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geos dino notes - Dino notes The worst thing about the...

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Dino notes January 17, 2008 The worst thing about the object that struck earth 65 Ma was: a) its toxic composition b) the site of the impact c) its velocity (correct answer) d) the eruption it caused e) all of the above Lines of Arrested Growth (LAGs) = show age of a dinosaur Found in Bones Similar to tree rings
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Dino notes Gigantoraptor 26’ long, 11’ at hips, 3000 lbs. Related to Oviraptor, only BIGGER LAGs show age - Gigntoraptor grew extremely fast, died at age 11 Lived 80 Ma Warm or Cold blooded Stratigraphy Study of rock layers Reconstruct ancient environments and the evolution of ancient landscapes Correlate rocks of same are that are widely separated geographically Biostratigraphy, magnetostratigraphy, carbon isotope stratigraphy, absolte dating by radio isotopes. Principle of faunal succession “fossil species succeed each other in a definite and recognizable order” Sedimentary rocks represent time: lower = older, upper = newer (Law of Superposition) Distinctive fossils or assemblages of fossils can be used to correlate widely separated rocks as being the same age. Shelly maine fossils and microfossils, and pollen are usually best. Lingo Species: a population of organisms that can interbreed to produce fertile offspring. Genus: a collection of one or more species (pl. Genera) Gradualism, uniformitarianism: biological and geological changes happen very slowly through time. 5 major mss extinctions (three of interest): Permo-triasic, 250 Ma - made way for ancestors of dinos. End-Triasic, about 200 Ma - took out last of large archosaur competition to the dinos K-T, 65 Ma, took out dinos Proposed causes of dino extinction out-competed by smarter, egg-eating mammals • disease falling sea level volcanically driven climate change astroid strike January 29, 2008 Platypus Lay eggs, 40,000 glands in bill that sense electrical currents 112 Ma platypus jaw found with large nerve canal to glands kinds of mammals: placental, marsupial, monotreme new fossil almost doubles the age of the oldest known monotreme would you expect the oldest monotreme fossils be older that the oldest placentals
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Dino notes According to Terri, warm bloodedness evolved n out lineage: a) 280-250 Ma (correct answer) b) 250-200 Ma c) 200-100 Ma d) We don’t know Why pits in the muzzle indicated whiskers: pits indicated whiskers whiskers indicated fur fur indicated warm-bloodedness Why is extinction important? Extinction provides for the evolution of other animals. Warm-bloodedness in Great White Sharks tells us: Warm bloodedness has evolved independently more than once. Evidence for K-T impact world wide clay layer with iridium, shocked quartz, spherules, and carbon 65 Ma tsunami deposits ringing the Caribbean Chicxulub crater It was a BIG explosion Astroid of comet was 10km (6 mi) across Moving at 75,000 km/hr (45,000 mi/hr) 5 billion times the energy of Hiroshima world wide forest fires, tsunamis, acid-rain, year-long “nuclear winter”
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