BIBLIOGRAPHY 313 



(16) V^ J McGee: The Pleistocene history of uortheasterii Iowa. Eleventh 



Annual Report, United States Geological Survey, 1891, pages 304-308. 



(17) Lawrence Martin: The physical geography of Wisconsin. Wisconsin 



Geological and Natural History Survey, Bulletin 36, 1916, pages 58, 

 63-70. 



(18) EixisoN Orr: A deposit of brown hematite near Waukon, Iowa. Amer- 



ican Geologist, volume 1, 1888, pages 129-130. 



(19) O. H. St. John: Geology of the middle region of western Iowa. Iowa 



Geological Survey, volume 2, 1870, pages 10-12, 99-104, 133-134, 143- 

 145, 149. 



(20) R. D. Salisbury: On the northward and eastward extension of the pre- 



Pleistocene gravels of the Mississippi Basin. Bulletin of the Geolog- 

 ical Society of America, volume 3, 1903, pages 183-186. 



(21) : Pre-Glacial gravels on the quartzite range near Baraboo, Wis- 

 consin. Journal of Geology, volume 3, 1895, pages 655-657. 



(22) F. W. Sardeson : The so-called Cretaceous deposits in southeastern Min- 



nesota. Journal of Geology, volume 6, 1898, pages 679-691. 



(23) E. W. Shaw and A. C. Trowbridge: Geologic atlas of the United States. 



Galena-Elizabeth Folio, number 200, 1916, pages 9-10. 



(24) W. Dj SiiiPTON : The geology of the Sparta Quadrangle, Wisconsin. Un- 



published thesis, University of Iowa, 1916, pages 39-45. 



(25) Moses Strong: Geology of the Mississippi region north of the Wisconsin. 



Geology of Wisconsin, volume 4, 1S82, page 88. 



(26) A. C. Trowbridge : Preliminary report on geological work in the Drift- 



less Area. Bulletin of the Geological Society of America, volume 26, 

 1915, page 76. 



(27) : Preliminary report on geological work in northeastern Iowa. 



Proceedings of the Iowa Academy of Science, volume 21, 1914, pages 

 205-209. 



(28) : History of Devils Lake, Wisconsin. Journal of Geology, volume 



25, 1917, pages 352-353. 



(29) J. A. Udden : Geology and mineral resources of the Peoria Quadrangle, 



Illinois. United States Geological Survey, Bulletin 506, 1912, page 50. 



(30) Warren Upham : Geology of Wright County. Geology of Minnesota, 



volume 2, 1888, page 292. 



(31) N. H. Winchell: Geology of Fillmore County. Geology of Minnesota, 



volume 1, 1884, pages 309-310. 



(32) — : Geology of Goodhue County. Geology of Minnesota, volume 2, 



1888, pages 20-61. 



