Figure F31. X-ray diffractogram traces of samples from lithologic Units IV and V. Cc = calcite; Qz = quartz; Hal = halite; Sme = smectite; Clay = nonbasal clay mineral reflection; and Fsp = feldspar. Samples are from background carbonate sediments. Diffractograms from the other major lithology of Unit IV, which is chert and porcelanite, are not shown here. Note that individual diffractograms are offset vertically for clarity.