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vert notes - Vertebrate Evolution (Test Thursday September...

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Vertebrate Evolution (Test Thursday September 30, 2010) Age of the earth speculated to be 4.6 bilion years Oldest rocks have been dated back to about 3.85 billion years o So the earth itself is pretty old Sir francis bacon o Man noted as being a great philosopher o Very strong academician o Scholarly individual o About 1620 when he made the comments that were related to flat maps of the earth and how similarly the shorelines of western Europe and eastern north American match up to one another Under the ocean matches better Alfred Wegener o 1915 made a strong case for continental drift o German meteorlogist by trade o Adventurer o Attracted to Greenland Went on many expeditions to Greenland and died there in 1931 on a rescue mission o Came about because he climatological as well as geological data to formulate his idea o His concept of continental drift was denied Naive o Frank taylor Published a similar concept about continental drift in about 1910 o Continents moved along the surface of the earth plowed their way across the ocean floor mid-atlantic ridge
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o sonar became an essential tool for people studying the land beneath the sea world war II used to map the ocean bottoms thought for a long time that the ocean was a vast, flat abysmal plain o MAR extends for about 40000 miles o Mid atlantic Rift Between the mid-atlantic ridge Great vacuum Very deep valley 20 miles wide, 6500 feet down to the bottom seismologists o constantly monitoring areas prone to earthquakes and geologic instability o many earthquakes generated at the mid-atlantic ridge occur along the edge of continental land and island chains ie japan causes large tidal waves/tsunamis o we know that the geologic activity is caused by tectonic plates banging into each other Sea-floor spreading o Well-established by 1962 o Work that lead to the conceptualization of SFS came from the research of a man named Harry Hess Commander in the navy during WWII Assault transport vessel Professor of geology at Princeton University
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His work culminated in the theory of SFS in the 1960’s Was actually conducting research while commanding the navy vessel in WWII From one battle to another, he was echo sounding the bottom of the pacific Developing a mapping technique for the bottom of the pacific His ocean floor data was published in 1962 in History of Ocean Basins One of the more important contributions in the development of plate tectonics Outlined SFS works o Molten magma wells up from deep within the earth below fissures o When magma gets to the surface, the magma cools down and solidify o As material wells up, and begins to cool, it’s creating more sea floor o Pushing outward as more and more comes to the surface and pushes the continents apart o Eventually oceanic crust will descend into the trenches (subduction zone) and be recycled into the mantle
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This note was uploaded on 09/19/2011 for the course 1 101 taught by Professor Larrydavid during the Spring '11 term at South Carolina.

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vert notes - Vertebrate Evolution (Test Thursday September...

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