The mineralogy of clay size bottom sediment was studied in the main channel and adjacent fiords in Glacier Bay, Alaska to determine if a lateral change in clay composition occurs as sediment is carried from, a fresh water to marine environment. X-ray analysis, indicates a dominance of chlorite and trioctahedral mica which does not change in composition or abundance laterally. The lack of diagenetic formation of new minerals probably is due to the rapid rate of clay sedimentation and also due to the minor amount of chemical degraduation at the source in this sub-arctic environment.

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