nOLL — MALTEEBT HILLS. 83 



sionally epidote and chlorite. The beds arc for the most part massive, 

 but have nevertheless a foliated structure*. 



The general direction of the strike is from the north-west to the 

 south-east. 



The rocks of the two remaining hills are similar to those of the 

 North Hill. In the Sugar-loaf Hill they are not well exposed. 

 Massive gneissic rocks, and thick-bedded rather fine-grained horn- 

 blende and felsj)ar rock, with occasionally a little quartz, occur above 

 the Westminster Arms. Coarse-grained diorite is exposed on the 

 western slopes of the hill, near a trap-dyke, and granitoid rock vnth 

 much oxide of iron in a quarry below, near the roadside. At the 

 north-eastern part of the hill the same thick-bedded rock, rich in 

 hornblende, occurs as that about the summit of the North Hill ; and 

 beyond this, at the constriction between this and the Terminal Hill, 

 is a disintegrated granitoid rock. 



The rocks of the Terminal Hill closelj resemble those of the North 

 Hill, and are, perhaps, the north-westerly extension of the same 

 beds. At the southern extremity of the hill they are chiefly thick- 

 bedded gneissic rocks, composed of felspar and mica, or hornblende, 

 or both, with sometimes the addition of quartz. Near the centre of 

 the hill is seen coarse-grained hornblende and white-felsjiar rock 

 (diorite), and towards its northern extremity it is crossed from the 

 north-west to the south-east by two trap-dykes. Beyond these, 

 and on its northern slopes, is a massive rock composed of felspar, 

 quartz, and much green mica, very unequally distributed, which 

 gives to the rock a patchy and more or less foliated structure f. 



Three small outlying bosses of the Malvern crystalline rocks pro- 

 trude through the Llandovery rocks of Cowleigh Park. They con- 

 sist partly of trap and partly of gneissic rocks containing both mica 

 and hornblende $. Further to the north, near Martley, there is 

 another boss of these rocks. 



8. General consideraiio?is. — ^The great instability in the mineral 

 aspects of these rocks, even within very limited distances, fenders it 

 impossible to avoid some generalization in the description of them. 

 The schistose portions show various intermediate stages between the 

 amorphous and semicrystalline condition and true micaceous and 

 hornblendic schist. In like manner, between the dark-greenish 

 uncrystallized rock of the Ragged-stone Hill and Wind's Point and 

 the coarsely crystallized black and white diorite § of the northern part 



* The bedded structure of these rocks is noticed by Horner, op. cit. § 25. 

 p. 294. See also Phillips, op. cit. p. 35. 



t Epidote, more or less abundant in many parts of the range, is especially 

 so in this hill. 



J The peculiar appearance of the May Hill Sandstone along the line of 

 fault on the east of the southernmost of these bosses is probably due, as sug- 

 gested by Professor Phillips (op. cit. p. 37), to the chemical agency of water 

 holding silica in solution, which has also caused the filhng-in of the fault with 

 quartz : it is certainly not due to the action of heat, as similar appearances are 

 visible along the line of fault north of Ankerdine, near which there are no cry- 

 staUine rocks. 



§ This rock is the syenite of Prof. Haughton and some German writers ; 



g2 



