Downton Castle Sandstone
Late Silurian (Pridoli)
PERIOD |
GROUP |
FORMATION |
Silurian |
Devonian |
Old Red Sandstone |
Downton Castle Sandstone |
Lithology
Ludlow Bone Bed Member locally at base; Platyschisma Shale Member (to 2m) above; mainly yellow, fine-grained, micaceous, well-sorted cross-bedded sandstone (Sandstone Member), with siltstone and olive green mudstone.
Upper Boundary
Top of highest sandstone below red mudstones of the Raglan Mudstone Formation.
Lower Boundary
Base of Ludlow Bone Bed Member (if present); sharp junction with underlying Upper Ludlow Shale (Upper Whitcliffe Formation).
Representative Sites
Old Quarry, Clifford's Mesne
Purton Passage
Information on lithology and boundaries taken from the British Geological Survey Lexicon of Named Rock Units
and BGS Memoirs.
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