Dating Fossils Ppt
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Dating Fossils And Rocks - slideshare .net
Dating fossils and rocks - SlideShare
PPT - Fossil Dating PowerPoint presentation | free to . . .
PPT - Relative and Absolute Dating PowerPoint presentation . . .
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Example of Dating Assumptions Find a fossil with a measured ratio of 16 trillion to 1 (C12 to C14) This means 4 half-lives have expired giving a date of about 23,000 years 8 trillion to 1 : 1 half-life instead of 4 - age 5,000 What if the ratio started at: 2 trillion to 1 : 3 half-lives instead of 4 - age 17,000 28 .
Quantity of C-14 in a FossilThe C-14 dating method relies on measuringthe amount of C-14 in the fossil If there is a lot of C-14 remaining in the fossil , we assume it has not been dead very long If there is very little C-14 remaining in the fossil we assume most of it has decayed and the animal lived a long time ago (i .e . 30,000 or more years)
Fossil Dating HOW DO WE KNOW THE AGE OF FOSSILS ? Scientists use 2 methods to determine the age of fossils : 1 . Relative Dating 2 . Absolute Dating Relative Dating Shows . . . - A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow .com - id: 430b64-MGZiM
Relative and Absolute Dating . Description: Relative and Absolute Dating Hill Science 6 Relative Dating Fossils can be dated relative to one another by noting their positions in strata . Fossils found in lower . . . - PowerPoint PPT presentation . Number of Views: 289 . Avg rating:3 .0/5 .0 . Slides: 19 .
1) Radiocarbon dating measures the half-lifeof carbon isotopes . 2) This method is most accurate for only the last 50,000- 70,000 yBP . Radiopotassium Dating 1) Radiopostassium dating measures the potassium radioisotope in igneousrock associated with fossils . 2) K-> Ar ½ life is 1 .3 bil, and can be used to date fossils older than 200,000 years .
E5 .3D Describe how index fossils can be used to determine time sequence . E5 .3g Identify a sequence of geologic events using relative-age dating principles . Relative Dating In the same way that a history book shows an order of events, layers of rock (called strata) show the sequence of events that took place in the past .
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Relative Dating and Index Fossils . Relative dating : Any method of determining whether an event or object is older or younger than other events or objects . Example: How many students in the class have an older sibling? Younger sibling? Index fossil : A fossil that is found in the rock layers of only one geologic age and is used to establish the . . .
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Copy of sciences, molecular biology chapter 25 test preparation flashcards taken from chapter 25 of sciences, etc . Brought to you by sciencing specifically, a process called radiometric dating fossils and relative dating ppt scientists to determine the ages of objects, including the ages of rocks, ranging from thousands of years old to billions of years old to a marvelous degree of accuracy .
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Paleoanthropological methods: Dating fossils "Archaeologists will date any old thing" (Jim Moore, UCSD) Taphonomy: study of processes of fossilization (literally, "laws of burial"; study of diagenetic processes acting on a dead animal's remains) . Diagenesis: sum of the physical, chemical, and biological changes affecting a fossil -bearing sediment;
Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it . Relative Dating The majority of the time fossils are dated using relative dating techniques . Using relative dating the fossil is compared to something for which an age is already known . For example if you have a fossil trilobite and it was found in the Wheeler Formation . The Wheeler Formation has been . . .
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Dating Fossils Ppt
