BIBLIOGRAPHY 175 



5. Hayden, F. V. : First Annual Keport of the United States Geological Survey 



of the Territories, 1867. Loess is discussed on pages 10, 12, 18, and 19. 



6. Hershey, O. H. : Upland loess of Missouri ; its mode of formation. American 



Geologist, volume 25, 1900, pages 369-374. 



7. Hilgard, E. W. : The loess of the Mississippi valley and the eolian hypothesis. 



American Journal of Science, third series, volume 18, 1879, pages 106-112. 



8. Leonard, A. G. : Geology of Dallas county (Iowa). Iowa Geological Survey, 



volume 8, 1897, pages 51-118. 



9. Leverett, Frank : On the significance of the white clays of the Ohio region. 



American Geologist, volume 10, 1892, pages 18-24. 



10. Leverett, Frank : The Illinois glacial lobe. United States Geological Survey, 



monograph 38, 1899, pages 156-184. A diflferentiation of the loess was made 

 by Leverett in an earlier report. Report of Illinois Board of AVorld's Fair 

 Commissioners, 1895, pages 77-92. 



11. McGee, W J: The Pleistocene history of northeastern Iowa. United States 



Geological Survey, Eleventh Annual Report, 1890, part i, pages 199-577. 



12. Norton, W. H. : Geology of Scott county (Iowa). Iowa Geological Survey, 



volume 9, 1898, pages 389-519. 



13. Saflford, Jas. M. : Geology of Tennessee, Nashville, 1869. Loess is discussed on 



pages 114, 433, and 434. 



14. ^himek, B. : A theory of the loess. Iowa Academy of Sciences, Proceedings, 



volume 3, 1895, pages 82-89. 



15. Todd, J. E. : Degradation of the loess. Iowa Academy of Sciences, Proceed- 



ings, volume 5, 1897, pages 46-51. 



16. Todd, J. E. : On the annual deposit of the Missouri river daring the Post- 



Pliocene. American Association for the Advancement of Science, Proceed- 

 ings, volume 26, 1877, pages 287-291. 



17. Todd, J. E. : The moraines of southeastern South Dakota and the attendant 



deposits. United States Geological Survey, Bulletin 158, 1899. 



18. Wilder, F. A. : Geology of Lyon and Sioux counties (Iowa). Iowa Geological 



Survey, volume 10, 1899, pages 81-155. 



19. Witter, F. M. ; Some additional observations on the loess in and about Musca- 



tine (Iowa). Iowa Academy of Sciences, Proceedings, 1887-1889, page 45. 



20. Whitney, Milton : Examination of soils from Illinois. Report of Illinois Board 



of World's Fair Commissioners, 1895, pages 93-114. 



Intersiratified Sands and Gravels 



Papers 1, 2, 3, 7, 9, 10, 11, and 12 in the list of references on stratifica- 

 tion also contain allusions to interstratified sands and gravels. Among 

 other papers referring to the same features are the following : 



21. Calvin, Samuel : Geology of Delaware county (Iowa). Iowa Geological Survey, 



volume 8, 1897, pages 118-199. 



22. Calvin, Samuel: Geology of Page county (Iowa). Iowa Geological Survey, 



volume 11, 1900, pages 397-460. 



23. Norton, W. H. : Geology of Cedar county (Iowa). Iowa Geological Survey, 



volume 11, 1900, pages 279-396. 



24. Udden, J. A. : Geology of Muscatine county (Iowa). Iowa Geological Survey, 



volume 9, 1898, pages 247-380. 



