Geological History of the Llano Uplift - Joshua Narabal...

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Joshua Narabal 12046381Geological History of the Llano UpliftIn this paper, I will be summarizing the geological events in the llano upliftarea. The evidence I will be using for this paper are my own observationsthat I was able to take on my trip for my field methods spring 2015 class toperdenales Falls area. The geological features here will range from thePrecambrian to the lower cretaceous. I will begin with the initial deposition ofthe packsaddle schist and end with the deposition of the sycamoreconglomerate.We begin with the Precambiran what I assume to be siltstone,sandstone or some kind of sedimentary rock that experience low grademetamorphism that create what we now know as the Packsaddle Schist. ThePacksaddle Schist reaches a thickness of about 22,400ft, furthermore theserocks are some of the oldest rocks in the llano region, about 1.2 billion years.After rocks were deposited, an orogeny occurred that deformed these rocksand caused a regional metamorphism, which occurs in a large area causinglow grade metamorphic rocks such as the packsaddle schist. Then about 1.1billion years ago, town mountain granite intrudes the metamorphosingpacksaddle schist and we see synkinematic granite that was seen in stop 2which indicated by granitic veins and bouduan calcite, then also a postkinematic granite which were granitic dykes that were cross cutting the

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Term
Fall
Professor
RAPPENGLüCK
Tags
Geology, packsaddle schist, Joshua Narabal

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