SUPPLEMENTARY NOTE B, 



ON THE CRYSTALLINE BODIES OF THE SUNDERLAND 

 PERMIAN MAGNESIAN LIMESTONE. 



Fig. 1. 



Fig. 2. 



FIG. 1 represents a section of Permian limestone, exposed in a 

 railway-cutting between Sunderland and Ryhope, as displayed 

 when I made a sketch of it about the year 1846. The beds 

 exhibit well-developed jointing, running in two directions. The 

 front or face of the section is a joint-plane (as is also the one 

 further, in) belonging apparently to the equatorial system ; the 

 oblique lines, also the end-surface parallel with them, belong to 

 the west-of-north meridional set. The horizontal lines and the 

 corresponding surface at top represent bedding. The interest 

 which attaches to this section is the fact, well displayed, that 

 the coralloidal bodies spring from the planes of both bedding 



