541 
Quartz Rock of the Lickey Hill , Sic. 
granite upwards to chalk, are accumulated in the form of diluvian 
gravel on the surface of all the strata which constitute that midland 
part of England. 
It is mentioned in a paper by Mr. A. Aikin, on the Gravel at 
Litchfield, printed in the fourth volume of the Geological 
Transactions, that he found near that town pebbles of granite, 
syenite, greenstone,, schist, limestone, quartz, chalcedony and 
hornstone, all of which with the exceptions of the quartz have 
undergone considerable decomposition ; amongst these the pebbles 
of corralline limestone are most abundant, and like those of the 
chert appear to have been derived from the mountain limestone 
of Derbyshire, and to have been accumulated at the same period 
with the gravel beds of Shipston on Stour, and of the valley of the 
Thames. 
In a very able and ingenious paper by Sir James Hall, in vol. 7, 
of the Transactions of the Royal Society of Edinburgh, he has 
recorded his discovery of similar traces of the action of a diluvian 
current on the surface of the hills and vallies near that city. These 
districts are not only strewed over with the gravelly wreck of rocks 
that have been drifted to a great distance from their native bed 
by the force of violent waters ; but Sir James has also observed 
channels and furrows, which he calls dressings, still remaining on 
the surface of the hard rocks over which these waters passed, 
driving before them blocks and fragments of every substance that 
lay in the line of their course, and excavating vallies of denudation 
analogous to those we have described in Oxfordshire. 
Mr. Weaver, in his very valuable memoir on the Geology of the 
East of Ireland, at p. 294 of the present volume, has discussed the 
subject of the denudations there displayed, and the gravel pro- 
duced by the retiring action of a subsiding mass of waters, 
