The Origin of Gumbotil

George F. Kay and J. Newton Pearce
The Journal of Geology
Vol. 28, No. 2 (Feb. - Mar., 1920), pp. 89-125
Stable URL: http://www.jstor.org/stable/30061906
Page Count: 37
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The Origin of Gumbotil
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Notes and References

This item contains 25 references.

[Footnotes]
  • 1
    George F. Kay, "Gumbotil, a New Term in Pleistocene Geology," Science, New Series, Vol. XLIV, November 3, 1916.
  • 2
    W J McGee, "The Pleistocene History of Northeastern Iowa," U.S. Geol. Surv., Eleventh Ann. Rept., Part I (1891), p. 509.
  • 3
    Frank Leverett, "The Illinois Glacial Lobe," U.S. Geol. Surv., Monograph XXXVIII (1899), pp. 28-33.
  • 4
    H. F. Bain, "Geology of Decatur County, Iowa," Iowa Geol. Surv., Vol. VIII (1897), p. 292.
  • 5
    H. F. Bain, "Geology of Keokuk County, Iowa," Iowa Geol. Surv., Vol. IV (1894), p. 302.
  • 1
    H. F. Bain, "Geology of Appanoose County, Iowa," Iowa Geol. Surv., Vol. V (1895), pp. 407-8.
  • 2
    Frank Leverett, "On the Significance of the White Clays of the Ohio Region," American Geologist, Vol. X (1892), pp. 18-24.
  • 3
    H. F. Bain and J. L. Tilton, "Geology of Madison County, Iowa," Iowa Geol. Surv., Vol. VII (1896), p. 523.
  • 4
    J. A. Udden, "Geology of Pottawattamie County, Iowa," Iowa Geol. Surv., Vol. XI (1900), p. 258.
  • 5
    J. L. Tilton, "A Pleistocene Section from Des Moines South to Allerton," Iowa Acad. of Science, Vol. XX (1913), pp. 218-20.
  • 6
    M. F. Arey, "Geology of Davis County," Iowa Geol. Surv., Vol. XX (1909), p. 51.
  • 1
    B. Shimek, "Aftonian Sands and Gravels in Western Iowa," Bull., Geol. Soc. Amer., Vol. XX (1910), p. 405.
  • 2
    B. Shimek, "Geology of Harrison and Monona Counties," Iowa Geol. Bull., Vol. XX (1909), pp. 371-75.
  • 3
    W. C. Alden and M. M. Leighton, "The Iowan Drift," Iowa Geol. Surv., Vol. XXVI (1915), p. 91.
  • 1
    This reference contains 2 citations:
    • George F. Kay, "Some Features of the Kansan Drift in Southern Iowa," Bull., Geol. Soc. Amer., Vol. XXVII, pp. 115-17
    • Iowa Geol. Surv., Vol. XXV, pp. 612-15
  • 1
    George F. Kay, "Pleistocene Deposits between Manilla in Crawford County and Coon Rapids in Carroll County, Iowa," Iowa Geol. Surv., Vol. XXVI (1917), pp. 215-31.
  • 2
    W. C. Alden and M. M. Leighton, "The Iowan Drift, a Review of the Evidences of the Iowan Stage of Glaciation," Iowa Geol. Surv., Vol. XXVI (1917), PP. 92-109.
  • 1
    George F. Kay, "Pleistocene Deposits between Manilla in Crawford County and Coon Rapids in Carroll County, Iowa," Iowa Geol. Surv., Vol. XXVI (1917), p. 225.
  • 1
    Hildebrand, "The Analysis of Silicate and Carbonate Rocks," U.S. Geol. Surv., Bulletin 422.
  • 1
    Cameron, Jour. Phys. Chem., Vol. XIV (1910), p. 340.
  • 2
    Merrill's Rock Weathering and Soils, p. 368
  • 1
    Cameron and Bell, "The Mineral Constituents of Soil Solution," U.S. Dept. of Agric., Bull. 30 (1905), p. 22.
  • 1
    Julien, "On the Geological Action of the Humic Acids," Proc. Amer. Assoc. Adv. Sci. (1879), PP. 311-410.
  • 1
    L. B. Miller, The Colloidal Properties of Clays.
  • 1
    E. W. Shaw, "Characteristics of the Upper Part of the Till of Southern Illinois and Elsewhere," Abstract, Bull. Geol. Soc. Amer., Vol. XXIX (1918), p. 76.