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In page Devon:

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The sedimentary rocks in more eastern parts of the county include Permian and Triassic sandstones (giving rise to east Devon's well known fertile red soils); Bunter pebble beds around Budleigh Salterton and Woodbury Common and Jurassic rocks in the easternmost parts of Devon. Smaller outcrops of younger rocks also exist, such as Cretaceous chalk cliffs at Beer Head and gravels on Haldon, plus Eocene and Oligocene ball clay and lignite deposits in the Bovey Basin, formed around 50 million years ago under tropical forest conditions.