Sidmouth to Beer Coast

Sidmouth, Devon
Photo supplied by Sarah Firth, Devon County

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Between Sidmouth and Beer the geology is strongly influenced by a gentle easterly dip in the layers of the rocks that are present. The result is that as you travel east the visible rocks change from those of the Triassic Period (230 million years) to the more recent Cretaceous (70 million years ago). This reflects the unique ‘walk through time’ that can be experienced along the length of the Jurassic Coast World Heritage Site, of which this is a part.

Just east of Sidmouth are the Triassic Mercia Mudstones and these bring a distinctive red colour to the rocks. They were deposited in temporary lakes and rivers in a desert environment. These mudstones are then capped with yellow Upper Greensand and white Chalk (this from the younger Cretaceous Period; ‘Creta’ is Latin for ‘chalk’). Both these rocks were laid down in a marine environment, the chalk mainly consisting of the skeletons and shells of countless numbers of organisms, most of them microscopic. As you move towards Beer the easterly dip increasingly brings the pale sands of the Upper Greensand and its overlying Chalk down to beach level and by Beer Head the entire cliff is taken up by these Cretaceous rocks.

All things being equal, you could expect to see Jurassic rocks lying above the older Triassic material and below the younger Cretaceous deposits. The Jurassic Period began about 205 million years ago. However, you will notice no reference above to Jurassic rocks between the Triassic mudstones and the Greensand and Chalk of the Cretaceous Period – they are missing from the site and have been eroded away. This kind of break in the geological story is known as an unconformity.

There are car parks, toilets, restaurants, shops and pubs in Sidmouth, Branscombe and Beer.

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Opening Times

Sidmouth to Beer Coast (1 Jan 2024 - 31 Dec 2024)

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