FIG. 18.

Plain light (left) and crossed-polarized light (right) images of magnified areas of thin section of sample 14 obtained with a Nikon Eclipse E600 polarizing microscope targeting main elements with matrix components labeled. These include clasts (A and B) and matrix cements (C and D). (E and F) are close-ups of (C and D) to show the cross-cutting relationships of the cements to the clasts in better detail. The crossed-polarized images are slightly overexposed to bring out color variations between the dark Fe-bearing cements. Color images available online at www.liebertonline.com/ast