[1] The Cordiner Peaks were discovered and photographed on January 13, 1956, in the course of a transcontinental nonstop plane flight by personnel of United States Navy Operation Deep Freeze I from McMurdo Sound to the Weddell Sea and return.

Named by US-ACAN for Lieutenant Conrad J. Jaburg, United States Navy, helicopter pilot, Ellsworth Station winter party, 1957.

A rock ridge, 4 nautical miles (7.4 km; 4.6 mi) long, marking the north limit of the Cordiner Peaks.

William H. Sumrall, United States Navy Reserve, airplane pilot, Ellsworth Station winter party, 1957.

Named by US-ACAN for Allen M. Jackson, aviation electronics technician, Ellsworth Station winter party, 1957.