The feature is about 30 nautical miles (56 km; 35 mi) long and forms a physical separation between Wilson Hills and Usarp Mountains.

[1] The Pryor Glacier originates in the west between the Wilson Hills and the Usarp Mountains and flows north-northeast to enter Rennick Bay to the north of Yermak Point.

A valley glacier, 17 nautical miles (31 km; 20 mi) long, which flows northeastward through the Usarp Mountains.

Named by US-ACAN for Gordon Robilliard, United States Antarctic Research Program (USARP) biologist at McMurdo Station in 1967-68 and 1968-69.

This area was photographed in 1958 by the Soviet Antarctic Expedition which gave the name "Zaliv Kooperatsiya" to the western portion of Rennick Bay.

[6] This article incorporates public domain material from websites or documents of the United States Geological Survey.