View of the taller hill of “Fossil Mountain” from the top of the smaller hill. The hills are remnants left on the fringe of one of the former quarries that are spread over the nature reserve.
They are the remains of a coral reef which grew when the land which one day would form the Black Country lay under a shallow tropical sea.
The hills are extraordinarily rich in fossils, which are best found by looking in the erosion debris below them.