PPT-Geologic Time

Chapter 211 22 23 24 Why do we care By studying the characteristics of rocks and fossils within them geologists can interpret The environment the rocks were deposited in Reconstruct Earths history. 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.. Who was James Hutton?. In the late 1700s, James Hutton began to question some of the ideas regarding the Earth.. He found fossils and saw them as evidence of life forms that no longer exist. . Different types of fossilized creatures were found in different layers of rock.. 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).. 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. Regents Earth Science. Miss Wojdan. The . presence of coal in Antarctica indicates . that. Forests can grow on continental . . glaciers. Coal can form in cold climates. Antarctica’s climate was once warmer. 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.. Relative age dating:. Age of a rock compared to other rocks. Used to understand a sequence of events. What are the ways to tell . RELATIVE AGE. .. 1. Law of Superposition (Undisturbed) . 2. Extrusion & Intrusion (Igneous Rock). Geologic Time and Evolution Earth Has a History Geologic materials record enormous changes. Earth is a complex, evolving system. Physical and biological systems continuously interact. Earth constantly changes and has done so through time. 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. . On the Cutting Edge – Professional Development for Geoscience Faculty . Teaching About Time Workshop. Ilyse Resnick. Premise of talk. The representation of extreme temporal magnitudes is subject to the same forces that guide our comprehension of conventional time. Absolute vs. Relative . Age. Relative Age. Determining the age of an object in relation to other objects. “Estimate”. Index Fossils, Rock layers. Example. : A friend tells you . he . has 2 brothers – one that’s older than . What is it and Why do we care? . What is the geologic time scale? . . Geologic Time Scale:. A record of the Earth’s . history broken up into . various units of time that. are based on types of . fossils contained within .