X-ray diffractograms for 80 samples indicate that smectite, illite, and kaolinite are the predominant clay minerals in sediments from the Guadalupe Delta and San Antonio Bay with smectite the most abundant. The clay minerals of the area studied are interpreted as being an indicator of clay minerals in the source area based on evidence that they (1) are the same for both Pleistocene and Holocene sediments (2) are not related to changes in depth (3) are not significantly different for fresh water and brackish environments and (4) are essentially the same as those in the source area.

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