NATS 1540 Study Guide - Final Guide: Paleozoic, Mesozoic, Laurasia
5 Jan 2018
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Mesozoic era comprised of cretaceous, jurassic, triassic: cretaceous (144-65 ma) Continents shaped much like they are today. Dinosaurs are dominant vertebrate life forms on earth. Several mass extinctions: jurassic (144-206 ma) Super continent of pangea begins to breakdown. North america separates from eurasia and africa. Reptiles adapt to life in sea, air, and on land. Dinosaurs are dominant reptile life on land. Amphibians are succeeded by newer species of frogs, toads, salamanders: triassic (206-248 ma) Pangea covers nearly a quarter of the earth"s surface. Mass extinction occurred reducing some life forms. Palaeozoic era comprised of permian,carboniferous,devonian, silurian, ordovician,cambrian: permian (248-290 ma) Glaciers are present in india, australia and antartica hot conditions everywhere else. Mass extinction towards end of period with corals: carboniferous (290-354 ma) Two major land masses form ; laurasia (north) and gondwana (south) Both laurasia and gondwana are mountain ranges. Land on earth is dominated by trees: devonian (354-417 ma)
