The three main methods used to date sedimentary rocks ...
The three main methods used to date sedimentary rocks ...
The three main methods used to date sedimentary rocks ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>The</strong> <strong>three</strong> <strong>main</strong> <strong>methods</strong> <strong>used</strong> <strong>to</strong> <strong>date</strong><br />
<strong>sedimentary</strong> <strong>rocks</strong><br />
Ben<strong>to</strong>nite<br />
In Cretaceous<br />
Shales, Arctic Is<br />
Biostratigraphy:<br />
relative ages from the ranges of<br />
fossils. A method based on<br />
evolutionary changes in species<br />
(good for all of the Phanerozoic)<br />
Radiometric dating:<br />
“Absolute” ages of<br />
ben<strong>to</strong>nites and tephras based on<br />
K/Ar or Ar/Ar ages<br />
(Good for all of geologic time)<br />
Magne<strong>to</strong>stratigraphy:<br />
Based on correlating magnetic reversals<br />
To a standard record.<br />
(Good for the post mid-Jurassic)
Change language