Ee eee * 7 
‘ 
E. W. Hilgard— Geological History of the Gulf of Mexico. 397 
_ only in the lower, clayey division of the series; and it is suffi- 
ciently remarkable that the fine sand- and clay-stones of the 
* This Jour., Jan., 1869, p. 81; Ibid, Nov., 1869, p. 338. 
