It passes Smoot Rock, Frost Cliff and Mount Steinfeld, which lie to the north.

West of Mount Steinfeld it is joined from the right by Kirkpatrick Glacier, which flows down from Strawn Pass to the south of McDonald Heights.

It passes Miller Spur on the southeast and enters Hull Bay just east of Lynch Point.

An isolated rock lying eastward of the head of Hull Glacier, about 7 nautical miles (13 km; 8.1 mi) east-southeast of Mount Steinfeld.

Named by US-ACAN for Commander William L. Frost, United States Navy, Officer-in-Charge of Antarctic Support Activities at McMurdo Station, 1970.

Named by US-ACAN for Captain Ervin B. Rubey, United States Navy, Commander of Antarctic Support Activities at McMurdo Station, summer 1969-70.