ISCI 2A18 Study Guide - Final Guide: Permian, Bouma Sequence, Hobbit
6 Dec 2016
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Life on earth 3. 5 bya (oldest fossils are cyanobacteria) People: l. bowen bowen"s reaction series of different mineral crystallization temperatures. Alfred wegener initially proposed continental drift, continents plowed through seafloor. Harry hess recognized mors as sites of seafloor spreading (1962), identified convection currents as driving force behind plate tectonics. Miller and urey experiment to simulate conditions on early earth, produced amino acids from inorganic material. Laurence sloss identified a series of unconformity-bounded sequences on n. american craton that recorded periods of deposition and erosion as a result of changes in sea level. Walter and luis alvarez evidence for asteroid impact as a cause of cretaceous mass extinction, thin clay layer w/30x natural iridium levels, iridium found in meteorites. Bergman bergman"s rule, body mass increases with colder climate. Komatiites rocks formed from cooling magma, very dense (more than oceanic crust), earliest ocean crust. Basalt mafic lava, silica-poor, oceanic crust, more dense. Andesite felsic lava, rich in silica, continental crust, less dense.
