It is 2.35 kilometres (1.5 mi) in diameter and the age is estimated to be 550 ± 100 million years (Ediacaran or Cambrian).

[1] Holleford Crater was discovered in the 1950s during analysis of aerial photographs under the direction of Carlyle S. Beals of the Dominion Observatory in Ottawa.

The studies concluded that an ancient meteorite impact crater is present in the Precambrian bedrock below the surface.

(It was the birthplace of the last surviving veteran of the Canadian army in World War One, Jack Babcock, who died on February 18, 2010, at the age of 109.

Queen's University's Miller Hall Museum of Geology maintains a display dedicated to the Holleford Meteorite Crater.