PPT-A Trip Through Geologic Time

Chapter 10 Section 1 Fossils Fossils are the preserved remains or traces of living things Fossils provide evidence of how life has changed over time How Fossils Form Most fossils form when living things die and are buried by sediments. 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. Chapter 7 lesson 4. What is the geologic time scale?. Geologists use the geologic time scale to show Earth’s history.. It is a record of the geologic events and the evolution of life forms as shown by the fossil record.. 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.. 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 (. 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 . 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. 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. 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 . 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.. 99.9% of all living things that have ever existed on earth have gone extinct. earth has experienced 5 five extinctions . Geologic time scale. Era. Largest unit of geologic time . lasts tens to hundreds of millions of years and consists of two or more periods. . ___When you started second grade. ___When you were born. ___ When you started kindergarten. ___When you learned to ride a bike.. ___ When you learned to walk.. ___ When you learned to read.. ___ When you lost your first tooth.. 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. book for . testing purposes. Some pictures in this slideshow may show a slightly different version. Neither is right or wrong, just different interpretations.. Geologic time is divided into giant chunks of time called .