Aston Limestone
Middle Jurassic (Bajocian)
PERIOD |
GROUP |
FORMATION |
Jurassic |
Inferior Oolite |
Aston Limestone |
Lithology
Grey and brown variously shelly, ooidal, sandy, shell-detrital and bioturbated limestones; rubbly in parts, with sandy and shell-detrital marl beds. Component members: Lower Trigonia Grit, Gryphite Grit, Notgrove, Rolling Bank.
Upper Boundary
Disconformity: hardground: limestone as in lithological description, overlain by Salperton Limestone Formation.
Lower Boundary
Disconformity: upward change from ooidal and peloidal limestone (Scottsquar Member) or sand, mudstone and sandy limestone (Harford Member) into limestone as in lithological description. Generally marked by a hardground.
Representative Sites
Rolling Bank Quarry (Rolling Bank Member)
Notgrove Railway Cutting
Chedworth Railway Cutting
Harford Railway Cutting
Brownstone Quarry
Information on lithology and boundaries taken from the British Geological Survey Lexicon of Named Rock Units |
