Geological Dating Part II Absolute

Absolute Age Dating

This method enables scientists to determine the actual age of a rock

Radioactive isotopes are found in….

Comparing Relative to Absolute (Numerical)

Radiometric Dating- Rocks

• Define• Ratio• Rate

The original radioactive element is called the parent and the new element is called the daughter

Half-Life• At the end of 1 half-life what

is the relationship of daughter to parent material?

• If 2 rocks were found one containing 2 g of A and the other 4 g of A which rock is older?

• What percent of the sample is Daughter B at 4 Half-Lives?

Clocks in Rocks

• What is the percent of atoms of the parent and daughter element at a half-life of…?

1, 2 & 5

• How can a scientist determine the actual age with this information?

• Now you are ready to click on:

http://www.sciencecourseware.org/VirtualDating/files/1.0_ClocksInRocks.html

Once Living thingsInterpret Evidence

Direct Evidence of past

Fossils

Radiocarbon Dating - Organisms

• Carbon C-14 is changed into Nitrogen N-14 during decay of living organisms.

• Now try this: http://www.sciencecourseware.org/VirtualDating/files/RC0/RC_0.html

Bibliographyhttp://earthsci.org/fossils/geotime/radate/cycle.gif

http://www.math.psu.edu/jech/pictures/GrandCanyon/rocks.jpg

http://earthobservatory.nasa.gov/Study/Paleoclimatology_CloseUp/paleoclimatology_closeup_2.html

www.nps.gov/.../state/tx/1968-7/images/fig26.jpg

http://www.calacademy.org/exhibits/california_hotspot/habitat_redwoods.htm

http://www.geo.cornell.edu/eas/education/course/descr/EAS302/Timescale.GIFitos.edu/earth-http://www.cerrscience/images/ESCI_110_Lecture_notes_images/Goosenecks.jpg

http://geoinfo.amu.edu.pl/wpk/pe/a/harbbook/c_viii/images/geomorph/Car0140.GIF

http://serc.carleton.edu/images/quantskills/methods/PBandJ_175.jpg

http://evolution.berkeley.edu/evosite/lines/images/strat_column.gif

http://comp.uark.edu/~sboss/seds02.jpg

http://www-rohan.sdsu.edu/~rhmiller/geologictime/dikesTexas1.jpg

http://www.fas.org/irp/imint/docs/rst/Sect2/correlation.jpg

http://www.mhhe.com/earthsci/geology/mcconnell/gti/images/utah.JPG

http://www-rohan.sdsu.edu/~rhmiller/geologictime/dikesTexas1.jpg

http://www.calstatela.edu/faculty/acolvil/sediment/superposition.jpg

http://images.google.com/imgres?imgurl=http://www.winona.edu/geology/MRW/mrwimages/Earth%2520History/metrx_dating.JPG&imgrefurl=http://www.winona.edu/geology/MRW/maps.htm&h=553&w=530&sz=65&hl=en&start=2&tbnid=1fEgWVmmSwDmDM:&tbnh=133&tbnw=127&prev=/images%3Fq%3Dradiometric%2Bdating%2Brocks%26gbv%3D2%26svnum%3D10%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DG