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][2] In 1952 he moved to Johns Hopkins University where he remained until retirement in 1973.
He received the Penrose Medal from the Geological Society of America in 1975.
[1] Francis J. Pettijohn medal from Society For Sedimentary Geology in 1992