2/5 Notes - February 5, 2008 CitN: Velociraptor forearm of...

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February 5, 2008 CitN: Velociraptor forearm of a raptor specimen has quill knobs in some modern birds, ligaments attach secondary flight feathers to quil knobs strong direct evidence of feathers in velociraptor Carbon Isotope Stratigraphy all rocks form P-T boundary have small C-13 to C-12 ratios allows identification of P-T boundary anywhere it is exposed consistent with huge methane release from melting methane hydrates Magneto Stratigraphy earths magnetic field leaves a signature of its polarity in rocks as they form the polarity occasionally reverses patterns of reversals allows matching up of rocks with the well-established global history of reversals to get a date if you measure an orientation that doesn’t point north or south, your plate has ro- tated. Biostratigraphy use fossils to match rocks that are far apart IE, if you find the same species of Megalosaurus in a layer of rocks in England and in Colorado, they’re the same age
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This note was uploaded on 04/03/2008 for the course GEOS 216 taught by Professor Richardthompson during the Spring '08 term at University of Arizona- Tucson.

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2/5 Notes - February 5, 2008 CitN: Velociraptor forearm of...

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