182 J. T>. KENDALL ON HEMATITE IN THE SILURIANS. 



Fig. 3. Vertical Section of Hcematite vein,. 





A. Glacial drift. B. Limestone. C. Haematite. d,e?,^. Bed-joints. 



The direction and dip of the veins, it will he observed, are exactly 

 the same as the direction and dip of the bed-joints of the Lime- 

 stone, the strike of both being about 65° N.E. and S.W., and their 

 dip about 80° to the N.W. This is the point which I wish chiefly 

 to place before the Society. In the paper before referred to, as 

 already stated, I pointed out that the haematite deposits in the Car- 

 boniferous Limestone of Whitehaven and Purness invariably coin- 

 cide in direction with the meridional divisional planes intersecting 

 that rock, and that the deposits in the Silurian slates at Knock - 

 murton, near Whitehaven, have two directions, which coincide with 

 either one or the other of the divisional planes of those rocks. The 

 Water-Blean deposit, however, appears to me to be different from 

 either of these, the deposition of the ore having taken place along the 

 bed-joints of the rock. In some of the Whitehaven deposits, as at 

 Parkside and Bigrigg Moor, a phenomenon somewhat similar to 

 this is to be seen, as shown in fig. 4, which is a vertical section of 

 the Parkside deposit ; but there the strata lie at such a low angle 

 that the ore -deposit is more like a bed than a vein. Their likeness 

 to the Water-Blean deposits, however, is only partial ; for, notwith- 

 standing their bed-like appearance, and the fact of their being 

 parallel to the bed-joints of the rocks, the deposits nevertheless 

 have their longest axis 'parallel to the meridional divisional planes; 

 and the strike of the rocks does not in any way determine the direction 

 of the deposits, as it does at Water Blean. 



The direction of the Water-Blean deposit is exactly the same as 

 the strike of the rocks in which it occurs, and altogether different from 

 the directions of either of the divisional planes. 



