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BYU - PHY S 100 - Chapter 28, Week 12 Notes - Class Notes

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BYU - PHY S 100 - Chapter 28, Week 12 Notes - Class Notes

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background image Chapter 28: Geologic Time   Relative Time  •  Determination of event sequences relative to each other   Original horizontality   ▪  Sedimentary rocks deposit in horizontal layers  Superposition  ▪  Oldest layer on bottom, youngest on top  Inclusion  ▪  Solids materials like pebbles and sand enclosed within another solid like quartzite are 
older than the rock that encloses them 
Cross-cutting relationship  ▪  Rocks are older than the faults or rocks that cross-cut them   Faunal succession  ▪  Within stacks of sedimentary rocks is a pattern of change in types of fossils contained 
in layers. Fossils help us determine the relative age of different layers 
•  Unconformities:   Gaps in geologic record (erosion destroyed layer, certain fossils missing, etc.)     Absolute Time  •  Numeric or quantitative measure of time  •  Earth's age: about 4.6 billion years old  •  Radioactive dating:  One element (parent) decays to form another element (daughter)  Value of half-life different for each radioactive isotope  Fission-track dating: a type of radioactive decay clock that uses the tracks created by 
uranium fission decay to determine the age of geologic events 
   Geologic Column  •  Chart that shows subdivisions of geologic time  •  Divided into eras:   Precambrian: single-celled organisms, primitive life forms  Paleozoic: marine invertebrate (sponges, corals, mollusks, etc.), fish, amphibians, reptiles, 
land plants 
Mesozoic: dinosaurs, birds, small mammals, flowering plants  Cenozoic: mammals (us!)   

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School: Brigham Young University
Department: OTHER
Course: Physical Science
Professor: Patricia Ackroyd
Term: Spring 2017
Tags: absolute dating
Name: Chapter 28, Week 12 Notes
Description: Relative and absolute time
Uploaded: 12/10/2017
1 Pages 20 Views 16 Unlocks
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