114 A. Somervail—Altered Hornblende-Schist. 
Above the village the chalk slopes are entirely bare and without 
traces of a higher-level river-drift. The foregoing woodcut gives 
a section of the valley at this spot (see p. 113). 
No other remains were found here, but at HKynsford, three miles 
lower down the valley, the foreman informed me that they had 
found, at about the same depth, but only 20 feet above the river, 
the entire tooth of a Mammoth. At Green Street Green in the 
adjacent valley of the Cray remains of the Mammoth, together with 
those of the Woolly Rhinoceros, Musk Ox, Horse, Ox and Deer, etc., 
have been met with, and in the associated beds of loam I have found 
numbers of the small shells of Pupa marginata. 
VI.—On a Brecora anp an Atrerep Hornpienpe-Scuist at Housen 
Cove, Lizarp. _ 
By ALZxANDER SomMERVAIL, Esq. 
‘lar rocks forming Housel Bay consist of the normal dark horn- 
A = blende-schists with the exception of those out of which the 
charming little Cove bearing the same name has been formed, which © 
holds nearly the central part of the Bay, facing the south-east. 
The Cove has three small recesses, an east and a west, and a 
central one, which receives a small stream flowing into it; the whole, 
however, a few yards seawards forming one well-defined Cove. 
On descending into the Cove one is immediately confronted by 
rocks presenting a very different aspect from the ordinary horn- 
blende-schists of the adjoining area. A little careful attention on 
the part of an observer will also lead to the detection of a breccia 
in the centre of the Cove, close to the stream; the best guide to it 
being a slickensided surface on which it will be found resting. 
The breccia is only a few inches in thickness, and is confined to 
the under surface of the rock overlying the slickenside. It is 
composed of numerous broken crystals of a greenish-white felspar, 
varying in size from mere specks up to others of nearly an inch in 
length, set in a reddish paste formed out of the rock by crushing. 
It also contains angular and semi-rounded fragments of its own 
mass, and what looks like small well-rounded pellets of quartz 
coloured red by the presence of iron. Besides these there is some 
extraneous like matter possibly introduced or formed during the 
process of its being cemented together. Altogether its origin is 
without doubt due to a thrust, or other movement of the one mass of 
rock over the other with such force as to shatter and groove their 
Opposing faces. 
The rock throughout the entire extent of the Cove (which appears 
to define its limits) weathers into various shades of yellowish-brown 
and red, and when broken up with the hammer is seen to have a 
very near approach to a felsite, which it also resembles in composition, 
being composed principally of felspar and some quartz almost to the 
exclusion of the hornblende. It also contains scattered throughout 
its mass some steatitic or serpentinous mineral of greenish colour 
arranged in (veins and) small concretionary forms. It is, however, 
evidently only an altered condition of the hornblende-schist, as it con- 
