and South America separated after the Ouachita Orogeny, partly by Tertiary sediment loading (Fig.
	courses.unt.edu /hwilliams/GEOG_3350/lab_exercises.htm (907 words)

	Austin Chinatown :: News
		Sharply dividing these two distinct topographic terraines is the Balcones fault which forms a northeast-southwest line through the western half of Austin, creating the Balcones escarpment.
		The escarpment has been the location for colonization and towns throughout Texas history because of the natural resources associated with the fault-plenty of natural building stone ourcrops on the escarpment, water pors from springs, timber can be gotten on teh wooded hills, and the adjacent fertile prairies support a strong agricultural economy.
		Glen Rose limestone, elevated west of the Mt. Bonnell fault is the bedrock aroud Mt. Bonnell.
	sanfrancisco.2002china.net /chinatowns/austin/naturehomee.shtml (1211 words)

	Friends of Bright Leaf
		Overall Bright Leaf is a relatively homogeneous Ashe Juniper/Oak woodland at the eastern edge of the Edwards Plateau, a deeply eroded platform of Cretaceous limestone that stretches west as far as the Pecos River and forms the Texas Hill Country.
		Movement along the faults has raised the rocks to the west and lowered the rocks to the east, for a net difference in elevation of over 1,000 feet.
		The Balcones Canyonlands is a highly dissected area consisting of steep canyons, narrow divides, and high gradients.
	www.brightleaf.org /abl-g.html (1279 words)

	Hills
		Friedrich Wilderness Park lies on the Balcones Escarpment at the edge of the Balcones fault zone that separates the Edwards Plateau from the South Texas Plains.
		Although the fault is now quiet, it lies in an area of ancient and repeated geological activity.
		The fracture along which this last uplift occurred is the Balcones fault zone.
	www.fofriedrichpark.org /hills.shtml (0 words)

	Edwards Plateau, Physiographic Area 53 - Executive Summary
		This hilly area is clearly demarcated by the Balcones Fault escarpment to the east and south, but grades into the Chihuahuan Desert to the west and the Great Plains to the north.
		The central and western portions of the plateau are characterized by broad, relatively level uplands moderately dissected by gently sloping stream divides.
		The deeply dissected portion adjacent to the escarpment, the Balcones Canyonlands, is popularly known as the Texas Hill Country.
	www.blm.gov /wildlife/pl_53sum.htm (363 words)

	UTSA HydroGIS - Dr. Alan Dutton (Site not responding. Last check: )
		During this research career I have studied the physical and chemical hydrogeology of several Texas aquifers and have been closely involved in developing groundwater models for the Ogallala (High Plains) aquifer, Carrizo-Wilcox aquifer, Edwards (Balcones Fault Zone) aquifer, Gulf Coast aquifer; North Texas Trinity-Woodbine aquifers, and for alluvial aquifers.
		The Edwards (Balcones Fault Zone) aquifer is a maturely studied karst aquifer with abundant hydrogeologic data.
		Detailed information on its karst heterogeneities remains scant, of course, in comparison to their importance for water transport.
	www.utsa.edu /hydroGIS/Alan_Dutton.htm (500 words)

	Balcones Fault League - (Holland, TX) - powered by LeagueLineup.com
		Balcones Fault League - (Holland, TX) - powered by LeagueLineup.com
		The high school field is located behind the Academy Middle School on Highway 95 just north of the traffic light and on the east side of highway 95 in Academy, Texas.
		There will be no games and/or practices in any Balcones Fault town/league from April 16, 2007 until the afternoon of April 17, 2007 due to TAKS testing.
	www.leaguelineup.com /balconesfaultleague (0 words)

	GCBC90 - A Traditional Cache in Texas, United States called It's Balcones Fault... Too created by Blizzard
		This is the original cache type consisting, at a bare minimum, a container and a log book.
		Please note: To use the services of geocaching.com, you must agree to the terms and conditions in our disclaimer.
		The renewed/restocked 'It’s Balcones Fault' cache is back from the dead as 'It's Balcones Fault Too.' Don't be fooled by an inviting URP.
	www.geocaching.com /seek/cache_details.aspx?wp=GCBC90 (380 words)

	San Antonio Natural Areas - Balcones Fault
		As the softer layers erode, a stair-step topography like balconies (hence Balcones Escarpment) is produced.
		As the softer layers erode quickly and the harder layers, more slowly, a stair-step topography like balconies (hence Balcones Escarpment) is produced.
		Over long periods of time as further erosion and soil formation continue, pockets of deeper soil tend to form on the steps of the balconies.
	www.sanaturalareas.org /balcones.html (239 words)

	Escarpment information - Search.com
		A strike-slip fault may bring a piece of high ground adjacent to an area of lower ground.
		The latter is common in California along the San Andreas fault and the many other strike-slip faults in the area.
		In England escarpments are found in a diagonal line across the country from the Yorkshire coast on the North Sea to the Hampshire coast on the English Channel.
	domainhelp.search.com /reference/Escarpment (423 words)

	Pinternet.net: Beer - (Great Grains) Balcones Fault Red Granite (Site not responding. Last check: )
		Balcones Fault Red Granite is an English-style brown ale.
		Balcones Fault Red Granite has a malty nose and nutty flavor.
		The Balcones Fault line of beers was originally started by Hill Country Brewing and Bottling in Austin, Texas.
	members.tripod.com /pinternet/en/bier/bieren/greatgrains/balconesfaultredgranite.html (61 words)

	IS TEXAS' "BALCONES FAULT" ACTING UP ???
		I live [Jan 23] right beside what is called the "Balcones Fault" in Texas.
		The roads over the Balcones Fault continue to swell, sink, twist, dip and drop again and again and again.
		Me, myself, I think the whole "Balcones Escarpment of Texas" is slowly sinking into the Gulf of Mexico.
	www.rumormillnews.com /cgi-bin/archive.cgi?noframes;read=63868 (351 words)

	Texas Hill Country at AllExperts
		The region is the eastern portion of the Edwards Plateau bounded by the Balcones Fault on the east and the Llano Uplift to the west and north.
		The terrain is punctuated by a large number of limestone rocks and boulders and a thin layer of topsoil which makes the region prone to flash flooding.
		Several cities, including Austin, San Marcos and New Braunfels were sited in the flat areas immediately to east of the Balcones Fault line where rivers flow across it, because of the limits of river navigation.
	en.allexperts.com /e/t/te/texas_hill_country.htm (353 words)

	Balcones Fault - OLE HIPPIES with ATTITUDE - Care2.com
		Women interested in receiving an exam are required to call 800/294-4923 as soon as possible for pre-exam screening to confirm qualifying criteria...
		Armadillo World Headquarters regulars Balcones Fault have decided, for only the second time since breaking up in 1978, to reassemble for a reunion at the Armadillo Christmas Bazaar on Saturday, Dec. 21 at the Austin Music Hall.
		Co-founder Jack Jacobs says, "We will put on a good show, 'cause we're assuming it'll be the last one." The Armadillo Bazaar, by the by, starts next week, Dec. 12, and runs through Dec. 24.
	www.care2.com /c2c/groups/disc.html?gpp=3485&pst=511499&archival=1 (746 words)

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