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Lecture Notes for GEOS 1014 - The Earth & Life Through Time with Xiao at Virginia Tech (VT)

Notes Information

Material Type:Review Sheet 1
Professor:Xiao
Class:GEOS 1014 - The Earth & Life Through Time
Subject:Geosciences
University:Virginia Polytechnic Institute And State University
Term:Fall 2006
Keywords:
  • Uniformitarianism
  • Unconformity
  • Catastrophism
  • Age of the Earth
  • Age of Earth
  • Provided That
  • Index Fossils
  • Geothermal Gradient
  • Tetrahedron
  • Chemical Change
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Sample Document Text

Review Sheet: Part 1 Geological Time Scale: 1) all eons and eras, 2) Phanerozoic periods, 3) Cenozoic epochs, and 4) the age boundaries between Proterozoic and Phanerozoic, between Paleozoic and Mesozoic, and between Mesozoic and Cenozoic. Uniformitarianism - The past history of our globe must be explained by what can be seen to be happening now”, -- uniformitarianism “The present is the key to the past” (Sir Archibald Geike catastrophism - Dramatic changes in successive fossil assemblages Neptunism - Primary rocks: no fossil, crystalline, deposited before the biblical flood Secondary rocks: fossiliferous, consolidated, deposited during the biblical flood Tertiary rocks: fossiliferous, unconsolidated, deposited after the biblical flood Plutonism Mechanical force of tilting and uplifting comes from magmatic activities Most rocks are igneous or related to magmatic and volcanic activities Steno’s three principles Horizontality lateral continuity superposition - important for relative dating. Cross-cutti...

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