Pre-Cretaceous erosional surface of the Llano Uplift region, Central Texas

dc.contributor.advisorLong, Leon E., 1933-en
dc.contributor.advisorWilson, Clark R.en
dc.creatorSobehrad, Susan Jeen
dc.date.accessioned2012-02-24T14:57:01Zen
dc.date.available2012-02-24T14:57:01Zen
dc.date.issued2011-08en
dc.date.submittedAugust 2011en
dc.date.updated2012-02-24T14:57:16Zen
dc.descriptiontexten
dc.description.abstractHistorical research reveals a repeating pattern of uplift, erosion, and deposition in the region of the Llano Uplift, central Texas. This report examines the topography of the pre-Cretaceous landscape. The data consist of points, in three dimensions, that are located on the erosional surface, as determined by three methods. Category I data lie upon the contact between Cretaceous strata and underlying Paleozoic sediments or Precambrian basement; Category II data are defined in the subsurface from well logs; and Category III data are topographic high points where the Cretaceous has eroded away, but the underlying unit has not eroded (an exhumed surface). Digital mapping procedures were used to create triangulated irregular networks, three dimensional scenery, and topographic profiles. The digitally reconstructed surface is compound, consisting of higher, older erosional surfaces, incised into by rejuvenated stream activity to create lower, younger surfaces. This valley/divide topography, which is regional in extent, could not have been visualized without modern GIS technology.en
dc.description.departmentScience, Technology, Engineering, and Mathematics Educationen
dc.format.mimetypeapplication/pdfen
dc.identifier.slug2152/ETD-UT-2011-08-3915en
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2011-08-3915en
dc.language.isoengen
dc.subjectCretaceousen
dc.subjectLlano Upliften
dc.subjectGISen
dc.subjectPre-Cretaceousen
dc.subjectErosional surfaceen
dc.titlePre-Cretaceous erosional surface of the Llano Uplift region, Central Texasen
dc.type.genrethesisen
thesis.degree.departmentScience and Mathematics Educationen
thesis.degree.disciplineScience Educationen
thesis.degree.grantorUniversity of Texas at Austinen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Artsen

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