The BGS Lexicon of Named Rock Units — Result Details

Corbie's Tongue Conglomerate Formation

Computer Code: CBT Preferred Map Code: CBT
Status Code: Pending Upgrade
Age range: Lochkovian Age (DO) — Pragian Age (DP)
Lithological Description: Conglomerate, with rounded quartzite cobbles, reddened on the outside, set in a silty, or in places calcareous, matrix.
Definition of Lower Boundary: Unconformity on Dalradian metasediments and Caledonian plutonic rocks.
Definition of Upper Boundary: Transition from conglomerate to shale.
Thickness: Approx. 10 metres in type section, probably increasing southwards to 15 - 20 metres on Glaschul Hill (NJ 458 149).
Geographical Limits: Not defined.
Parent Unit: Rhynie Group (RHN)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Area  Corbie's Tongue, Sheet 76W, Scotland. 
Wilson, J S G. 1890. Explanation of Sheet 76 Central Aberdeenshire. Memoir of the Geological Survey (Scotland). 
1:50K maps on which the lithostratigraphical unit is found, and map code used: