He pushed down the other side of the ridge into the ancient crater of the volcano.

Within the ancient crater there is a rich community of species common to the Azores.

Glover Park is an ancient volcanic crater which erupted more than 50,000 years ago.

We can see that the erosion of ancient craters dramatically began to slow about then.

The rover was headed for an ancient crater where a real scientist would take over and do something really scientific.

This feature is an ancient crater that has been subject to considerable modification due to subsequent impacts.

However, the lake is actually the result of glacial erosion, and in no way an ancient volcanic crater.

He saw a line of cliffs and the worn, tired mountains ringing an ancient crater.

It stands in the place of an ancient crater and shows a distinctive semi-circular pattern.

Discontinuous ridges are all that remains of the ancient crater's rim.