12 PROF. T. G. BONNEY ON THE GEOLOGY 
sea in the face of a precipitous headland, difficult of approach, and 1m- 
possible to descend. The two rocks strike a little S. of E., and the 
mica-schist, so far as can be seen from above, appears to plunge at a 
very high angle beneath the chloritic rock, but not more than would be 
_ perfectly consistent with a slight overthrow in the folding. As we 
proceed towards the “ Tail,” the strike becomes E. and W., and about 
a furlong from the junction the dip is distinctly about 60° N. We 
see no more of the mica-schist until, as we proceed from the Tail to 
Hope village by the path along the northern margin of the headland, 
we note some outcropping beds of it in a cove below; and then, beyond 
‘another little cove, where the coast-line bends sharply to the north, 
we find in the crags of a headland first mica-schist, then chloritic 
schist, and lastly mica-schist, all seemingly dipping at a high angle 
to the south. The last-named mica-schist also forms the little *‘ look- 
out ” headland, which divides the two coves, between which extends 
the village of Hope. It is rather dark in colour and marvellously 
gnarled and broken, but the foliation-planes are often vertical. 
We have only to traverse the rocky shore in the northern cove 
at Hope for a very short distance to be convinced that, as is 
indicated in the map, we have returned to the slaty series. Here 
again the mimicry of foliation, and the other results of the tre- 
mendous pressure which the beds have undergone, make it difficult 
to fix the exact position of the junction, but after repeated exami- 
nation on more than one occasion, I came to the conclusion, fully 
confirmed by subsequent microscopic examination, that the beds 
outcropping on the shore were never more than schistose, while 
those in the headland itself, wherever I could get at the crag (ren- 
dered difficult each time by the state of tide), were true schists, so 
that the fault has probably determined the northern face of the 
headland. 
Fig. 6.—Diagrammatic Section near Bolt Tail. (Horizontal scale 
3 inches to 1 mile.) 
Headland of 
Bolt Tail. Lifeboat. Hope village. 
Ss 4, / i N 
hl MMA pk. me HMO. OOO = 
BS 1 PAE: eae at aa 4 e/ 1b z 
4 
Fault. 
a. Slaty rock. b. Mica-schist. ce. Chloritie schist. 
In the floor of the cove the newer series exhibits considerable 
variety of mineral character; but in the crags beyond, dark slaty rocks 
predominate, bearing a general resemblance to the series in the 
headland between Hall Sands and Bossons Sands. In the distance, 
beyond Avonmouth, the peculiar sheen of the cliffs recalls to mind the 
satiny slates seen at Slapton on the east coast, and at Kingsbridge 
at the head of the estuary. 
