Authigenic feldspars in sediments have been reported by a number of workers from many geologic horizons, but the opinion prevails that such feldspars are relatively uncommon. Most investigators have concluded that the authigenic growths occurred during the deposition or early consolidation of the containing sediments. The authors have studied a large number of thin sections and insoluble residues and conclude that authigenic feldspars occur in many types or rocks from Cambrian to Cretaceous in age, and that in certain instances the evidence indicates that growth occurred after consolidation of the rock and during a period of replacement by meteoric waters. Feldspars are common in limestone and dolomite, and in some arenaceous beds the feldspar is known to constitute about 30 per cent of the fine grades.

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