780 



E. HILL AND T. ft. BONNET ON THE 



on the Map, Stcward's-Hay Spring, on the continuation of the blue 

 patch which marks the quartzite quarry. The patch is rightly con- 

 tinued on the Map to within the wood ; but the syenite, on which 

 nearly all the latter grows, is only indicated as existing near the 

 house, a quarter of a mile further north. The quarry is small, old, 

 and quite shallow ; and a pheasant-feeding house stands on its 

 floor. On the north side is rather coarse ashy slate, much jointed ; 

 on the south is syenite, which becomes a little more finely crystal- 

 line (but only a little) as it approaches the slate. We found the 

 junction at the right-hand corner of the pit, and traced it some way 

 across the floor. No one accustomed to examine junctions of igneous 

 and sedimentary rock can for a moment donbt the nature of this. 

 The line of contact is wavy and slightly irregular. Further careful 

 examination shows a large piece of slate caught up by and included 

 in the syenite (see fig. 6) ; from this we succeeded in obtaining 



Fig. 6. — Syenite intrusive in Slate, Steward' s-Hay Spring Pit, in 

 Bradtjate-House Wood. 



a. Syenite, b. Slate, c. Debris and vegetation, partly covering up the 

 joint-face of the slate, which seems to have passed in places almost along the 

 junction, so as to leave a flake of slate adhering to the syenite. 



junction specimens, which we have since subjected to microscopic 

 examination. The result of this fully confirms, were there any need 

 of it, the evidence of the section. 



About 250 yards further west, north of the walk, in the midst of 

 the brushwood, we again found the syenite and slate in contact. 

 Here, also, though the slate is more highly altered than at the other 

 spot, the nature of the junction is quite as evident. The irregular 

 line of contact can be traced for several feet ; and a few feet below 

 it is another bed of ashy slate, into which also the syenite can be 

 seen to intrude. The slate at each of these places bears a consider- 

 able resemblance to that of the slate-quarry in Bradgate Park — an 

 additional evidence for the identity of the quartzite beds in the two 

 localities. 



At the point on the Map where there is a dip-arrow under the 

 L of Linford, banded slates can be traced up to within a yard (even 

 less if a projecting fragment be really in situ) of the syenite. The 

 latter somewhat changes its character as it approaches the slate, 



