Abstract Thomas Chrowder Chamberlin (1843-1928), class of 1866, was a professor of science at Beloit College from 1873-1886. Though his academic interests were wide-ranging, he is best known for the Chamberlin-Moulton Planetesimal Hypothesis, a theory of solar system formation. His son, Rollin Thomas Chamberlin also was an accomplished geologist, and together they embarked on a survey trip to China in 1909 for the Oriental Educational Investigation Commission. The Chamberlins' papers include...