Prahl Crags are a group of rock crags at an elevation of 2,750 m on the south slopes of the Mount Moulton

Mount Moulton

Mount Moulton is a broad, ice-covered shield volcano standing 16 km E of Mount Berlin in the Flood Range, Marie Byrd Land.Discovered on aerial flights by the United States Antarctic Service in 1940, and named for Richard S...

 massif

Massif

In geology, a massif is a section of a planet's crust that is demarcated by faults or flexures. In the movement of the crust, a massif tends to retain its internal structure while being displaced as a whole...

, in Marie Byrd Land

Marie Byrd Land

Marie Byrd Land is the portion of West Antarctica lying east of the Ross Ice Shelf and the Ross Sea and south of the Pacific Ocean, extending eastward approximately to a line between the head of the Ross Ice Shelf and Eights Coast. It stretches between 158°W and 103°24'W...

. Mapped by United States Geological Survey

United States Geological Survey

The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology,...

 (USGS) from ground surveys and U.S. Navy air photos, 1959-66. Named by Advisory Committee on Antarctic Names

Advisory Committee on Antarctic Names

The Advisory Committee on Antarctic Names is an advisory committee of the United States Board on Geographic Names responsible for recommending names for features in Antarctica...

 (US-ACAN) for Sidney R. Prahl, a member of the United States Antarctic Research Program (USARP) team that studied ice sheet dynamics

Ice sheet dynamics

Ice sheet dynamics describe the motion within large bodies of ice, such those currently on Greenland and Antarctica. Ice motion is dominated by the movement of glaciers, whose gravity-driven activity is controlled by two main variable factors: the temperature and strength of their bases...

 in the area northeast of Byrd Station

Byrd Station

Byrd Station refers to a research station established by the United States during the International Geophysical Year by the U.S. Navy during Operation Deep Freeze II in West Antarctica at 80°, 120°W...

, 1971-72.