London Bridge, Torquay
This spectacular limestone Arch in Torquay, a seaside town in Devon, England was created over a long period of time by wave action. The outer seaward limestones are thick-bedded and more resistant than the limestones which form the natural bridge. The roof of the arch is formed by thin-bedded layers which have been eroded at the base but have survived high above the sea level where the pounding waves have not yet carried them down.
The limestones date from the Devonian period (416 to 345 million years ago). These sedimentary rocks predominately consist of the mineral calcium carbonate which originates from various sea creatures. The rocks contain a huge amount of fossils which can be discovered everywhere in the Devonian limestone. After their deposition the formation has been tilted. Within the arch structure the layers dip very steeply at about 80 degrees.