the Basaltic District in the North of Ireland. 261 

 Hummocks of the Second Limestone, 



Hobthurst Houses, in Wey-dale, near Little Longstone, 

 Hill N. of Miller's dale, near Tidswell, 

 Wormhill, near ditto, 

 Tunstead Hill, near Wormhill, 

 Bole-end Hill, ditto. 



Hummocks of the Third Limestone, 

 Aldwark, near Brassington, 

 Hill N. E. of Green Fairfield, near Buxton, 

 Buxton Town. 



Hummocks of the Third Toadstone, 

 Staden Hill, near Buxton, 

 Knot Low, near Wormhill, 

 Cawton Low, near Chelmerton, 

 Harborough Rocks, near Brassington. 



The hummocks of the Fourth Limestone differ from many 

 of the others above, in our not being able to see these iso- 

 lated masses, resting on any under stratum, since none of 

 the very deep valleys which intersect it, are excavated deep 

 enough, to reach any under measures. The numerous iso- 

 lated conical and peaky hills in Hartington, and other pa- 

 rishes on the W^. side of the Limestone district, are all a 

 sort of massive hummoeks, too numerous here to be named. 



In Dove-dale, in this stratum very extraordinary small 

 hummocks occur, or rather perhaps, in the rude and very 

 wide barren veins by which the vale was intersected : — these 

 are called Tissington Spires, the Sugar Loaves, &c. — Rey- 

 nard's Tor, Hoc-cliff, Pike Tor, 8cc, in Brassington, are 

 also among the interesting hummocks of this stratum. 



The above list, contains none of the many curious "and 

 conspicuous hilis of this district, which are crowned by pro- 

 jecting or suddenly elevated points or edges of strata, still 

 connected with the mass, but only such whose strata or up- 

 per beds, are entirely isolated by a surrounding denudation. 



Small hummocks of Gravel on the heights of this denu- 

 dated tract, consisting of sanu\ mixed with quartz and other 

 very hard and highly rounded pebbles, (not of the rocks of 

 any known part of the glob*, as has been said,) at some 



R 3 miles 



