J. A. Udden
J.A. Udden taught geology at Augustana College from 1888 to 1911. Udden was an accomplished researcher in fields of sedimentology and stratigraphy. He pioneered studies of wind-blown sediment, and he is well-known for his development of a grain-size scale, which today is known today as the Udden-Wentworth scale. Udden was one of the first geologists to demonstrate that Pleistocene loess in the Upper Mississippi Valley was transported and deposited by wind, rather than water. Udden published numerous papers on the geology of the Rock Island area, and his interest in the wind led him to build an early working model of a flying machine.
For more information about J.A. Udden, refer to:
Hansen, W.B., 1985, Dust in the wind: J.A. Udden's turn-of-the-century research at Augustana, in Drake, E.T. and Jordan, W.M., Geologists and Ideas: A History of North American Geology: G.S.A. Centennial Special Volume 1, p. 302-214.