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Hadean 4.5BYA
- Earth struck by Mars sized planet causing global melting of crust
- Rapid rotation of earth on its axis (4hrs)
-
Haden 4-3.8BYA
- Cooling of earth's crust by COMET ice: during Late heavy bombardment, formed Earth's oceans
- delivered enough organic material for life to emerge
-
Hadean evolution events
- abiogenesis may have proceeded prior to origin of life, with
- Lipid world-->PAH-->PNA-->RNA-->Viroid-->DNA-->protocellular-->cellular world (LUCA)
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Archaean Era (3.8-2.5Bya)
- Prok ONLY life on planet
- Carl Woese's subkingdoms
- 1. Crenarchaeota (1st G1P lipids)
- 2. Monoderm eubac (1st G3P lipids)
- 3. Diderm Eubac (1st double membrane)
- 4. Euryarchaeota (1st histone proteins)
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Proterozoic Era (2.5B -542MYA)
- 1. Unikont amoebae (1st EUKARYOTES)
- 2. Bikont amoeabae (1st Double flagella)
- 3. Glancocystophytes (1st Chloroplasts)
- 4. Rhodophytes (1st RED algae)
- 5. Chlorophytes (1st internal diploid zygotes)
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Cambrian Era
- *1st plants to colonize LAND
- ie, charophytes
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Ordovician Era
- *1st true LAND plants - no need for h20 areas
- ie Marchantiopsida, or liverworts (1st embryophytes)
- (likely fungi & plants symbiotic relationship)
-
Silurian Era
- Anthoceratopsida, or hornworts (sporophyte stems): catch more light
- Bryopsida: true mosses (sporophyte stems)
- Rhyniopsida: non-woody tracheophytes
-
Devonian Era
- Lycopsida, single veined leaves. and Then…
- Filicopsida: true FERNS, multi-veined leaves to capture sunlight
- also progymnosperm (tree ferns) and..
- pteriiodosperms (seed firms)..Archaeosperma seeds
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Carboniferous Era
- Gymnosperm: naked seed plant
- ie cycads & ginko
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Permian
- Gymnosperms: Conifers w/needle leaves
- help for year round photosynth even in winter climates
-
Triassic Era
- Gymnosperms: gnetales w/double fertilization using DIPLOID endosperm & diploid zygote
- also Angiosperms: flowering seeds
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Jurassic Era
- Angiosperms (Nymphaeles, water lilies w/diploid endosperm for zygote nutrition)
- Angiosperm Dicotyledons: 2 embryonic seed leaves (ie, magnolias w/triploid endosperm)
-
Cretaceous Era
Angiosperm monocotyledons: w/one embryonic seed leaf but still triploid endosperm
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