Vol. 5T.] PE0E. T. G. BONNES ON THE NAEBOEOTTGH DISTEICT. 31 



very closely with that from Narborough, and that from Groby Poo] 

 Pit with the average of Croft Hill, while the ordinary rock of Groby 

 corresponds with that of Barrow Hill and Sapcote ; that from Mark- 

 field exceeding both, and all being surpassed by the rock of New Cliff. 

 It may be only a coincidence, but, as the map shows, these three 

 places lie on a zone running roughly north and south in the direc- 

 tion of the New Cliff diorites, and the Groby rock lies north of 

 Narborough and Enderby. The general results suggest the proba- 

 bility of a connexion between the principal igneous masses in the 

 Charnwood and Narborough districts, and the possibility that even 

 those of Warwickshire may not be dissociated from them. 



These rocks, so far as macroscopic and microscopic aspects go, 

 seem to be separable into three groups, though the second in one 

 case comes rather near to the third: — (1) The rock of the pit south- 

 east of Enderby and the two west of Narborough ; (2) that from the 

 northern side of Enderby village, from Croft Hill, and from the 

 Stanton-Sapcote massif; (3) that from Barrow Hill. The first are 

 microgranulites, the second distinctly holocrystalline, but fine- 

 grained. Both are porphyritic, though inconspicuously so, and both 

 intermediate between syenites and diorites * ; the third is a little more 

 definitely dioritic. Though they differ, as already pointed out, 2 

 from the syenites of the Groby district and the hornblendic granite 

 of Mount Sorrel, I think it probable that they belong to the same 

 epoch of irruptive disturbance. As to the date of this we can only 

 speculate. It can hardly be later than the Carboniferous, for the 

 rock above the Coal Measures in the Whitwick district is basalt, and 

 the dioritic rocks of Warwickshire (Nuneaton district) are intrusive 

 and do not pass the unconformity at the base of the Coal-field. 3 



Sections exhibiting the relations of the Boulder Clay, Keuper Marl, 

 and ' syenite ' were more numerous and extensive than formerly, 

 and as these are being constantly destroyed I shall venture to record 

 a few observations. These may be grouped as follows : — (a) The 

 relation of the Boulder Clay to the Keuper and the syenite ; (b) the 

 condition of the surface of the last-named ; (c) the matrix and frag- 

 ments of the Boulder Clay. The sections examined were : near 

 Sapcote, in the great pit on the southern side of Croft Hill, at 

 Mr. Rawson's pit on the northern side of Enderby village, and in 

 the pit west of Narborough. 



(a) The first of these sections calls for no remark under this head. 

 At the second place the Boulder Clay was seen, at the northern end 

 of the pit, to rest against the syenite, as the latter rises towards the 



1 Compare analyses of the Huncote, Markfield, and other Forest rocks by 

 Mr. Berry, Quart. Journ. Geol. Soc. vol. xxxviii. (1882) p. 197 ; and another 

 of the Markfield rock by Mr. Player, Hatch's ' Text-book of Petrology' (1892), 

 p. 147. 



2 Quart. Journ. Geol. Soc. vol. xxxiv. (1878) p. 231, and vol. xxxviii. (1882) 

 p. 197. 



3 On this interesting question, see the important remarks by Mr. H. T. Brown 

 (Quart. Journ. Geol. Soc. vol. xlv. 1889, pp. 27-38) and by Mr. Straban (Geol. 

 Mag. 1886, p. 540). 



