The BGS Lexicon of Named Rock Units — Result Details

Castell Crug Porphyritic Microgranite

Computer Code: CCPM Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Marshbrookian Substage (OM) — Onnian Substage (ON)
Lithological Description: Pale-weathering, flow-foliated, locally porphyritic microgranite.
Definition of Lower Boundary: Not seen.
Definition of Upper Boundary: Overlain unconformably by a local Caradoc conglomerate.
Thickness: Unknown.
Geographical Limits: Not specified.
Parent Unit: Not Available (!)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
none recorded or not applicable
Reference(s):
Young, T P, Gibbons, W and McCarroll, D. 2002. Geology of the country around Pwllheli. Memoir of the British Geological Survey, Sheet 134 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E134