L. W. LeRoy was born in Moorpark, Cali- 

 fornia. He received his Geological Engineer- 

 ing degree from the Colorado School of Mines 

 in 1933, and his Doctor of Geological En- 

 gineering from the same school in 1945. His 

 geological experience has been for the most 

 part in exploration with the Standard Oil 

 Company of California in Africa, Indonesia, 

 and South America. He returned to the School 

 of Mines in 1948 and in 1953 was appointed 

 Head of the Department of Geology. He is a 

 member of American Association of Petroleum 

 Geologists, Geological Society of America, The 

 Paleontological Society, The Society of Eco- 

 nomic Paleontologists and Mineralogists, Tau Beta Pi 



*-ii 



J. W. Low, a native of Colorado, graduated 

 in geology from the University of Colorado 

 in 1927. He has had experience as an illus- 

 trator for Carnegie Institute of Washington, 

 mapped the topography of the Canon de Chelly 

 National Monument, and served as a hydrog- 

 rapher for the State of Utah. In 1937 he 

 became affiliated with The California Com- 

 pany, held many responsible positions in their 

 Geological Division, and in 1955 was appoint- 

 ed Research Geologist. Mr. Low is author of 

 Plane Table Mapping and Geologic Field 

 Methods, both texts published by Harper and 

 Brothers. 



872 



