Thrinaxodon Col is a rock col 2 nautical miles (3.7 km) southeast of Rougier Hill

Rougier Hill

Rougier Hill is an ice-free hill just east of LaPrade Valley in the north part of the Cumulus Hills, overlooking the south side of McGregor Glacier. Named by the Texas Tech Shackleton Glacier Expedition for Michael Rougier, staff photographer with Life Magazine who was seriously injured while...

. The col is along the ridge that trends southward from Rougier Hill in the Cumulus Hills

Cumulus Hills

Cumulus Hills is a several groups of largely barren hills, divided by the Logie Glacier. They are bounded by Shackleton Glacier on the west, McGregor Glacier on the north and Zaneveld Glacier on the south. The exposed rock in this area was observed on a number of occasions to give rise to the...

, Queen Maud Mountains

Queen Maud Mountains

The Queen Maud Mountains are a major group of mountains, ranges and subordinate features of the Transantarctic Mountains, lying between the Beardmore and Reedy Glaciers and including the area from the head of the Ross Ice Shelf to the polar plateau in Antarctica...

. The name was proposed to 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) in 1971 by geologist David H. Elliot of the Ohio State University Institute of Polar Studies. The col is a very important fossil (vertebrate) locality at which several specimens of the mammal-like reptile Thrinaxodon

Thrinaxodon

Thrinaxodon was a cynodont, an ermine-sized therapsid. Pits on the skull suggest that Thrinaxodon may have had whiskers, and by extension a protective covering of fur. There are suggestions that it was warm-blooded...

were found.