228 E. HILL AND T. G. BONNET ON THE 



ing the slate on both sides for a distance of abont eleven yards. 

 On the south side it rises rapidly to about fifteen feet above the 

 floor, rather more at the end, and is overlain in the vertical wall 

 of the quarry by perhaps eight yards of syenite. On the other 

 side, and at the south-west end, it rises to much the same height, 

 but the syenite has been quarried away. At this end of the 

 excavation some still remains resting on the slate, and we were 

 informed that the latter had been exposed in quarrying away the 

 syenite for about twenty-five yards to the west-south-west, and 

 might still be seen, when the water was low, in a part of the excava- 

 tion not yet filled up by debris. The other excavation also generally 

 contains much water, the presence of which probably accounts for 

 the decomposed condition of the slate. The slate is much crushed 

 and indurated near the junction, and is so much disturbed that we 

 cannot reason upon the indications of its dip, which, so far as can be 

 seen, is towards the north or north-east. There is hardly any 

 appreciable change in the crystalline condition of the syenite as it 

 approaches the slate, so that the whole mass must have been at 

 a high temperature when the former rock broke through it. We 

 think we may, without hesitation, refer the slate (which is rather 

 like that of Billabarrow) to the Forest series, which is thus proved 

 to extend five miles further south than has hitherto been known. 



The syenite of the main mass beneath Enderby village, as shown 

 at Mr. Eawson's quarries, on the north side of the hill, is a little 

 more distinctly crystalline, and is almost undistinguishable from 

 that of Croft Hill described below. Here, too, a little of the Keuper 

 Marl yet remains, showing that these knolls were once almost, if 

 not wholly, buried beneath that deposit. 



The patch of igneous rock at Narborough is not marked on the 

 Survey Map, doubtless because, at the time the survey was made, it 

 was concealed by overlying Keuper, or surface soil. Within the 

 last few years, however, a large and deep pit has been opened. 

 This is situated in a small knoll just outside the village on the west 

 and to the north of the Huncote Road. The rock in general appear- 

 ance somewhat resembles that of Enderby, but the ground-mass is 

 decidedly more compact. The fracture also approaches nearer to 

 conchoidal. The felspar crystals are smaller ; many of them are of 

 a rather bright red colour ; and the dull green patches are much 

 smaller and less abundant. The microscopic structure corresponds, 

 showing the ground-mass of the slide to be microcrystalline, consisting 

 of grains of quartz and felspar ; the larger crystals scattered therein 

 are rather more altered than in the last rock ; but, so far as we can 

 ascertain, orthoclase seems to predominate. The green mineral is 

 generally viridite, which has doubtless replaced small hornblende 

 crystals ; here and there, however, a little of the latter mineral 

 remains unchanged, and there is a little dolomite (or a mineral 

 resembling it). There are fewer grains of magnetite than in the 

 last ; a little epidote may occasionally be detected. This rock, then, 

 may be classed with the quartz-felsites. 



Rather more than a mile further west another mass of igneous 



