The BGS Lexicon of Named Rock Units — Result Details

Nantmel Mudstones Formation

Computer Code: NTM Preferred Map Code: Ntm
Status Code: Full
Age range: Ashgill Series (OA) — Ashgill Series (OA)
Lithological Description: Silty mudstones with dark burrow mottles. Several thick units of laminated hemipelagite. Scattered packets with thin sandstones. Thick unit of interbedded conglomerates, sandstones, pebbly mudstones and mudstones known as Doldowlodd Conglomerate (Member) locally present.
Definition of Lower Boundary: Gradational incoming of sequence, dominated by burrow mottled mudstones, above the black laminated mudstones of the St Cynllo's Church Formation.
Definition of Upper Boundary: Sharp incoming of coarse silty mudstones with silt laminae or slumped mudstones, above burrowed mottled mudstones of the Doldowlod Conglomerate (Member).
Thickness: Not defined.
Geographical Limits: Central Wales.
Parent Unit: Not Applicable (-)
Previous Name(s): Camlo Hill Group (-4815)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Road section on A44 west of Nantmel Village. 
Reference(s):
none recorded or not applicable
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E179 E193