BIOC58H3 Lecture 7: BIOC58H3 Lecture Notes: Key Dates
8 Nov 2017
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90-100mya, megathermal forests (rainforests + warm seasonal) dominated all continents except antartica which had both temperate and megathermal forests. 60-90mya, climate cooled, warm rainforests retreated; andes uplift @ 65mya. 30-45mya, rapid cooling (ice sheets), warm rainforests shrank; became current distribution at 30mya, wetlands formed at 30mya. 15-25mya, planet warmed again, megathermal forests expanded; now was ranged to southern africa. 10k-15mya, se asian forests went from warm seasonal warm rainforests, near-modern forest type distribution emerged, Pleistocene ice ages began (2mya), 10mya wetlands drained and formed amazon river (bc of andes), younger dryas at start of. 500mya, calcifying-organisms produced reefs (tabulate/rugose corals, mollusks, crustaceans, etc) 250mya, tabulate/rugose corals extinct (due to ocean co2 changes), scleractinian corals appear in fossil record. 220mya, scleractinian distribution/abundance peaks, declines & extinctions thereafter; modern reefs created. 200mya, fw families diversified due to breakup of pangaea and formation of long-lived rift lakes.
