2�7 Notes - trace fossils are especially important...

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February 7, 2008 1889-1892 - Hatcher finds 32 ceratopsians (Hatcher invented quarry maps) 1884 - ceratosaurus, first really good carnivore skeleton Charles Knight - the first great dino illustrator 1902-08 - tyrannosaurus rex found at Hell Creek, montana by Barnum Brown Triceratops: 26’ long, 7 tons, 10’ tall Trex: 42’ long, 13’ tall @ hips, 7 tons Apatosaurus: 80’ long, 15’ tall @hips, 35+ tons 1910 - new kinds of hedrosaurs Roy Chapman Andrews - The real Indiana Jones Franz Nopcsa - paleanologist from transylvania, tried to determine dino sexes. Portions of the 1947 Zallinger mural at Peabody Museum, 110’ w X 16’ high 2 kinds of fossils: Body fossils: preserved body parts such as bones, shells, eggs, skin impressions Trace fossils: preserved marks on the planet left by activity of ancient organisms, such as footprints, nests, tooth marks, coprolites, fossil regurgitates.
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Unformatted text preview: trace fossils are especially important b/c they tell us about behavior. ← how to fossilize a bone: • death followed by burial • permineralization - pore spaces in the bone are filled w/ minerals precipitated ground water • replacement - original material is replaced by other minerals. rare in bones, com-mon in wood. complete permineralization and replacement = petrification • 10,000 yrs min fossilization time ← Sedimentary rocks: formed in layers, derived from the weathering of pre-existing rocks, of precipitated from aqueous solution. igneous rocks: crystalized from liquid magma or lava metamorphic rocks: sedimentary rocks that have been physically and/or chemically altered by heat and/or pressure w/o melting. marine transgression - sea level is going up marine regression - sea level is going down...
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