People Who Contributed to this Project

Leslie B. Magoon Geologist U.S. Geological Survey Menlo Park, California	Susan F. Hodgson Writer and Historian California Dep't of Conservation Sacramento, California	Thomas D. Lorenson Organic Geochemist U.S. Geological Survey Menlo Park, California	Richard G. Stanley Geologist U.S. Geological Survey Menlo Park, California
Paul G. Lillis Petroleum Geochemist U.S. Geological Survey Lakewood, Colorado	Lee Davisson Organic Geochemist Lawrence Livermore National Laboratories Livermore, California	Robert J. McLaughlin Geologist U.S. Geological Survey Menlo Park, California	Michael B. Underwood Geology Professor University of Missouri Columbia, Missouri

At Work in the Field

	Les Magoon samples some Cretaceous limestone that may be the source of oil found in the New Almaden Mine area, near San Jose, California.
	Tom Lorenson collects a gas sample from the Vichy Spring seep in northern California.
	Paul Lillis captures some oil from a well in the Petrolia Field, the first oil field discovered in California.

Not pictured:

• Florence Wong, Geologist, Geographic Information Specialist, U.S. Geological Survey, Menlo Park, California
• Zenon Valin, Geographic Information Specialist, U.S. Geological Survey, Menlo Park, California
• Frances Cole, Geologist and Science Writer, formerly at U.S. Geological Survey, Menlo Park, California
• Laura Zink Torresan, IT Specialist, Web Site Design and Maintenance, U.S. Geological Survey, Santa Cruz, California