Johan August Udden

Johan August Udden (1859–1932) was a Swedish-American geologist and academic. He held the rank of Professor at Augustana College (1888–1911) before joining the University of Texas (UT) in 1911 as Geologist and later Director of the Bureau of Economic Geology (1915–1932). He was affiliated with the Department of Geology but focused on research rather than teaching.

Education:

• Bachelor’s, Augustana College, 1881
• MA, Augustana College, 1889
• PhD (honorary), Augustana College, 1900
• Multiple honorary doctorates from Bethany College, Texas Christian University, and Augustana College

Research Interests: Udden pioneered studies in sedimentary processes, grain-size classification, and subsurface geology. He developed the geometric grain-size scale still used today. His work included investigations of loess deposits, fossil ice crystals, and potash reserves in the Permian Basin. He also contributed to hydrogeology through detailed studies of groundwater systems in Illinois.

Awards & Affiliations:

• Fellow of the American Association for the Advancement of Science (1906)
• 1929 Honorary Member of the Society of Economic Paleontologists and Mineralogists
• Knighthood by King Gustav V of Sweden (1911)
• Member of the Geological Society of America and American Association of Petroleum Geologists

Legacy: Udden’s theoretical insights guided oil exploration in Texas and established foundational methodologies in sedimentology. He authored 46 papers and pioneered subsurface geology laboratory techniques.