Just posting this relative dating diagram I drew up and the associated classroom activity in case it’s useful to some Google-searching instructor out there.


Activity_XCutting_new (docx)

Activity_XCutting_new (pdf)

If you’d like the Adobe Illustrator file of the figure, feel free to contact me.


6 thoughts on “Relative Dating Activity

  1. Combining color and a USGS pattern is easy. I’m giving you instructions for the CS2 version, but sure it’ll work in other versions. Open the Swatches window. Click the small arrow below the close button (upper right corner), click on “Open swatch library”. Select the USGS pattern file you like. Once its open, click a pattern a drag it on the canvas. Ungroup it. There should be a square w/o fill and stroke, select it and change its color (use light colors). Select the new background and everything inside. Go to the Edit menu and click in “Define pattern”. You name it.
    Good luck


    1. A-ha! Thank you!
      I applied patterns to the sandstones and conglomerate, while I was editing the figure. If I could warp the patterns to work for the folded layers (without fiddling for hours), I’d do that, as well.


      1. I don’t think you can adapt the patterns to the folded layers (at least I don’t know how to do that). You could use a structureless pattern (like small points) and then draw some lines following the trace of the folded layers. With the pencil tool you can do that in no time. You can use an independent layer to put them, so you can select them with just a click.


Leave a Comment...

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.