St Maughan's
Early Devonian (Lochkovian)
PERIOD |
GROUP |
FORMATION |
Devonian |
Old Red Sandstone |
St. Maughan's |
Lithology
Interbedded purple, brown and green sandstones and red mudstones with intraformational conglomerates containing calcrete clasts.
Upper Boundary
At base of Brownstones, where sandstone-dominated sequences begin. .
Lower Boundary
Placed at top of Bishop's Frome ('Psammosteus') Limestone Member of the Raglan Mudstone Formation.
Representative Sites
No Accessible SItes
(M50 Motorway cuttings provide best exposures)
Information on lithology and boundaries taken from the British Geological Survey Lexicon of Named Rock Units
and BGS Memoirs.
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