The Defant Glacier flows to the north of the eastern tip of the Du Toit Mountains, entering Violante Inlet to the east.

The Maury Glacier flows between the south of the Du Toit Mountains and the Wegener Range to enter Violante Inlet.

Named after Hein E. Wever, British Antarctic Survey (BAS) geologist, member of a joint BAS-USGS field party to the Black Coast, 1986-87.

[4] The range was mapped by USGS from United States Navy aerial photographs taken 1966-69 and was visited by a USGS-BAS joint field party, 1986-87.

Named by US-ACAN after Peter T. Marquis, general assistant, BAS, a member of the joint BAS-USGS party to this area, 1986-87.