The BGS Lexicon of Named Rock Units — Result Details

Glanyrafon Formation

Computer Code: GLR Preferred Map Code: Glr
Status Code: Pending Upgrade
Age range: Telychian Age (ST) — Telychian Age (ST)
Lithological Description: Thinly interbedded turbidite sandstones and mudstones with both laminated and burrowed hemipelagites.
Definition of Lower Boundary: Gradational contact with Caeran Mudstones, at top of highest thick argillaceous sandstone bed of the Rhuddnant Grits.
Definition of Upper Boundary: Gradational contact with Dolgan Mudstones.
Thickness: Up to 300m.
Geographical Limits: Central Wales.
Parent Unit: Cwmystwyth Grits Group (CWY)
Previous Name(s): Moelfre Grits [Obsolete Name and Code: Use GLR] (-1563)
Alternative Name(s): none recorded or not applicable
Type Section  Rhydyclwydau Brook for c.2km east of Glanyrafon. 
Definition not published. 
1:50K maps on which the lithostratigraphical unit is found, and map code used: