Richard Alexander Fullerton Penrose, Jr.

Richard Alexander Fullerton Penrose, Jr. (born Dec. 17, 1863, Philadelphia—died July 31, 1931, Philadelphia) was a geologist known for his explorations for manganese and iron-ore deposits. He was a member of the Arkansas Geological Survey from 1889 until 1892, when he became a faculty member at the University of Chicago. From 1917 until 1923 he served on the National Research Council, Washington, D.C. He wrote The Nature and Origin of Deposits of Phosphate of Lime...