The BGS Lexicon of Named Rock Units — Result Details

Ashbourne Gravel

Computer Code: ASGR Preferred Map Code: notEntered
Status Code: Index Level
Age range: Wolstonian Stage (QO) — Wolstonian Stage (QO)
Lithological Description: Coarse gravel, hard and with a calcite cement,with abundant pebbles and cobbles of more than 55% Carboniferous limestone, 8 - 29% Carboniferous sandstone and minor proportions of quartzite and quartz. Interbedded with cemented quartzose sand.
Definition of Lower Boundary: Pronounced irregular unconformity on underlying, mainly Triassic bedrock.
Definition of Upper Boundary: Locally overlain by till (Quaternary).
Thickness: Variable, locally up to 2.8m
Geographical Limits: Sporadic outcrops extend from a location 750m due west of Spitalhill, northwards to 800m SW of Sandybrook Hall (SK 173 456 to SK 175 476).
Parent Unit: Britannia Catchments Group (BCAT)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Reference Section  Old Grammar School, Ashbourne. 
Chisholm, J I and Charsley, T J and Aitkenhead, N. 1988. Geology of the country around Ashbourne and Cheadle. Memoir of the British Geological Survey, Sheet 124 (England and Wales). 
McMillan, A A, Hamblin, R J O, and Merritt, J W. 2011. A lithostratigraphical framework for onshore Quaternary and Neogene (Tertiary) superficial deposits of Great Britain and the Isle of Man. British Geological Survey Research Report, RR/10/03. 343pp. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: