Tectonic Setting North Alaska is part of a continental fragment called the Arctic Alaska microplate. Upon this microplate, the North Slope and its continental shelves reside. During the Paleozoic and early Mesozoic time periods this plate was a passive continental margin. Later on during the Jurassic and Cretaceous time periods, rifting along this margin separated the plates. The Canada basin and Beaufort passive margin were created due to drift and rotation. At the same time the Arctic Alaska plate collided with an oceanic island ac which then created the Brooks Range orogeny and the North Slope foreland basin. The Southern portion of the North Slope basin is a fold and thrust belt which contains extended anticlinal folds diminish toward the …show more content…
A compressive tectonic activity of the orogenic belt carried on in the eastern portion of the basin into the late Tertiary and the northern structural margin of the basin was part of a rifted margin of an oceanic basin. Through seismic sequence analysis the normal faulting in this area is believed to be active from the middle Jurassic to the early cretaceous. The North Slope developed on a south facing continental margin which was Paleozoic to Mesozoic in age. Both the rifting in the north and the compression in the south margin make the North Slope foreland basin. The evolution of the basin is known from the fragments that were preserved in the Brooks Range orogene and archives many kilometers of crustal shortening in the early stage. Later on during the Aptian to the Holocene on records a miniscule amount of crustal shortening that were created by an adjacent orogeny during earlier basin development. There are shifting sites of deformation are thought to be produced by northeastward filling of the basin. The basin as we see it today is thought to have begun to form in the Aptian time. There was major subsidence which is a change in deformation had depressed the south facing shelf. The eastern end of the basin subsided during the Tertiary time more than likely due
Marshak, S. (2009) Essentials of Geology, 3rd ed. New York: W.W. Norton & Company, ch. 11, p. 298-320.
Lithologically the Kimmeridge Clay Formation can be subdivided into four units (Figure 2), despite of beds at the base of the succession are poorly exposed. However, in contrast, the units from mid-eudoxus Zone to the top of the formation that are well seen in the Formation. At the base of the formation until the eudoxus Zone, the strata are made up almost entirely of bioturbated shelly clays and in between beds, horizons of oil and bituminous are present. The upper part of the Eudoxus Zone until the upper Pectinatus Zone the composition is kerogen-rich mudstones and coccolith limestone.
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.
The third alluvial deposition consists of sand, silt and minor inter-bedded gravel, and again indicates Brimbank Park’s changing geology over time. (Geological map of Victoria, 1973). These deposits, as well as a nearby fault suggest volcanic activity 5-1.6 million years ago, which explains the olivine basalt (fig. 2) deposits which date back to to the Silurian and Tertiary period.
Periods that the folding occurred in which formed the outlines of the basin as it
The St.Lawerence Lowlands region consists of two parts St.Lawerence Lowlands and great lakes. The parts are separated by a thin wedge of the Canadian Shield, this thin wedge is just across the St.Lawerence river and extends to the United States near Kingston Ontario. These Lowlands have bedrock formed of sedimentary rock, the bedrock can be seen in several escarpments in the Great Lakes Lowlands. The best known is the Niagara escarpment which extends from Niagara to Manitoulin Island, the Great Lakes landscape is characterized by flat plains with glacial hills and deep rivers and valleys. The Lowlands was formed by faulting which caused a rift valley, the valley was flooded with water close to the end of the last ice age by part of the Atlantic
Looking for Alaska starts off with Miles Halter leaving his home town in Florida in search for the Great Perhaps (the last words of Francois Rabelais) at Culver Creek Preparatory High School in Alabama; the same boarding school his father had attended when he was younger. At the beginning of the book Miles is seen as a bit of an outcast with little friends and a weird habit of memorizing people’s last words.
The Palisades basalt sill is one of the most active mass movement areas in New Jersey (Pallis, 2009) and because of its activity it is important to understand the underlying mechanisms that cause the rockfalls along the outcrop. The Palisades are composed ancient Jurassic flood basalt that formed through at least three distinct intrusion events (Puffer, 2009). It is important to understand that in all of these events the molten magma was allowed to completely cool before the next event allowing for the formation of the iconic hexagonal columns of basalt (Puffer, 2009). These columns are referred to columnar joints and formed when the molten basalt cooled within the earth's crust. The cooling of the basalt caused it to shrink, creating vertical fractures along the weakest planes of the newly formed rock (Puffer, 2009). These joints are called primary joints due to these columnar joints forming as the rock itself formed (Linsey, 2014).
Looking for Alaska is a novel written by John Green. The novel was written in 2005 and since then has won many awards such as the Michael L. Printz Award for Excellence in Young Adult Literature. This novel is found relatable by many teenagers and it also contains many literary symbols. Some of those symbols include: the lake, last words, and white flowers. One of the various symbols that occurred regularly was the smoking hole.
Sequence boundaries are the beginning and the end of a depositional sequence, and are formed by erosional unconformities. This happens when the shoreline migrates seaward during a regression. The drop in sea level leads to erosion on the shelf from waves, the exposing of sediments to the air allows them to erode as well. These occur at the beginning and end of every cratonic sequence (Sauk, Tippecanoe, Kaskaskia, Absaroka, Zuni, and Tejas). Catuneanu (2002) described sequence boundaries as “diachronous, capping the previous highstand systems tract and eroding the surface of the down-stepping sediments deposited during accompanying forced regression associated with sea level
Have you ever felt like you don 't know what your purpose is in life? Like you’re stuck in this world surrounded by people, standing out, but never truly noticed, feeling like the one thing you screwed up has pulled you down with a chain for the rest of your continuing life? In the book, Looking For Alaska, Miles Halter is looking for his place in life. Such as, where he belongs, and what his purpose is. He made a decision to move to a new school, Culver Creek, to start a new year. He quotes “ ...‘I go to seek a Great Perhaps.’ That 's why I’m going. So I don 't have to wait until I die to start seeking the Great Perhaps.” (p5). His idea of a “Great Perhaps” is something better than what he has, a meaning in life, and friendship. But what he
While all of the continents were formed by the splitting of the supercontinent Pangaea, Iceland emerged because of a divergent, spreading, boundary between two plates known as the Eurasian and North American tectonic plates (Fig. 1). As these plates move away from each other, Iceland is torn down at its center, which causes both sections to move apart. Because of these moving plates, magma rises from the asthenosphere below, providing molten rock for the volcanoes and heat for the geysers that are located there.
Continental transform plate boundaries appear today in the circum-Pacific region (California, southern Alaska, New Zealand, and in the Alpine fold belt, e.g. Turkey, and the Dead Sea) (Windley, 1978). Transform faults that originate in continental plate boundaries manifest specific expressions in their morphology and topography over extended distances. These tectonic features are generally associated with complex systems of echelon fractures, folding, and faulting that originate in narrow-elongated zones. In transform fault systems, the deformations that characterize them are mostly oblique divergence or convergence, hardly resulting in evenly distributed shear zones. The resulting ...
The Eskimo tribe is very different from the rest. All tribes have different attributes. The Eskimos attributes are very unique and interesting. It is important to learn about this tribe, because they helped America with its cultures and much more. Who knows how different America would be if the Eskimo tribe did not exist along with many other tribes.
As described above, Quaternary glacial-, glaciofluvial- and alluvial deposits are absent but may occure in protected relief positions. Primary soil-forming materials are the omnipresent Triassic trappean rocks. After Sokolov et al. (2002) soils in this province mainly develop from residuum of bedrocks or from their loose derivatives of colluvial and solifluctional origin. In general mineral and chemical composition of the “sediment mantles” resemble underlying bedrock (Sokolov et al., 2002).