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Lecture_17_History_of_Life

Lecture_17_History_of_Life - Midterm Exam 2 Last years exam...

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1 1 Midterm Exam 2 Last year’s exam is posted. Help is available from your TA or Lecture TA Nothing is allowed except pencil or pen Bring your GT ID Covers material up to and including today 2 History of Life The fossil record Dating the fossil record • Evolution – Darwin’s theory – Speciation – Evidence Origin of eucaryotes First multicellular animals (Ediacaran Fauna) Cambrian explosion Rise of land plants and animals Understand concepts, don’t memorize fossil names or pictures
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2 3 3.5 bya (or earlier) Bacteria - blue green algae. 2.0 bya- eukaryotic cells (nucleus, mitochondira) 600 mya- Ediacaran Fauna- soft bodied multi- cellular fauna. Any survivors?? 530 mya- Cambrian Explosion- 5 my long. All but one modern animal phyla appeared (bryozoa). 4 Depositional Environments Land: Lake sediments Glacial tills Sand Dunes Alluvial fans (feet of mountains) River (floodplain) deposits Transitional Deltas Lagoons Reefs Deep Sea Turbidites (undersea landslides) Pelagic (open ocean) sediments
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3 5 The Fossil Record • Hard Parts (skeletons, shells)—most common. • Soft parts – need anoxic environment, not preserved for long. • Chemical residues • Mineral replacement—petrification • Molds and Impressions (squashed) • Trace fossils (tracks and trails) 6 Dating the Rock Record Date solidification of igneous (formerly molten) rocks. Determine when sedimentary rocks were put down relative to igneous rocks. From similarities in fossils apply to sedimentary rocks far from location of igneous rocks.
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4 7 A. Sedimentary rock. B. Sedimentary rock. C, D, E. Sedimentary rocks. F, G. Sedimentary rocks. H, I. Sedimentary rocks. W. Extrusive igneous flow. Numerical date: 445 m.y. X. Intrusive igneous. Numerical date: 460 m.y. Y. Intrusive igneous . Numerical date: 350 m.y.
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