176 FULLER AND CLAPP — MARL-LOESS OF LOWER WABASH VALLEY 



Boulders and Pebbles in Loess 



Papers 10, 11, 12, 19, and 23 of the preceding lists also contain allu- 

 sions to the occurrence of pebbles or boulders in loess. Additional ref- 

 erences are as follows : 



25. Bain, H. F. : Geology of Carroll county (Iowa). Iowa Geological Survey, vol- 



ume 9, 1898, pages 51-107. 



26. Mabry, T. O. : The brown or yellow loam of northern Mississippi and its re- 



lation to the northern drift. Journal of Geology, volume 6, 1898, pages 

 273-302. 



27. Shimek, B. : Additional observations on the surface deposits in Iowa. Iowa 



Academy of Sciences, Proceedings, volume 4, 1896, pages 68-72. 



28. Udden, J. A, : Geology of Pottawattamie count}^ (Iowa). Iowa Geological 



Survey, volume 11, 1900, pages 197-277. 



Loess Plains and T'erraces, uniform upper limits, etcetera 



See papers 1, 4, 6, 11, 15, and 21 for reference to loess plains, terraces, 



etcetera, in addition to the following: 



29. Call, R. E. : The loess in central Iowa. American Xaturalist, volume 15, 1881, 



pages 782-784. 



30. Hayden, F, V. : United States Geological Survey of Wyoming and Contiguous 



Territories, 1870. Discusses loess on pages 98 and 99. 



31. Hershey, 0. H. : Loess formation of the Mississippi river. Science, new series, 



volume 5, 1897, pages 768-770. 



32. Todd, J. E. : Pleistocene problems in America, Geological Society of America 



Bulletin, volume 5, 1894, pages 531-548 



33. White, C. A. : Iowa Geological Survey, volume 1, 1870. 



Valley Silts of the Marl-loess Type 

 See papers 21 and 23 and also the following: 



34. Savage, T. E. : Geology of Henry county (Iowa). Iowa Geological Survey, 



volume 12, 1901, pages 237-302. 



35. Udden, J. A. : Geology of Jefferson county (Iowa). Iowa Geological Survey, 



volume 12, 1901, pages, 355^38. 



