BGS mineralogy and petrology collection record

Sample number	E57215; MR34483; COLLNOB614;
Sample Donor	Dangerfield,J.; Hawkes,J.R.; Wheatley, C.W.;
Rock name	'Original entry: Porphyritic Volcanic Rock'
Stratigraphy	Not entered
Comments	Quartz porphyry.
Locality details	Old quarry, 2.1 Km 186 deg. From North Hill Church.
50k map sheet	Tavistock (337) View images in GeoScenic related to 'Tavistock' View the geology near 'Tavistock'
Map reference	SX 2700 7452
Year collected	1979
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.