Harrison Nunatak is a snow-covered nunatak

Nunatak

A nunatak is an exposed, often rocky element of a ridge, mountain, or peak not covered with ice or snow within an ice field or glacier. The term is typically used in areas where a permanent ice sheet is present...

, with rock exposure to the SE, located 4 mi S of Savage Glacier

Savage Glacier

Savage Glacier is a glacier at the east end of Thurston Island, lying south of Tierney Peninsula and flowing east to Seraph Bay. Discovered on helicopter flights from the USS Glacier and Burton Island by personnel of the U.S. Navy Bellingshausen Sea Expedition in February 1960. Named by Advisory...

 in the extreme SE part of Thurston Island

Thurston Island

Thurston Island is an ice-covered, glacially dissected island, long, wide and in area, lying a short way off the NW end of Ellsworth Land, Antarctica. It is the third largest island of Antarctica, after Alexander Island and Berkner Island...

. Discovered on helicopter flights from the USS Bellinghausen Sea Expedition in February 1960. Named by Advisory Committee on Antarctic Names (US-ACAN) for Henry T. Harrison, Jr., U.S. Weather Bureau meteorologist with the Byrd Antarctic Expedition (ByrdAE) in 1928-30.