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Unformatted text preview: Unconformity- an erosion surface, former land surface Angular unconformity Disconformity Nonconformity Early attempt: not successful, no state of knowledge Youngest: Tertiary layer rocks , break easily, LOTS of fossils that are recognized today Secondary layered rocks, lithified, fossils (not recognized today), tilted Oldest: Primary coarse grained rock, hard, no fossils, igneous rock Murchison and Sedgwick are famous geologist who named different periods of the geologic time scale, specifically the Orodivican, Silurian, Cambrian Permian: Perm provence of Russia, new red sandstone Carboniferous: coal measures, rock made of coal Devonian: Devonshire, Great Britian, old red sandstone Silurian: ancient tribe in South Wales Ordovician: ancient tribe in Central Wales Cambrian: Roman name for Wales...
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- Fall '08