BSC-1005 Lecture Notes - Lecture 2: Uranium-235, Dinos, Mesozoic

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Lecture 2 - age of dinosaurs: what was the mesozoic era like in terms of climate, plants, animals, etc, dinosaurs lived from 238 mya > 65. 5 mya. A. 1. called the mesozoic era or age of dinosaurs , divided into 3 periods. Triassic (251-200 mya): oldest dinos show up midway. Jurassic (200-146 mya); largest dinos here (a. 1. b. 1) fact: jurassic park used dinos from other periods, A. 2. we know because of half-life dating of uranium 235. A. 2. c) during dino age > 2ndary materials @ known rates (can compare original to final to assess age: climate was warm! B. 1. arid near equator; @ poles = wet + rainy w/ no ice caps; mid latitudes mostly like florida. B. 2. mainly flat (few mtns developed yet), but many volcanoes (changed climate: pangea during triassic period! Plate tectonics = continents mving apart b/c of volcanic seafloor spreading in oceans. Pangea broke apart b/c of p. t. during cretaceous (c. 1. a. 1) looked like now after.

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