Linn Hoover, 61, deputy for international science programs at the U.S. Geological Survey's Office of International Geology, died Feb. 8 of a heart attack while on an airplane at Orly Field in Paris. Dr. Hoover, a resident of Chevy Chase, was en route to Morocco for a meeting of the International Union of Geological Scientists when he was stricken.

Dr. Hoover was born in Baltimore, graduated from the University of North Carolina and earned a doctorate in geology from the University of California at Berkeley. During World War II he served in the Army in Europe.

After doing field research in the Pacific Northwest, Dr. Hoover came to Washington to work for the Geological Survey in 1958. He was director of the Earth Sciences Division of the National Academy of Sciences, then executive director of the American Geological Institute, and in 1974 he returned to the U.S. Geological Survey as deputy chief of the Office of Energy Resources and Marine Geology.

He was general secretary for the International Geological Congress that is to be held in 1989, and he was vice president of the Commission for the Geological Map of the World.

Dr. Hoover was also a recipient of the Ben H. Parker Memorial Medal, which is given by the American Institute of Professional Geologists; a member of the board of directors of the Cosmos Club, vice president of the Geological Society of Washington and a member of the American Association of Petroleum Geologists, the American Association for the Advancement of Science and the Geological Society of America.

Dr. Hoover is survived by his wife, Joan Williams Hoover of Chevy Chase; a son, Peter Linn of San Jose, a daughter, Hilary Joan Hoover of Austin, Tex., a brother, David, of Chevy Chase, and one grandchild.