Ch 12 Proterozoic Eon

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Proterozoic continents • Major cratons were assembled by the suturing of protocontinents • Once cratons formed, incremental growth of continents occurred through continental accretion Earth History, Ch. 12 26
Continental accretion • Lateral growth of a continental margin by suturing of a microplate and/or compression and metamorphism of sediments Earth History, Ch. 12 27
Page 1 and 2: Ch. 12 Proterozoic Eon • Proteroz
Page 3 and 4: Modern stromatolite structure Earth
Page 5 and 6: Proterozoic bacterial filaments (pr
Page 7 and 8: Endosymbiont theory • Cytoskeleto
Page 9 and 10: Lynn Margulis • National Academy
Page 11 and 12: Early Proterozoic life 1.9 Ga proka
Page 13 and 14: Proterozoic acritarchs Bar scale =
Page 15 and 16: Neoproterozoic life • The evoluti
Page 17 and 18: animal embryos (570 Ma) from China
Page 19 and 20: Neoproterozoic life • Skeletal fo
Page 21 and 22: Addendum (2002 news!) Probable trac
Page 23 and 24: Oxygenation of the atmosphere • M
Page 25: Oxygenation of the atmosphere Fe ++
Page 29 and 30: Assembly of Laurentia • First ste
Page 31 and 32: Assembly of Laurentia • Second ma
Page 33 and 34: Midcontinent rift •Midcontinent R
Page 35 and 36: Earth History, Ch. 12 35
Page 37 and 38: Gravity survey Earth History, Ch. 1
Page 39 and 40: Assembly of the supercontinent Rodi
Page 41 and 42: Breakup of Rodinia—another failed
Page 43 and 44: Earth History, Ch. 12 43
Page 45 and 46: Iowa’s Precambrian record • Onl
Page 47 and 48: Sioux Quartzite southern Minnesota
Page 49 and 50: Snowball Earth?? Locations of known
Page 51 and 52: Snowball Earth? Earth History, Ch.

Ch 12 Proterozoic Eon

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