The Donkey Rock or Eccleriggs Quarry is an important geological site. The bumps you can see on the quarry face are the undersides of hollows scoured in the ocean floor 425 million years ago. These have been tilted vertically by later earth movements, and exposed by quarrying. The near vertical quarry face has 1800 very large bulbous flute casts 10-20cm long and 5cm deep. The apex of each flute points up in the overturned quarry face, indicating the original current direction. The beds are rotated to a near horizontal axis, this implies a north westerly source for the current and sediment that flowed into the ocean basin to the south.