Only a weathered circular ridge is still visible at the surface.

The shell is thin but quite deep, with circular closely packed growth ridges.

The outer rim is a low, circular ridge with a narrow break to the south and a wider breach to the northeast.

Taking center stage and lying on its side is a section of black metal tubing with circular ridges.

The worn rim forms a low, circular ridge around the somewhat bowl-shaped interior.

The outer rim is an irregular circular ridge that surrounds the interior floor.

The remains of a circular ridge of the well can still be seen in the park today.

Once there were human settlements all along the northern faces of the circular ridges.

The first sign of the circle was a 1991 aerial survey photograph that showed circular ridges under a wheat field.

Arnold is surrounded by a circular ridge from the north-west around to the south-east,and raised ground to the west.