Rogers, John J. W.2016-04-222016-04-221962Billings, Gale K. "A geochemical investigation of the Valley Spring gneiss and Packsaddle schist, Llano Uplift, Texas." (1962) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/89927">https://hdl.handle.net/1911/89927</a>.https://hdl.handle.net/1911/89927Samples of the Valley Spring gneiss and Packsaddle schist were taken along two profiles in northern and south-eastern Llano County, Texas. These samples were analyzed for the major oxides, thorium, and uranium. A comparison of the Valley Spring gneiss and Packsaddle schist analyses with analyses of other rock types indicated:. 1) the parent rock of the Valley Spring gneiss could have been granitic or arkosic material: 2) banded amphibolites of the Packsaddle schist were originally mafic tuffs mixed with calcareous sediments; and 3) the parent rocks of the non-banded amphibolites of the Packsaddle schist were iron-rich basaltic material, probably tholeiitic.44 ppengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.ThesisRICE0962reformatted digitalThesis Geol. 1962 Billings