THE LOCUST GROVE ESKER, OHIO^ 
James D. Thompson, Jr. 
Among the many forms which glacial deposits assume one of 
the most striking and interesting is the esker. The winding ridges 
of glacial origin have long been recognized as distinct features; 
the term esker’’ was applied to them by the geologists of Ireland 
who noted their occurrence in that country in large numbers. 
The term ^^asar” is of Swedish origin and was applied to the same 
formations as found upon the Scandinavian peninsula. 
Among the geologists who did pioneer work on the subject of 
eskers in this country are such men as N. H. Winchell, I. C. 
Russel, Warren Upham, G. H. Stone, W. B. Crosby, T. C. Cham- 
berlin, and W. M. Davis. Chamberlin and Davis made especi- 
ally important contributions bearing on the formation of eskers. 
Mr. D. Hummel- of the Geological Survey of Sweden first suggested 
the theory that eskers had been formed by sub-glacial stream 
action. After no little controversy this theory has been generally 
accepted. 
Other Ohio Eskers. Leverett in Alonograph XLI of the U. S. 
Geological Survey describes eleven eskers as follows: (1) The 
Circleville Esker, Pickaway County, p. 429-431; (2) An esker 
in Fairfield Township, Huron County, p. 597; (3) The Hartland 
Esker, Huron County, pp. 615-617; (4) The Leesville Esker, 
Crawford County, p. 542; (5) An esker near Norwalk, Huron 
County, pp. 587-588; (6) The Pickerington Esker, Fairfield 
County, pp. 428-429; (7) The Radnor Esker, Delaware and 
Marion Counties, pp. 540-541; (8) The Richland Esker, Logan 
County, pp. 489-490; (9) The Richwood Esker, Union County, p. 
540; (10) An esker near Springboro, Warren County, pp. 532-533; 
(11) The Taylor Creek Esker, Hardin County, pp. 538^540. , 
Scheffel has described a group of eskers south of Dayton,"^ and 
Morse one at Columbus. ^ 
^ Work done in a course in Geology, under the direction of Prof. Frank Carney. 
“ Janies Geikie, The Great Ice Age, p. 170. 
Scheffel, Ohio Naturalist, vol. viii, 1908. 
^ W. C. Morse, Ohio Naturalist, vol. vii, 1907, pp. 53-72. 
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