NORTHERN OUTCROP, CUMBERLAND COAL FIELDS — GILPIN. 389 



PRODUCTIVE COAL MEASURES. 



Upper part 2134 feet. 



Lower " 2623 '■ 



4757 feet. 



MILLSTONE GRIT. 



Upper part 2000 feet. 



Middle " 3240 " 



Lower " 640 " 



5880 feet. 



The lower part of the Upper Coal Measures is exposed at Rag- 

 ged Reef, where it is made up chiefly of hard and massive gray 

 and white sandstones, with occasional beds of a reddish colour, and 

 red and gray shales. 



The upper part of the Productive Coal Measures comprises 

 about 1000 feet of gray sandstone, and nearly the same thickness 

 of gray and reddish shale and tire clays. It contains 22 coal beds, 

 all of which are thin and of poor quality as exposed on the shore, 

 and will not be again referred to in this paper. 



The lower part of the Productive Measures, holding all the 

 workable seams yet known on- the shores, is characterised by 

 gray sandstones, and gray and dark coloured shales. 



The Millstone Grit series forms an abrupt change in appearance 

 to the measures holding the coal beds. It consists of reddish 

 shales and red and gray sandstones, the latter passing into fine 

 grits and conglomerates. It is, moreover, destitute of coal, and 

 shows very few fossils beyond a few drifted pieces of wood. 



The following section of the lower part of the Productive 

 Measures shows the principal coal beds and their relative posi- 

 tions : — 



Feed. In. Feet. In. 



Strata 339 7 — — 



Main Seam — 7 7 



Strata 75 — 



Queen Seam - — 4 10 



Strata 968 — — 



Coal bed — 4 



Strata ' 18 — — — 



New Mine Seam .... — 30 



Strata 1160 — — — 



