Fossil Dating Ppt

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Key Beds, Absolute Dating and FOSSILS - 21 .4 - Key Beds, Absolute Dating and FOSSILS - 21 .4 | PowerPoint PPT presentation | free to view . The Rock and Fossil record - Title: Slide 1 Author: Owner Last modified by: OHMS Created Date: 2/17/2010 2:49:15 AM Document presentation format: . . .
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)
•A substantial hurdle is the difficulty of working out fossil ages . Beds that preserve fossils typically lack the radioactive elements needed for radiometric dating . This technique is our only means of giving rocks greater than about 50 million years old an absolute age, and can be accurate to within 0 .5% or better . • To determine the age of fossils there are indirect methods, The Relative . . .
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 .
pages .ucsd .edu › ~jmoore › courses › anth42web › DATINGmethods .pdf
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;
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 previously dated to approximately 507 . . .
Fossil Dating . Plants and Animals Can Become Fossils . Transitional Fossils . Geological Functions of Fossils . Evidence for Evolution Fossils . Acid Preparation of Fossils . Fossil Quiz ( ppt format) See Also: Petrified Wood, Geological Time, Archaeology, Rocks . Free Science Powerpoints Index . For Kids . What Is the Difference between a Fossil and . . .
The Fossil Record - Title: The Fossil Record Author: Mark Last modified by: Owner Created Date: 5/10/2003 9:41:00 PM Document presentation format: On-screen Show (4:3) Company | PowerPoint PPT presentation | free to view
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