The Arrastre Wash is a region which contains interesting geologic structures, and it is located on the west side of the city of Tucson in the Tucson Mountain Park. This region is predominantly composed by sedimentary rocks from the lower Cretaceous such as sandstone and shale, which can be distinguished by the grain size, and the conglomerates from the Quaternary. The rocks from the lower Cretaceous were deposited on an alluvial environment in which the energy of transport sediments varied. The outcrops were twisted, folded and uplifted Fold Geometry The region is characterized by a system of anticlines and synclines, which from the stereographic fold analysis, it was possible to notice that they are asymmetrical, steeply inclined with non constant interlimb angles. In addition, the layers appear to have uniform thickness, so if this assumption is correct, the folds on the Arrastre Wash are concentric. The five folds identified in the Arrastre Wash have trend either to the Northwest or Southeast. For example, Fold 1 has a trend of 318, but the Fold 2 has a trend of 135. The folds in the Arrastre Wash have plunges in the range of 1 to approximately 20, which in the classification of the plunge …show more content…
The sediments on the Arrastre wash were deposited in the alluvial environment, in other words, by a river that passed through the region during the Cretaceous. Moreover, they were initially horizontal, but stresses, which could be caused by the increase in pressure and temperature or even the movement of the tectonic plates, forced the layers to fold. In addition to the folds, it was possible to observe the ripple marks on the floor of the Ripple Wash, which gives the direction in which the river was flowing, and joints on certain
The Kimmeridge Clay Formation is the penultimate formation of the onshore British Jurrasic Succession. William Smith was the first to document this distinct formation on his map of 1815, and to name as the Oaktree Soil. In 1817, he gave the name Oaktree Clay for the layers of clay between the “Portland Rock” and “Coral Rag and Pisolite” but in 1816 Webster was the first to describe in details the formation and changed to the name now known as kimmeridge Clay Formation after the English village of Kimmeridge on Dorset’s “Jurassic Coast” a place frequently visited by fossil hunters. (Cox and Gallois, 1981).
Yes this feature is the result of erosion and depositional processes however, it is not associated with the current water course. This feature may be the result of a Gilbert type delta that once occupied this area. Gilbert type deltas have three main components; topsets, foresets and bottomsets. Topsets are fluvial sediments (primarily sandur deposits) that were deposited on the subaerial delta surface. Erosive events occurring on the upper forslope can result in downslope channels and chutes. These features are then eroded by either strong currents or by debris flow resulting in these channels and chutes to become filled. Foresets are a combination of sand and gravel facies. The are deposited by gravitational processes on the delta foreslope and the grains tend to become finer and more angular downslope. Bottomsets consist of fine grained silts and clay and are deposited at the foot of the delta front.
[ 9.1 ] Based on your hypothesis, if you cleared an area in the center of the rock face, do you predict that Semibalanus will settle in the new open space (i.e., will any land and attach to the rock in that space)? Why or why not?
This shows that it is eroded at one end more which is a sign of long
Sedimentary rock from the older Silurian Period is further from the river banks (Geological map of Victoria, 1973). Mudstone, inter-bedded shale and greywacke depositions indicate the Maribyrnong River may have previously taken a different shape, and younger sediments have replaced the older sediments in more recent geological periods.
Bonnett, Gabrysch R.K. and C.W. "Land Surface Subsidence at Seabrook, TX ." US Geological Survey. Seabrook TX: Water Resources INV, 1975.
More specifically, Trois-Rivieres is located in an area with flat and rolling hills, and fertile soils that play a huge part of Trois-Rivieres’s economy. The formation of the Great Lakes-St Lawrence Lowlands happened during the Paleozoic era. “The Great Lakes-St Lowlands were formed by the effects of glaciation. This is caused the city’s rolling landscape where flat plains are interrupted with glacial hills and deep river valleys. After the glacial period, when a large volume of water melted out from the glaciers, the lakes were large, even larger than they are today. However, the lakes shrank to their present size, and flat plains of sediments remained. These sediments formed excellent soil for farming” (Pandya, n.d). This process left behind a large amount of sediment rock, which was beneficial for the manufacturing industry.
Source 4. A map of the Earth’s fault lines and plates with the direction of their movement.
... the Dry Wash also joins the Puerco River, but on the contrary, the Dry Wash joins the river from the left side of it. Unlike any of these washes, the Digger Wash doesn’t converge with the Puerco River.
The Grand Canyon is one of the most amazing natural wonders in the world. It was originally deposited sediment that was lithofied, and turned into sedimentary rock. The rock was then carved out by hydraulic processes (Warneke). These processes, all combined, took almost three to six million years to form the Grand Canyon. Continued erosion by wind and rain in the present time continues to shift what the canyon looks like, and make it different as time goes on ("Grand Canyon Facts").
Green washing: The disinformation disseminated by an organization so as to present an environmentally responsible public image. In order for big companies to stay on top of the market today, they are forced to think of advertising strategies to help their public image and advertise their product. Over the years the system has become very complex and also very questionable. Companies are willing to lie, change their logo, and sometimes even their company name just to keep their name and image clean in front of the public just to make sure that they are making their money. Green washing helps this by advertising to the public that they are environmentally supportive and responsible. Most people that are into buying “green products” do not even realize that the company they are buying from is green washing in some sort of way just so that they can attract attention to the public. Green washing companies may advertise that they are “eco-friendly”, but when it comes down to it, the facts hidden behind the curtains beg to differ. Just like in the green washing video we watched in class, the companies may look great compared to the worst companies, but that does not mean what they are doing is still productive for our environmental movement. One company that has been notorious for their green washing efforts for the past couple of decades is the Oil/energy company: British Petroleum a.k.a. Beyond Petroleum. They are one of the world’s largest leading oil companies who has also becoming a large energy supplying company with presence in petrochemicals, gas, and solar divisions. Over the past twenty years BP has been the cause of several deadly disasters in the oil business in the U.S. and around the world. Despite their green washing effor...
The Mid- Atlantic Oceanic Ridge is the best known divergent boundaries. Divergent boundaries are when two plates move apart from one another. The Mid-Atlantic Oceanic Ridge is spreading at an average of 2.5 centimeters a year ("Understanding plate motions [This Dynamic Earth, USGS]", 2014). This underwater mountain range a prime example of seafloor spreading as well. Seafloor spreading creates new oceanic lithosphere when the two plates pull apart and magma is allowed to well up and fill the crack. This also causes underwater mountains to form if the magma flows upwards past the crust (Tarbuck & Lutgens, 2015). It is important to understand how these ranges are created, especially because they can give scientists an idea on when new islands or continents may be formed. It also allows scientists to understand what may cause other plates to diverge from one
Riley, C.M. "Lahars." Geological and Mining Engineering Sciences. Michigan Tech. Web. 6 Feb. 2010. .
Stephen .G,Malcolm.W, Guy H,(2014), GEOL20001 The Geology of Southeast Australia, School of Earth Sciences, University of Melbourne, pg. 23-25
Diastrophism is deformation of earth’s crust, caused by folding and faulting. Convergent plate boundaries are formed through diastrophism. A convergent boundary (or a destructive plate boundary) is formed when two or more tectonic, lithospheric plates collide. There are two types of plates: oceanic (more dense) and continental (less dense). If two oceanic plates collide, subduction will occur. Subduction refers to the movement of one plate, sliding underneath another plate. The plate that is pushed down is consumed by the magma in the internal structure of the earth. When this happens, there will be a large, deep underwater trench where the subduction occurred (Mariana’s trench is an example of this). The plate that is consumed by magma causes