BGS mineralogy and petrology collection record

Sample number	E23887; COLLNOBN31;
Sample Donor	Bisson,G.
Rock name	'Original entry: Contact Altered, Tuffaceous, Silty, Argillaceous Rock'
Stratigraphy	Not entered
Comments	Collected within 524 Ft. of West Portal.
Locality details	Prewley Tunnel. Dump at W. end.
50k map sheet	Okehampton (324) View images in GeoScenic related to 'Okehampton' View the geology near 'Okehampton'
Map reference
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.