GEO 1301 Study Guide - Cenozoic, Nonconformist, Mesozoic

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*life never started from scratch: precambrian (no life yet)(algae produces oxygen which produced life, palezoic (life started: plants, mesozoic (reptiles: dinosaurs, cenozoic (from reptiles to humans. *impact made dust, dust got trapped into the atmosphere, solar radiation (sun) did not reach the earth = less food, less plants, etc. 2 proofs: particles in atmosphere settled in different parts of earth back down on the surface and formed a thin layer of ____. Was some mamals but dino"s ate them so when they died they raised. * info but don"t need to know: grand canyon (2km of rocks going up in 1 part recorded formed 2 billion years ago) Relative dating (give a relative age to rockbased on characteristics, older than other, etc) Superposition (1st at bottom is oldest = layers) The stick cut through it = analogy) board example: large rock pit with 1 rock in middlethe rock in middle was last.

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