168 



MESSES. KIRKBY AND DUFF ON THE 



SECTION OF STRATA AT OAKY BANKS QUARRY. 



Feet. In. 

 1 . — Flaggy sandstone, with shaly partings below 7 



2. — Blue shale — fissle 4 



3. — Sandy shale 1 



4. — Blue shale — fissle 3 



5. — Hard, blackish sandstone 6 



6.— Soft sandy shale 6 



7. — Dark grey micaceous sandstone, with annelid mark- 

 ings on surface planes , 3 



8.— COAL 1 2 



9. — Hard, fine grained siliceous sandstone ) ( 6 



^"Ganister'M 

 10. — Soft sandstone, of irregular texture J 1 1 2 



11. — Sandstone, with soft ferruginous concretions 2 



12.— Sandy shale 6 



13. — Yellow sandstone, irregularly bedded, with many 



large concretions 4 



14. — Sandy micaceous shale, variegated and foliated, with 



worm tracks and ripple marked surface planes... 3 

 15. — White, grey, and yellowish flags of fine grained 



sandstone, with ripple marked and worm tracked 



surfaces 8 



39 4 



The beds worked are the flags (No. 15) at the base of the 

 section, which have been followed a considerable distance under- 

 ground. The surfaces of the flags are often beautifully rippled, 

 or covered with current markings and the tracks of annelids or 

 other forms of submarine life. The coal is coarse and of little 

 value. 



s ^^^g^g^-^ Various borings have been 



JEv~- - ^isfe, made in these Measures in 



^M^^i^^^^M search of workable seams of 



b "^x^==^^r^z\ coal. One of the most im- 



'.-r^v^rV r^^^jgg portant was made in the 



jj .^^BiH^^Spf year 1834, from the floor 



10 l:-^£M^0W^t^\ °f the Brockwell at Witton 



Fig. llV-Section at Oaky Banks Quarry. Park Colliery, of which We 



are enabled to give a detailed account through the kindness of 

 Geo. Graham, Esq., of Thistleflat Colliery, near Crook. 



