Geology notes January 26th
Geology notes January 26th Geol 2150
Popular in Geologic History of Dinosaurs
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This 2 page Bundle was uploaded by Imani Notetaker on Thursday February 11, 2016. The Bundle belongs to Geol 2150 at Bowling Green State University taught by Dr. Peg Yacobucci in Winter 2016. Since its upload, it has received 29 views. For similar materials see Geologic History of Dinosaurs in Environmental Science at Bowling Green State University.
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Date Created: 02/11/16
geology 240 Ma (million years ago) Early Triassic 220 Ma Late Triassic all continents move to the north 200 Ma early Jurassic separation between north and south america 170 Ma Middle Jurassic opening ocean india pulls away from africa 150 Ma Late Jurassic 120 Ma early Cretaceous 105 Ma middle Cretaceous 90 Ma Late Cretaceous 65 Ma End Cretaceous How do we know what the position of the continents used to look like? Evidence fro Paleogeography • "Fit" of continents • Distribution of fossils and rocks • "Reversing" seafloor spreadings • Ancient Mountains (and sediments eroded from them) • Remnant magnetization of igneous rocks • 1. Geographic “fit” of the continents - Sir Francis Bacon 1620 “no mere accidental occurrence” • 2. Fossil and Rock distribution line up - looking for types of rocks, volcanic eruptions, ice sheets, and fossils that cannot travel far. Pangea - the most recent supercontinent (one big continent) not the only supercontinent pangea ( all earth ) Plate tectonics - surface of earth is broken into plates that move relative to one another. the plate is ocean plus tectonic. the ocean is changing By dating seafloor, can identify mediation ridges- where new seafloor is being created. new ocean floor forms down mid ocean ridges • 3. by “reversing the spreading, can reconstruct where continents once were. Continents don’t move through ocean - ocean basins grow, pushing continents apart. Ocean crust must be destroyed somewhere else - where pieces of crust come together. SUBDUCTION produces a trench and volcanoes as ocean plate sinks back into Earth. Ocean colliding with ocean or ocean colliding with continent. Continent - continent collision produces a large, broad interior mountain range with no volcanoes. • 4. Ancient mountains = evidence of old collision events / plate boundaries • orientation of earth’s magnetic field is a function of latitude. moving metal creates a magnetic field • 5. Remnant magnetization an igneous rock can record the magnetic field and therefore the latitude at which is cooled many different independent lines of evidence recorded in rocks and fossils.
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