Plate 32. 



Fig. 1. Thin section of an oolite grain from tlie Baliamas, X 100. 



2. Oolite grains in mud from the west side of Audros Island, Bahamas, X 30. 



3. Aragonite needles in mud from the west side of Andros Island, Bahamas, 



X 840. 



4. Thin section of oolite grains from Great Salt Lake, X 100. 



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