PPT-Geologic Timescale

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. 01: . Geologic Time . Scale. Huge sections of time are broken down into smaller groups of time:. E. ons, Eras, . P. eriods, and . E. pochs. Eon. is the largest time block. . (kind of like what we would think of as years).. Tutorials. Precise Time & Time Interval Systems & Applications Meeting (PTTI) 2011. Long Beach, CA. 14 November 2011. Ken Senior. U.S. Naval Research Laboratory (NRL). Outline. Definition & Purpose of Timescales. Comparison of Conventional & Short-Age Geology. Faith, Reason, and Earth History. Chapter 14. by Dr. Leonard Brand. Short-age. Geology. Conventional. Geology. Assumptions. Interpretations. Challenges. Mesozoic. Cambrian and Ordovician. Cenozoic. Pre-Belt. Pre-Cambrian. Paleozoic. Page. 1. Geologic Timeline . For example, using fossils, geologists can compare certain geologic strata in Montana with the "type section" of Devonian age rocks in Devon, England and determine that their ages are the same. Radiometric dates tell us that Devonian rocks fall in a range of 369–410 million years ago.. By Paula . Waggy. Franklin High School. With students working in pairs, pass the cardboard or . styrofoam. strips with insects pinned to them but in the wrong time periods. As an alternative, students can use their own insect collections and receive empty strips.. It has been suggested that, sometimes, drastic changes that can form a new species . take . place.. Under this idea, a new species may form after a group becomes separated from the original population.. Relative Dating. How old is the Earth?. The Earth is about 4.6 billion years old. Much of its history is recorded in the rocks. Observations of fossils, rock types, evidence of . faulting, uplift, and folding as well as igneous . 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 (e.g. a granite dike is younger than the surrounding sandstone since it intrudes across the sandstone in an outcrop).. Organization of . Ch. 21-24. Ch. 21.1 – Describes the geologic time scale. Ch. 22 – Precambrian Earth. . Section 1: Early Earth. . Section 2: Formation of the Crust and Continents. . Section 3: Formation of the Atmosphere and Oceans. Fossils. and. Unconformities. The Geologic Cycle. 3 key events: deposition, uplift, erosion. Sedimentation of beds A-D beneath the sea. Uplift above sea level and exposure of D to erosion. Continual erosion strips D away completely and exposes C to erosion. 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 . The geologic time scale divides Earth’s long history into units of time…. Eras. .  . Periods. .  . Epochs. Eras. are divided into . P. eriods. .. Periods. are divided into . Epochs. .. Precambrian. Section 12.1 Discovering earth’s history. Uniformitarianism – the idea that physical, chemical, and biological laws that operate today also operated in the past; the present is the key to the past.. Prof Chris Done, University of Durham. Lecture 1-2 recap:. Black holes and neutron stars binaries. . both show major spectral transition from sum of blackbody disc dominated to . compton. tail dominated. .