Grey Downtonian
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The Grey Downtonian facies occurs in the Downton Castle Sandstone Group[2] of the British Old Red Sandstone, and more or less straddles the Devonian-Silurian boundary.[3] The Ludlow Bone Bed and Temeside Shales are sometimes also included in the Grey Downtonian, which is also referred to as the Temeside group, part of the Downton Series.[4] It is intermediate between the marine flagstones beneath it and the terrestrial deposits above it.[5] The beds were deposited in a marine environment, with some material being washed in from the nearby land.[1]