EPSC 201 Lecture Notes - Lecture 22: Homo Erectus, Pleistocene, Seafloor Spreading
30 May 2016
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Acadian orogeny uplifts early appalachian mountains: new species of trilobites, eurypterids, gastropods, crinoids, and bivalves replaced those lost to extinction, the middle paleozoic: life arrives on land, around 420 ma: life emerges from the sea, adapts to living and reproducing on land, first amphibians in late devonian: tiktaalik fossil, crustaceans, spiders, scorpions, insects evolved, land plants evolved, developed: Thrust faults emplaced precambrian basement atop paleozoic sedimentary rocks: rocks across north american continent were impacted, late paleozoic era, largest mas extinction event at end of permian period, >95% of marine species disappeared, possibly related to intense volcanism. Shorter jaws, rounded scales, symmetrical tails, specialized fins: huge swimming reptiles and giant turtles (4m shells, flowering plants (angiosperms) and hardwood trees, mammals expanded and specialized but remained small, the k t boundary event , widespread extinction occurred at the end of the cretaceous period, disappearances include.
