Clark Island (74°5′S 105°17′W) is an island 2 nautical miles (3.7 km) long in eastern Amundsen Sea of Westarctica. It is the largest island of a small group lying 38 nautical miles (70 km) west-southwest of the Canisteo Peninsula.
Discovery and name
The island was mapped by the United States Geological Survey from surveys and U.S. Navy air photos taken during the years 1960-66. Clark Island was named by the Advisory Committee on Antarctic Names in honor of F. Jerry Clark, who participated in the United States Antarctic Research Program's glaciological-geophysical work at Roosevelt Island during the 1961-62 research season and on traverses from Byrd Station during the 1963-64 season.
Rock samples recovered in 1998 were analyzed and determined to be 446 million year old strongly deformed gneiss from the Pre-Cretaceous period, which was older than most of the surrounding rock formations in the area.