PPT-Geologic Column

Accuracy amp Assumptions of Radiometric Dating Radioactive Decay Rubidium 37 87 Strontium 38 87 Radioactive Decay 1 2 3 4 5 All 12 14 18 116 6 7 8 9 Amount of Parent Isotope. 1 granular geologic materialgranular geologic materialSEDIMENTARY ROCKSEDIMENTARY ROCKlithifiedlithified granular geologic materialgeologic material Comes from:Comes from:Physical weatheringPhysical w 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. 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. 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).. 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. Faith, Reason, and Earth History. Chapter 14. by Dr. Leonard Brand. Short-age. Geology. Conventional. Geology. Assumptions. Interpretations. Challenges. Starting Assumptions. Affect how scientists interpret data. 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. Basic. Gold. Tables. Column 1. Column 2. Column 3. Basic. Black. Column 1. Column 2. Column 3. Alternating Rows Gold. Column 1. Column 2. Column 3. Alternating Rows Black. Column 1. Column 2. Column 3. 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.