Francis J. Pettijohn

Francis John Pettijohn (June 20, 1904 – April 23, 1999) was an American geologist who served for many years on the faculty of Johns Hopkins University.^[1]

Pettijohn received his doctorate from the University of Minnesota in 1923 based on a study of Precambrian sedimentology and structure of an area around Abram Lake, Ontario.^[1] In 1929 he obtained a position at the University of Chicago. He became a full professor there in 1949.^[1] In 1943 he published an important work on Archaean sedimentation.^[1][2] In 1952 he moved to Johns Hopkins University where he remained until retirement in 1973.