The oolites form on the ground around sand grains by precipitation from the water sprayed over the ammonia-cooling tower at the ice plant in Seymour, Texas. This untreated water is hard, chiefly from calcium and magnesium bicarbonates, and precipitation is largely due to loss of carbon dioxide. The oolites show two distinct concentric zones, in some of which four to nine laminae can be distinguished. No trace of radial structure was noted.

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