Mr. Trevelyan' s Notice of a Bed of Whin. 



59 



of Forster's Section) ; it has, I believe, been sunk through in some of 

 the Rookhope mines, and has been reached in Softlyside and other 

 mines, near Stanhope, which Forster has erroneously stated (from 

 supposing this to be the great Whin-sill) to be worked down to the Tyne- 

 bottom Lime. 



I hope I may have an opportunity this year of examining this bed 

 again with more care, and shall be glad to communicate to the Society 

 any further information I may be able to collect. 



A SECTION OF THE STRATA IN ROOKHOPE BURN. 



A. A bed of Limestone, of a dark grey colour, and splintery fracture, with minute specks 

 of white Calcareous Spar, 3 feet thick. 



B. Trap or Basalt, of a dark iron-grey colour, and fine-grained fracture, V feet thick. 



C. Limestone altered by its contiguity to the Basalt ; texture, crystalline ; colour, grey and 

 white mixed. 



D. The lower part of the Limestone of a dark grey colour, and splintery fracture, with 

 specks of Iron Pyrites, mixed through it. 



