NATS 1540 Study Guide - Midterm Guide: Mesozoic, Plate Tectonics, Archaeopteryx
5 Jan 2018
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Theories of dinosaur extinction test 1 study notes. Cretaceous period (144- 65 million years ago) thickness of chalk. The continents were shaped much as they are today. Sea levels rise submerging about 30% of the earths present land surface. Dinosaurs and reptiles were dominant vertebrate life. Gastropods, corals, sea urchins flourish and insects evolved. Jurassic period (206 144 million years ago) rocks identified in the jura mountains. Tectonic plate subduction caused to form mountain in the western part. Reptiles adapt to life in the sea, air land. Triassic period (243 206 million years ago) three distinct rocks. During the end of this period pangea began to break up. Climate is warm, becoming semiarid to rid. Six periods: permian, carboniferous, devonian, silurian, ordovician, cambrian. Hot, dry conditions and deserts become widespread. Reptiles develop into carnivores, herbivores, terrestrial and aquatic forms. Carboniferous period (354 290 million years ago) Two major land masses collide; eurasise (north) and godwon (south)
