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. 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. 1 granular geologic materialgranular geologic materialSEDIMENTARY ROCKSEDIMENTARY ROCKlithifiedlithified granular geologic materialgeologic material Comes from:Comes from:Physical weatheringPhysical w In depth: chapter 19. Geologic Time Scale. Examining layers of sedimentary rock, scientists have put together a chronology of Earth’s history.. It is divided into 4 Eras:. 1. Precambrian (3.5 . bya. 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 (. 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).. To learn how the geologic timeline was made and how the length of the various periods are different. Agenda. Progress reports – need to be signed by Parent/guardian. Geologic History Notes. Project –highlights. 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.. a. Fossils. 3. Geologic Time Scale. 4. Geologic Belts. 5. NC Geologic History. How do we know . geologic . history. ?. Earth's History. Earth's history spans over a length of . 4.5 billion . years. Geologists have divided that time into units based on major geologic events and life forms. Normally we think of time in terms of days or years but geologists commonly refer to events that happened millions or billions of years ago. For example earth is approximately 4.6 billion years old. GEOLOGIC TIME. H. ub. . (ASH) . p. roject. Reservoir Characterization Studies. Pennsylvania Geological Survey (Pittsburgh, PA). A geologic study of the potential to build an Appalachian storage hub. Data collection and project database development. Greyson Dunn. Method. Time step of a year. Iterate for 1000 years to simulate timescale of ocean circulation. Solve systems of ODE numerically using 4. th. order Runge-. Kutta. method.. Note: I preferred convention to switch S1 and S2. 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. .