Ch 12 Proterozoic Eon

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Proterozoic life (review) oldest evidence for animals * adaptive radiation of acritarchs * * oxygenation of atmosphere eukaryotes ? prokaryotes 2.5 Ga 2.1 1.9 1.2 1.0 0.57 Earth History, Ch. 12 22
Oxygenation of the atmosphere • Most iron-bearing sedimentary deposits younger than 1.9 billion are highly oxidized (red beds) • Cessation of Banded Iron Formation deposition – BIFs are alternating bands of iron-rich layers and chert layers – Very few BIFs younger than 1.9 billion years old (when atmospheric O 2 increased) – Principal source of world’s iron ore Earth History, Ch. 11 23
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: Addendum (2002 news!) Probable trac
Page 25 and 26: Oxygenation of the atmosphere Fe ++
Page 27 and 28: Continental accretion • Lateral g
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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