| Computer Code: |
AUC |
Preferred Map Code: |
AUC |
| Status Code: |
Full |
| Age range: |
Early Devonian Epoch (DL)
— Early Devonian Epoch (DL) |
| Lithological Description: |
Yellow to red-brown, medium- and coarse-grained, poorly-sorted volcaniclastic sandstones with pebble beds and substantial interbeds of andesitic lava pebble conglomerates, and thin fine-grained sandstone, siltstone, mudstone and andesitic and basaltic lava beds. |
| Definition of Lower Boundary: |
The base of the substantial thickness in excess of 30m of volcanogenic sandstones and conglomerates above the andesitic volcanic pile of the Duneaton Volcanic Formation seen in Duneaton Water in the New Cumnock area, and above the Biggar Formation in the Biggar area. |
| Definition of Upper Boundary: |
The unconformity with the overlying Upper Devonian-Carboniferous strata, exposed in the burn north of Clocklowie Hill at NS 696 179, below a cornstone bed. |
| Thickness: |
Estimated to be up to at least 1800 m thick along the Duneaton Water, where the youngest beds lie in the core of a syncline. |
| Geographical Limits: |
Ayrshire and Lanarkshire, and between the Ayrshire Coalfield and the Pentland Hills. |
| Parent Unit: |
Lanark Group (LNK)
|
| Previous Name(s): |
Auchtitench Formation
(-659)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Cuttings and stream sections around Auchtitench Hill summit [NS 710 180]. |
| Type Section |
Along Duneaton Water, from the base at 150m N, 45 deg W of the junction of Bain's Burn with Duneaton Water [NS 7770 2256], eastwards to the centre of the syncline near the Southern Uplands Fault [NS 8060 2194]. |
| Reference(s): |
| Smith, R A. 1994. Geological notes and local details for 1:10 000 sheet, NS72SW. British Geological Survey Technical Report, WA/94/9. |
| Smith, R A. 1999. Geology of the New Cumnock district - a brief explanation of the geological map. Sheet Explanation of the British Geological Survey. 1:50 00 sheet 15W, New Cumnock (Scotland). |
| Browne, M A E, Smith, R A, and Aitken, A M. 2002. Stratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. British Geological Survey Research Report RR/01/04. 67 pp. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S015
S024
S015
S023
S024
S022
|
