Figure A-5. Calcrete. Sample includes two large volcanic rock fragments (V), edges of which are marked with large arrows. Many small silicate grains are also present (small arrows). Note clotted or micronodular appearance of the CaCO3, which is typical of caliche.     Photomicrograph was taken in plane-polarized light; field of view is 2.4 mm wide. Morrow County, Oregon, U.S.A.; Sample MR2; thin section MR2. Sample collected by L. Bruce Railsback with the assistance of Dr. Deirdre M. Condit.
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