| Computer Code: |
DRG |
Preferred Map Code: |
DTR |
| Status Code: |
Full |
| Age range: |
Silurian Period (S)
— Early Devonian Epoch (DL) |
| Lithological Description: |
[Obsolete: use CRN, DRCR] Conglomerate, clast-supported, with well-rounded boulders, cobbles and pebbles predominantly of lava, psammite and quartzite. Lenses and thicker formations of lithic and volcaniclastic sandstone. Trachybasalt and trachyandesite lavas are interbedded with conglomerate. |
| Definition of Lower Boundary: |
Base of Downie Point Conglomerate Member, where thickly-bedded or massive conglomerate overlies pebbly sandstone of Carron Sandstone Formation with apparent conformity. This marks the base of a thick, conglomerate-dominated succession. |
| Definition of Upper Boundary: |
Not seen, presumed to pass up conformably into conglomerate of Crawton Group. |
| Thickness: |
Variable, maximum of 2600m, thinning westwards to less than 1500m. Presumed to be overlapped by younger groups to south-west. |
| Geographical Limits: |
North-eastern Midland Valley, Stonehaven area. |
| Parent Unit: |
none recorded or not applicable
|
| Previous Name(s): |
Dunnottar Conglomerate
(-871)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
Sea cliffs and foreshore, Downie Point to Mons Craig. [See also stratotypes of component (Downie Point Conglomerate; Strathlethan; Dunnottar Castle Conglomerate and Tremuda Bay Volcanic) formations.] |
| Reference(s): |
| Haughton, P D W, 1989. Structure of some Lower Old Red Sandstone conglomerates, Kincardineshire, Scotland: deposition from late-orogenic antecedent streams? Journal of the Geological Society, Vol.146, 509-525. |
| Armstrong, M, and Paterson, I B. 1970. The Lower Old Red Sandstone of the Strathmore Region. Report of the Institute of Geological Sciences No. 70/12 |
| Campbell, R, 1913. The geology of south-eastern Kincardineshire. Transactions of the Royal Society of Edinburgh, Vol.48, pp.923-960. |
| Carroll, S, 1994. Geology of the Stonehaven District. 1:10 000 Sheets NO88NW, NO88NE, NO88SW and NO88SE. British Geological Survey Technical Report WA/94/19. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S067
S066
|
