BigBend Report - 1 1Big Bend Field Project Report...

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Big Bend Field Project ReportSebastian Weinand, 1006904Field Methods, Robinson, Lab 10-1130IntroductionDagger Mountain in Big Bend National Park, Texas consists of cretaceous sedimentaryrocks and few igneous intrusions.This study is to map out contacts of the different Rockformations that make up Dagger Mountain such as, Boquillas, Buda, Del Rio, and Santa Elena.It is also to study the different structures of the area and how they affect the geology and layoutof the rock formations.Faults, folds, intrusions and contacts were mapped.Tectonic SettingGeographic SettingDagger Mountain consists of rock formations formed during the Cretaceous periodanywhere from 66MA to 146MA years ago.The mapping region has features such as faults,folds, erosion and weathering, and intrusions.The faults are along the valley edge and consist oftwo normal faults in which the younger rock formation has sunk and the older has risen.Thefolds are small scale and too small to be mapped but can be seen in the valley between faults inthe Boquillas rock formation.Erosion and weathering can be seen throughout Dagger Mountainand it creates some key features to help identify the rock formation, such as the elephant skin ofBuda and the sharp texture of Santa Elena.The intrusions are seen cross cutting through theBoquillas rock formation indicating a form of contact metamorphism.Figure 1 depicts thecontacts and area of the rock formations along Dagger Mountain. As well as the structures seenincluding the intrusion (red area) and the Faults (dashed line with balls and sticks).Figure 2 is a1123456789101112131415161718192021222
cross section the line A-B seen in Figure 1.Figure 2 depicts the curvature and layout of thelayers of the rock formations underneath the surface and how the faults affect them.Major Tectonic EpisodesThe major tectonic event that is believed to have caused most of the features alongDagger Mountain is the Laramide Orogeny.This is believed to have taken place in the lateCretaceous, early Cenozoic period (Cullen, 2013, 101).The Laramide Orogeny is responsiblefor the uplift of the Rocky Mountains and stretches down to Big Bend National Park, Texas(Conner, 2003, 10).

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Term
Fall
Professor
RAPPENGLüCK
Tags
Petrology, Orogeny, Dagger Mountain

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