The analyses reported in this open-file report are on samples collected in April 1976 by John P. D'Agostino, George E. Ericksen, Frank G. Lesure, Robert W. Luce, Paul L. Weis, and Jesse W. Whitlow, assisted by Andrew E. Grosz and J. Thomas Hanley, and on a few samples collected in November 1976, by Whitlow and Grosz. Location of samples and discussion of the results are given by Lesure and Whitlow (1977).