Add to ORKGIn the third annual report of the Iowa Geological Survey Dr. C. R. Keyes has treated, at considerable length, of the glacial scorings in Iowa. Among others, several localities were given from Des Moines County, of which two were described somewhat in detail by the present writer. Since the above mentioned article was prepared a somewhat more extended and minute search has been made, with the result that several other localities showing glacial scratches have been discovered. Also, some attention has been given to a study of the phenomena accompanying these markings, with a view of determining the general direction and sequence of the ice streams. It is scarcely to be doubted, from the great variation in the direction of striae, that the ice...
