Geology of the Sharp Mountain area, Llano County, Texas

dc.contributor.advisorNot available
dc.creatorMartínez-García, E. (Enrique), 1940-
dc.date.accessioned2024-05-26T21:38:14Z
dc.date.available2024-05-26T21:38:14Z
dc.date.issued1971
dc.description.abstractThe area immediately southeast of the town of Llano is underlain by metamorphic rocks, diorite, and several types of granite, all of Precambrian age. Marble is quarried for roofing and flooring chips, and a little graphite schist is worked to produce water filter granules. The Valley Spring Gneiss is exposed on the flanks of the recumbent Llano syncline and in the core of an associated small anticline. The folds plunge gently to the southeast and their limbs dip to the southwest. Overlying the Valley Spring Gneiss are the varied schists and marble layers of the Packsaddle Formation. Foliation in the metamorphic rocks is generally parallel to bedding (compositional layering), and the most prominent lineation is parallel to fold axes. Regional metamorphism attained the almandine amphibolite facies. During the orogenic episode in which the rocks were folded and metamorphosed they were intruded by diorite (Watson Diorite) which underwent considerable metamorphism and later by a series of granites (Town Mountain Granite, Oatman Creek Granite, and Crownover Granite) which are relatively unmetamorphosed. Watson Diorite and Crownover Granite are new informal names proposed here for local use in this area
dc.description.departmentEarth and Planetary Sciences
dc.format.mediumelectronicen
dc.identifier.urihttps://hdl.handle.net/2152/125412
dc.identifier.urihttps://doi.org/10.26153/tsw/51978
dc.language.isoen
dc.relation.ispartofUT Electronic Theses and Dissertationsen
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en
dc.rights.restrictionOpen
dc.subjectTexas geology
dc.subjectLlano County Texas geology
dc.subjectLlano County geology
dc.subjectPrecambrian stratigraphic geology
dc.subjectSharp Mountain Texas geology
dc.subjectValley Spring Gneiss
dc.subjectPacksaddle Formation
dc.subjectWatson Diorite
dc.subjectTown Mountain Granite
dc.subjectOatman Creek Granite
dc.subjectCrownover Granite
dc.subject.lcshGeology--Texas--Llano County
dc.subject.lcshGeology, Stratigraphic--Precambrian
dc.titleGeology of the Sharp Mountain area, Llano County, Texas
dc.typeThesis
dc.type.genreThesisen
thesis.degree.departmentEarth and Planetary Sciences
thesis.degree.disciplineGeological Sciences
thesis.degree.grantorUniversity of Texas at Austinen
thesis.degree.levelMasters
thesis.degree.nameMaster of Arts

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