1897.] NEW YORK ACADEMY OF SCIENCES. 231 



or swell out, whilst hundreds of feet of shale in one place are 

 represented by a few feet of sandstone in another, 



It is possible that some of the thickest and most valuable 

 coals are persistent over the great part of the coal field, being 

 known under different names in different districts and altering 

 somewhat in their character. The extreme east of the coal field 

 we may define as 



(a) Oldham and Dukinfield Area. 



The best general section of which is that given by Professor 



Hull, on page 24, of the Geological Survey Memoir of the 

 Country around Oldham, and reproduced here. 



Goal Series of Oldham and Middleton. 



BAEDSLEY COLLIERY. 



Ft. In. 



" Bardsley Rock " (sandstone) 45 6 



Shale 31 7 



StitWs Mine (coal) 1 5 



Metal (shale) 25 6 



Fairboftom Mine 2 



Shale, with three thin seams of coal 76 6 



Park 3Iine (co«/, with parting of clay) 3 6 



Shale 29 feet ; Foxhole's rock, 79 feet 8 inches 108 8 



FoxJioWs Mine 2 4 



Soft Metal 32 6 



Cannel 1 6 



Strata, principally shales, with a coal seam 16 inches 187 8 



Hathershmc Mine 2 2 



Shale, with two seams of coal 51 



Rock and rock bands, with water (Chamber Rock) 88 6 



Shale and sandstone 38 3 



14. Nield or Upper Chamber Mine {sometimes absent) 2 



Shale and sandstone 54 6 



f coal 1 ft. 5 in. "] 

 I dirt " 4 " I 



15. Lower Chamber 3Ime -\ coal 1 " 2 " [- 4 3 



dirt " 8 " I 

 coal " 8 " J 



GLODWICK COLLIERY. 



Shale and bands of sandstone 66 



Red sandstone, with plants ( Bienfire Rock ) 146 9 



fcoal and cannel 1 ft. 11 in. ") 



I dirt " 6 '• I (very 



16. Bienfire Coal -j coal " 11" |- variable). 5 



I dirt " 11 " I 



[coal " 9 " J 



Sandy shale and shale 76 7 



