Geologic map of the Fall Prong Quadrangle, Kimble, Gillespie and Mason Counties, Texas,-99.25,30.5,30.375
dc.coverage.spatialFall Prong Quadrangle
dc.coverage.spatialGillespie County, Texas
dc.coverage.spatialKimble County, Texas
dc.coverage.spatialMason County, Texas
dc.creatorBarnes, Virgil E. (Virgil Everett), 1903-1998
dc.descriptionTo obtain a print version of this publication visit: and search for: GQ0019. 1 fold-out plate with text and map : Geologic Map of the Fall Prong Quadrangle, Kimble, Gillespie, and Mason Counties, Texas, 1956
dc.description.abstractFall Prong quadrangle is in the marginal portion of the Edwards Plateau near the southeastern corner of the Llano region. Almost three-quarters of the quadrangle is within the Edwards Plateau, and the rest consists of valleys of the Llano basin cutting back into the plateau. The geology of the Fall Prong quadrangle is shown on a planimetric map; the only topographic map available is the reconnaissance 30-minute Kerrville quadrangle. Elevations ranging between 1,723 and 2,245 feet were determined during traversing for control, but the lowest elevation was not reached. However, it is estimated that the relief within the quadrangle is about 545 feet, ranging between about 1,700 and 2,245 feet. The quadrangle is entirely within the Llano River drainage basin. Most of it drains into the James River via Little Devils River, with important branches being Fall Prong and White Oak Creek. Salt Branch in the northwestern corner flows directly to James River. A small area in the southeastern part of the quadrangle drains into Threadgill Creek and reaches the Llano River via Beaver Creek. The Fall Prong quadrangle is well up on the southwestern side of the Llano uplift and is covered by Cretaceous rocks which crop out over the entire quadrangle except in the northwestern part where Cambrian and Ordovician rocks appear. One fault formed during the Ouachita orogeny (Barnes, 1948) is exposed. The Cretaceous rocks are essentially horizontal and may dip as much as 6 feet per mile southeastward in most of the quadrangle. Broader discussions of the stratigraphic, structural, economic, and geophysical problems of the region are in references cited below. This publication on the Fall Prong quadrangle is one of a series of similar publications, an index to which is shown on the opposite page. The reader is referred to the index map to locate other quadrangles mentioned in the present text.
dc.description.departmentUT Libraries
dc.description.departmentBureau of Economic Geology
dc.format.dimensions1 map : col. 44 x 38 cm.
dc.publisherUniversity of Texas at Austin. Bureau of Economic Geology
dc.relation.ispartofVirtual Landscapes of Texas
dc.relation.ispartofGeologic Quadrangle Maps
dc.relation.ispartofseriesGeologic quadrangle map (University of Texas. Bureau of Economic Geology), no. 19
dc.subjectGeology -- Texas -- Gillespie County -- Maps
dc.subjectGeology -- Texas -- Kimble County -- Maps
dc.subjectGeology -- Texas -- Mason County -- Maps
dc.titleGeologic map of the Fall Prong Quadrangle, Kimble, Gillespie and Mason Counties, Texas
dc.title.alternativeFall Prong quadrangle, Kimble, Gillespie and Mason Counties, Texas

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