BGS mineralogy and petrology collection record

Sample number	E11008; COLLNO89;
Sample Donor	Matley, C.A
Rock name	'Original entry: Mylonised Shale'
Stratigraphy	Not entered
Comments	Ordovician. Arenig. See Mem.Geol.of Anglesey. pp.545:465:555. Folding Pl. X111. Just below Carmel Head Thrust Plane. Highly sheared with authigenic mica. Ordovician beds just below thrust.
Locality details	Porth-yr-Ebol
50k map sheet	Holyhead (93) View images in GeoScenic related to 'Holyhead' View the geology near 'Holyhead'
Map reference	SH 301 928
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.