PPT-GY111 Physical Geology Geologic Time Measurement

Geological Clocks Geologic time determination is subdivided into 2 categories Relative Dating simply determines whether or not an event occurs before or after another event eg a granite dike is younger than the surrounding sandstone since it intrudes across the sandstone in an outcrop. Astronaut Geology Training We began the geology training course with 29 astronauts John Glenn attended some of the early classes but was not formally in cluded since he had other obligations and was not expected 1. HISTORICAL GEOLOGY. LECTURE 1. STRATIGRAPHY. Stratigraphy. :. Many past geologic events have resulted in . strata. or . layers. of sediment which have formed a stacked vertical sequence of . sedimentary rocks. How long ago were the dinosaurs here? How do we even describe geologic time anyway?. EONS. which are divided into . ERAS. ,. which are divided into. . PERIODS. ,. which are divided into. . EPOCHS. Evolution of the Continents. Important Terms. Craton: interior of continents made of stable Precambrian and Paleozoic . rocks.. Shield: portion of Craton composed of older Precambrian . rocks.. Platform: portion of Craton made of younger Paleozoic . 8. th. Grade Science. Geologic Time. Geologic time. . - Earth’s history is divided into units of time that make up the . Geologic . T. ime . S. cale. .. Time units on the scale are based on the appearance (. “Civilization exists by geologic consent” -Will Durant. Where are the world’s great cities located and why?. Why are Earliest Humans Here?. East African Rift. Water. Animals. Preservation of fossils. Types of Rocks. Rock: an aggregate of one or more minerals. Igneous Rocks: crystallize from a magma. Sedimentary Rocks. Clastic: formed by the erosion of pre-existing rocks. Chemical/Biochemical: precipitated from chemical reactions. East-Central Idaho — . Metasedimentary. Strata, . Ore . Types, . Folds, Dikes, and Metamorphic Overprint. Art . Bookstrom. , Steve Box, Pam Cossette, . Tom Frost, and Shane . Kostka. . Regional Geologic Map showing the Mesoproterozoic Belt-Purcell basin and the Lemhi sub-basin . Earthquake Mechanisms. Brittle Mechanical Model: “stick-slip”. Focal point: 3D point inside the lithosphere where the seismic event occurs. Epicenter: projection of focal point to the map surface . Curriculum Overview. Steve Taylor, RG, PhD, Professor of Geology. Earth and Physical Science Department. Introduction. ES420 Med Geo Class Format. Thematic Topics. Conclusion. INTRODUCTION. Medical Geology: the study of the impacts of geologic. Metamorphism. Causes of Metamorphism. Elevated T & P. Fluids (H2O, CO2, CH4, etc.). Directed Stress. Types of Metamorphism. Regional: occur along convergent plate boundaries.. Contact: occurs along margin of a magma intrusion.. Gary Smith. Professor, Earth & Planetary Sciences. Director, Office of Support for Effective Teaching. University of New Mexico. Wisdom from a UNM Student. “Don’t re-teach yourself. Standing at the front of the room talking and writing on the board is you re-enforcing what . Stress & Strain. Stress: a force applied to an area.. Example: tire pressure in psi.. Strain: a change in original shape or volume (produced by stress).. Elastic strain: analogous to a steel spring or rubber band.. Important Terms. Craton: interior of continents made of stable Precambrian and Paleozoic rocks.. Shield: portion of Craton composed of older Precambrian rocks.. Platform: portion of Craton made of younger relatively undeformed Paleozoic sediments..