Download - A GENERALIZED HISTORY OF EARTH
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A GENERALIZED HISTORY OF EARTH
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TIMES This can be done several ways I choose to break Earth’s history
into nine time periods
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~~5 billion years - - - - - 4.6 billion years
Extrapolation for the most part
Formation of solar system—accumulation of space trash
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4.6 billion years - - - - - - -3.8 billion years
Heating and melting of earth
Out-gassing; early atmosphere
Segregation of and cooling of entire Earth
Early crust Early seas Beginnin of Plate
Tectonics Life—single cell,
anaerobic, prokaryotic, bacteria
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3.8 billion years - - - - - 2.5 billion years
Seas, freshsalty Life – earliest
plants, prokaryotic, photosynthesis
Atmosphere, more O, less CO2
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Photosynthesis (within plant cell) Energy (radiant)
CO2 C(in tissues) + O2
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Accumulation of the Iron Formations
2.5 billion years - - - - - 1.7 billion years
Some critical level of oxygen
ppt of iron oxides
Seas lose their Fe
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Generalized reaction Not ballanced or proper oxidation
states
Fein solution + O2 FeO.nH2O ppt
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Sexual reproduction!!!!! 1.7 billion years - - - - - 540 million years
Eukaryotic cells! Life forms go nuts Seas and
atmosphere approach modern compositions
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Importance of sexual vs. asexual reproduction
Asexual (prokaryotic life) like a clone – like-like-like-like-like-like-like
Sexual (eukaryotic life) exchange and mixing of genes – great variability unlike-ikulen-different-efefident-tenidffeetenidffee
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540 million years - - - - - - 245 million years
Hard parts!! Plate movements Fish Land plants Amphibians Seed ferns and
scale trees reptiles
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Hard parts Shell – CaCO3 Kytton – complex, organic, C-bearing Bone – CaPO4 Teeth – CaPO4 Scales -- Cellulose (sort of) – complex,
organic, C-bearing
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Hard parts -- importance Protection and structure KeyKey to fossilization Hence, key to information
preservation
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Shells of various sorts
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Fish have bone and teeth
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245 million years - - - - - 66 million years
Great extinction Plate movements 1 Cone bearing
plants Dinosaurs Mammals Plate movements 2 Birds Flowering plants
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A GREAT EXTINCTION AT245 MILLION YEARS
BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY
marine invertebrates marine invertebrates marine invertebrates marine invertebrates marine invertebrates marine invertebrates marine invertebrates marine invertebrates marine invertebrates marine invertebrates
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PLATE CONFIGERATION ATABOUT 180 MILLION
YEARS
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Some new players in the game of life
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PLATE CONFIGERATION AT ABOUT 120 MILLION
YEARS
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66 million years - - - - - 1.6 million years
Extinction Earliest horse Grasses Earliest hominids
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A MAJOR EXTINCTION AT66 MILLION YEARS
BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY BIO FAMILY
DINOSAURS
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Three new players in the game of life
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1.6 million years - - - - 1,200 years NOW
The ice ages
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The Ice Ages A time of climatic vairation
Four times cold Four times ice caps and glaciers Spaced by warm (like now) Including warm before and now
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AND CAME THE ICE AND COVERED ~25% OF THE
LAND