Fossils and the Rock Record acloutier copyright 2011 February

Fossils and the Rock Record by Annie Cloutier Sandwich High School 2011 copyright Chapter 21 Earth & Space Science GTS

How can we measure time ? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Earth’s History is Measured in GTS Geologic Time Scale ,[object Object],[object Object],[object Object],[object Object]

MYBP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Percent of Time 90% of Earth’s GTS was in the PrecambrianTime 6 % Paleozoic 4% Mesozoic 1% Cenozoic

paleo means “ancient” zoic means “life” Paleozoic means “ancient life” ,[object Object],[object Object]

Relative Dating is not going to a movie with Grandma…

Relative dating of rocks is what James Hutton’s hypothesized in 1770 …theory of Uniformitarian' s - states that the processes occurring today have always been occurring since Earth was formed. ,[object Object]

Rocks are never left alone. ,[object Object]

Original horizontality is the natural layering of sedimentary rocks deposited in a horizontal or nearly horizontal layer. ,[object Object],[object Object]

Exceptions to the rule ,[object Object]

Unconformity is when an erosion surface might become buried by the deposition of younger rocks. Disconformity is when horizontal sedimentary rocks overlay other horizontal sedimentary rocks ,[object Object]

Absolute Age of Rocks STOP let me see you license I don’t believe how old you are ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Uranium 238 converts into Lead 206

CSI crime scene investigation uses Carbon ,[object Object],[object Object],[object Object],[object Object],[object Object]

Time is relative to the life forms existing and to the significant objects in the Universe. ,[object Object],[object Object]

The end of measuring the passing of time time machine time machine

Fossils and the Rock Record acloutier copyright 2011 February

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Fossils and the Rock Record acloutier copyright 2011 February