Southwestern Virginia Case Study

Unicoi 3 Conglomerate

Elizabeth A. Johnson

Outcrop and Hand Sample Photos and Videos

Click on the image to enlarge.

There are at least two conglomerate beds in this outcrop.  These images show the conglomerate with the larger (cm-sized) clast size.

The videos below show both the larger and smaller clast sizes.

Thin Section Photos and Videos

Click on the image to make it larger. 1st = plane polarized light; 2nd = cross-polarized light.

The thin section images are from the smaller clast size conglomerate.  This close-up shows clasts of quartzite (top), k-feldspar/granite (bottom right), and shale (bottom left).  There are also volcanic clasts in these rocks.  The volcanics are from the Mount Rogers complex – remember this from the history of magmatism in VA?

 

Entire thin section scan. 1st = ppl; 2nd = xpl. Click on the image to make it larger.

The shale clast is on the left – it’s the darker clast.  Other rounded clasts can be seen in ppl and xpl.

 

Media Attributions

  • Unicoi 3 Conglomerate
  • Unicoi 3 Conglomerate 2
  • Unicoi3 ppl 4x
  • Unicoi3 xpl 4x
  • Unicoi 3 ppl
  • Unicoi 3 xpl

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Introduction to Petrology by Elizabeth A. Johnson is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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