Computer Code: |
ASGR |
Preferred Map Code: |
notEntered |
Status Code: |
Full |
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
|
Stratotypes: |
Reference Section |
Old Grammar School, Ashbourne. |
Reference(s): |
Chisholm, J I, 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: |
E124
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