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Exploring Biological Anthropology: The Essentials, 3rd Edition CRAIG STANFORD JOHN S. ALLEN SUSAN C. ANTÓN Copyright © 2013 Pearson Education, Inc. All rights reserved. Chapter 9 Geology and Primate Origins Copyright © 2013 Pearson Education, Inc. All rights reserved. How to Become a Fossil • Taphonomy: The study of what happens to the remains of an animal from the time of its death to the time of discovery – Burial – Geologic processes – Biological processes Copyright © 2013 Pearson Education, Inc. All rights reserved. How to Become a Fossil (cont’d) Petrifaction Trace Fossils Copyright © 2013 Pearson Education, Inc. All rights reserved. The Importance of Context • Stratigraphy – Strata – The principle of original horizontality – The principle of superposition – The principle of cross-cutting relationships – The principal of faunal succession Copyright © 2013 Pearson Education, Inc. All rights reserved. The Importance of Context (cont’d) • The Geologic Time Scale (GTS) – The earth is ~ 4.5 billion years old – Human and primate evolution spans the last 65 million years (Cenozoic Era) – The GTS is divided into Eras, Periods, and Epochs Copyright © 2013 Pearson Education, Inc. All rights reserved. How Old is It? • Relative Dating Techniques – Lithostratigraphy – Tephrostratigraphy – Biostratigraphy – Chemical techniques within sites Copyright © 2013 Pearson Education, Inc. All rights reserved. How Old is It? (cont’d) • Calibrated Relative Dating Techniques – Geomagnetic Polarity • Normal vs. reverse polarity • The geomagnetic polarity time scale (GPTS) • Paleomagnetism • Sediments Copyright © 2013 Pearson Education, Inc. All rights reserved. How Old is It? (cont’d) • Chronometric Dating Techniques – Radiometric dating – Potassium-argon dating – Argon-argon dating – Fission track dating – Cosmogenic radionuclide techniques – Uranium Series techniques Copyright © 2013 Pearson Education, Inc. All rights reserved. How Old is It? (cont’d) • Chronometric Dating Techniques (cont’d) – Radiocarbon dating – Electron trap techniques – Thermoluminescence – Optically stimulated luminescence – Electron spin resonance Copyright © 2013 Pearson Education, Inc. All rights reserved. The Earth in the Cenozoic • Continents and Land Masses – 200 MYA the earth was divided into two major land masses • Laurasia: present-day North America, Europe, and Asia • Gondwanaland: Africa, South America, Antarctica, and Australia/India Copyright © 2013 Pearson Education, Inc. All rights reserved. The Earth in the Cenozoic (cont’d) • The Environment in the Cenozoic – Oxygen isotopes, temperature, and sea level – Paleosols and Loess – Vegetation – Stable Carbon Isotope Ratios in teeth and soil – Animal communities Copyright © 2013 Pearson Education, Inc. All rights reserved. Climate Change and Early Primate Evolution • Changes in the Paleocene: The origin of primates? – Plesiadapiforms • • • • Small brains Prognathic face Postorbital bar Diastema • Why Primates? – Visual predation Copyright © 2013 Pearson Education, Inc. All rights reserved. Climate Change and Early Primate Evolution (cont’d) True Primates of the Eocene Adapoids Omomyoids Continental Drift Strepsirhine-Haplorhine Split Copyright © 2013 Pearson Education, Inc. All rights reserved. CLIMATE CHANGE AND THE ORIGIN OF MONKEYS AND APES The First Monkeys? New World Monkeys Old World Monkeys What favored the origin of anthropoids? The earliest apes Copyright © 2013 Pearson Education, Inc. All rights reserved. Climate Change and Early Primate Evolution Selection Pressures and the Divergence of Monkeys and Apes Evolution of brachiation Middle Miocene forests Dental evidence - a dietary shift Copyright © 2013 Pearson Education, Inc. All rights reserved. Climate Change and Early Primate Evolution (cont’d) The Monkey Tale: What Happened to Primate Diversity in the Miocene? Shift from apes to monkeys Changing environments r-selected vs. k-selected Copyright © 2013 Pearson Education, Inc. All rights reserved. Molecular Evolution in Primates • Molecular phylogeny: a tree of relatedness among taxonomic groups based on a gene or protein • Molecular clock – Calibrated – Rate consistency – Relative rate test Copyright © 2013 Pearson Education, Inc. All rights reserved. A Primate Molecular Phylogeny • • • • Morris Goodman Beta-globin Multiple calibrations Last common ancestor Copyright © 2013 Pearson Education, Inc. All rights reserved.