EAE1011 Lecture Notes - Lecture 27: Graptolithina, Permian, Burgess Shale
10 Aug 2018
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Latest proterozoic life: at the end of proterozoic (precambrian) life was just shifting toward multicelled, complex forms. Cambrian life: rodinia has broken up into continents: laurentia, siberia, china, baltica, kazakhstania, Why the explosion: environmental changes, development of infauna (burrowing organisms), and teeth. Simple genes - easier for evolution to have wild experiments. First predators - leads to e(cid:448)olutio(cid:374)ar(cid:455) (cid:862)ar(cid:373)s ra(cid:272)e(cid:863) Sediment-laden turbidity currents bury both shallow and deep-water marine animals: these turbidite sediments and shales are deposited in a deep-water basin next to an. Support vast reefs, grazed by many animals enormous algal reef with a vertical drop-off of several hundred meters. The rest of the paleozoic: almost exponential increase in animal diversity through the early paleozoic, stabilising in the. Ordovician: ordovician/silurian, high diversity of fauna, trilobites begin to reduce, archaeocyathids now extinct. Permian: evolution of reptiles and mammallike reptiles, precursors to dinosaurs and mammals.
