please help me to understand for my study guide. thank you be x, x\' A-Y-A- ? +,
ID: 292938 • Letter: P
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please help me to understand for my study guide. thank you
be x, x' A-Y-A- ? +, o, . M . 1 Normal! No Spac Heading 1 Heading 2 Title Sub Font Paragraph important Orogenies and Other Events e Describe the timing, cause and location of the following events: o The Acadian Orogeny o The Alleghenian Orogeny o The Western Interior Seaway o The Rifting of Pangea . Describe examples of evidence for each of the above events including: o Faulting o Folding o Specific sedimentary clues to depositional environment (e.g Arkosic Conglomerate in the Fountain Formation, CO and Greywacke in the Ordovician Rocks of Virginia) rchExplanation / Answer
The Acadian orogeny began in middle Devonian roughly 375 million years ago and continued for about 50million years. It involved the collision of a series of avalonian fragments with laurisian continent. It is responsible for formation of Appalachian mountains. Plutonic and metamorphic events also occured.
Alleghenian orogeny occured in carboniferous to permian from 325-260 million years ago. It led to Appalachian orogeny. It was caused by afrAfr colliding with North America. The sedimentary formations include shales, sandstones and conglomerates depicting large sedimentary basin where sediments from distant continents deposited. Greywacke sequence is also present.
The western union seaway was a large inland sea during cretaceous uptown paleocurrent. It divided North America into two landmasses laramidia and Appalachia. It was created as the Fallon plate subducted under North American plate. Large scale carbonaceous deposit suggest that the basin was in a tropical warm climate with calcareous algae.
Pangaea was a supercontinent during paleozoic and early mesozoic. It began to break apart about 175million years ago. There are 3 major and several minor phases of break up of Pangaea. Almost all types of sedimentary rocks are found in Pangaea lands. Many orogenies are also associated with the break up of Pangaea.
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