BGS mineralogy and petrology collection record

Sample number	E29490; COLLNOYG134;
Sample Donor	Smith,D.B.
Rock name	Not entered
Stratigraphy	Not entered
Comments	Lower Magnesian Limestone c20' above horizon of Marl Slate with cavity containing ? Dolomite Crystals
Locality details	Lowest horizon exposed on main face in centre of Houghton-Le-Spring quarry
50k map sheet	Sunderland (21) View images in GeoScenic related to 'Sunderland' View a geological map near 'Sunderland'
Map reference	NZ 339 506
Year collected	Not entered
Bore name	Not applicable
Confidentiality	No restrictions

Petrological thin sections

Field of view: c. 31 mm.