The BGS Lexicon of Named Rock Units — Result Details

Roddam Dene Conglomerate Formation

Computer Code: RDCO Preferred Map Code: RDCo
Status Code: Full
Age range: Tournaisian Stage (CT) — Tournaisian Stage (CT)
Lithological Description: Conglomerate, typically coarse in massive thick and very thick beds; reddish coloured; subangular to subrounded clasts of pebble to boulder size set in a clay-rich sandstone matrix; matrix supported to clast supported. Clasts predominantly of andesite, derived from the Cheviot Volcanic Formation, but also rare clasts of Silurian mudstone and greywacke sandstone, Cheviot Granite. Minor intercalations of mudstone and sandstone, and sandstone and siltstone at the top.
Definition of Lower Boundary: Not seen, but thought to overlie rocks of the Cheviot Volcanic Formation unconformably.
Definition of Upper Boundary: Not seen, but believed to be overlain by rocks of the Ballagan Formation (formerly the "Cementstone Group") of Northumberland.
Thickness: About 170m seen.
Geographical Limits: Eastern flanks of the Cheviot massif, Northumberland.
Parent Unit: Inverclyde Group (INV)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Type Section  Roddam Dene, south of Wooler, Northumberland. Cossey et al, 2004. 
Cossey, P J, Adams, A E, Purnell, M A, Whiteley, M J, Whyte, M A and Wright, V P. 2004. British Lower Carboniferous stratigraphy. Geological Conservation Review Series No.29. Joint Nature Conservation Committee, Peterborough. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: