The BGS Lexicon of Named Rock Units — Result Details

Clyde Sandstone Formation

Computer Code: CYD Preferred Map Code: CYD
Status Code: Full
Age range: Chadian Substage (CI) — Chadian Substage (CI)
Lithological Description: Predominantly sandstone, commonly pebbly with beds of red-brown or grey mudstone. Pedogenic carbonate as nodules and beds especially in lower part, also present as rip-up clasts.
Definition of Lower Boundary: Conformable base taken in a transition from the underlying mudstone/cementstone association of the Ballagan Formation to a sandstone dominated succession.
Definition of Upper Boundary: The top is marked by the overlying Clyde Plateau Volcanic Formation.
Thickness: 0 to 300m+
Geographical Limits: Scottish Midland Valley.
Parent Unit: Inverclyde Group (INV)
Previous Name(s): Downie's Loup Sandstone Formation [Obsolete Name: Use CYD] (DWS)
Downies Loup Sandstones (Stirling) (-180)
Balcomie Beds (Fife) (-2736)
Alternative Name(s): none recorded or not applicable
Partial Type Section  British Geological Survey Barnhill Borehole. BGS Reg. No. NS47NW/2 from 104.81m (upper boundary) to 161.48m depth. 
Partial Type Section  British Geological Survey Knockairshill Borehole. BGS Reg. No. NS37SW/10 from 50.68m to lower boundary at 222.90m depth. 
Paterson, I B and Hall, I H S. 1986. Lithostratigraphy of the late Devonian and early Carboniferous rocks in the Midland Valley of Scotland. British Geological Survey Report, 18/3. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S029 S030 S003 S015 S023 S031 S030 S030 S038 S039 S041