. Bulletin of the Geological Society of America. Geology. 356 HALL AND SARDKSON—EOLIAN DEPOSITS OF MINNESOTA The GroAV dunes mentioned ))y U])ham^ are in all prohaVjility simply occurrences in the same ridge or series of ridges skirting the Mississippi valley along its northeast side—that is, where the prevailing west and southwest winds would deposit their load of sand and dust picked up from the river and its numerous sand liats. The mounds of sand which can be followed still farther northwestward than the district around Princeton are believed to belong to the same belt and oAve their origi
. Bulletin of the Geological Society of America. Geology. 356 HALL AND SARDKSON—EOLIAN DEPOSITS OF MINNESOTA The GroAV dunes mentioned ))y U])ham^ are in all prohaVjility simply occurrences in the same ridge or series of ridges skirting the Mississippi valley along its northeast side—that is, where the prevailing west and southwest winds would deposit their load of sand and dust picked up from the river and its numerous sand liats. The mounds of sand which can be followed still farther northwestward than the district around Princeton are believed to belong to the same belt and oAve their origin to the same causes. They extend as far north as Brainerd, 60 miles farther from Minneapolis than is Princeton. SAINT ANTHONY HILL AND THE UNIVERSITY CAMPUS The old Saint Anthony hill, once a landmark standing over Saint An- thony falls, now nearly leveled in the grading of the city, consists of a sand dune 10 to 12 feet high built upon a mound of glacial debris. The 1. FiGUEE 1.—Section of Glacial and post-Glacial Deposits. The locality is the railroad cut south of the University campus. Number 1 is regarded as dune sand bearing soil 5 feet in thickness ; 2, gravel with lag gravel in the top; 3, 4, and 5, various phases of the Glacial drift. After N. H. Winchell. height of its summit above the Mississippi river at the crest of the falls must have been at least 50 feet. During the past year excavations have been made which have exhibited in striking profiles sections of this great thickness of dune sand. * Warren Upham : Modified drift in Saint Paul, Minnesota. 19C. Bull. Geol. See. Am., vol. 8, pp. 183-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Geological Society of America. [New York : The Society]
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