206 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 12, 
drifts of Worcestershire and Warwickshire into three classes, viz. 
“<(1) Erratic gravel without chalk-flints, (2) Erratic gravel with 
chalk-flints, (3) Local or non-erratic gravel ;” from which it appears 
that he was not aware of the existence of the Boulder-clay in those 
counties, although he mentions the occurrence of a stiff clay, con- 
taining fragments of chalk, near Princethorpe, in Warwickshire. 
Description of the Drifts of the Upper Series.—Referring to the 
accurate descriptions of the several classes of drift and their geo- 
graphical distribution, contained in the papers of Strickland pre- 
viously mentioned, I shall confine myself to some observations 
bearing on the extension of the subject which I have had the op- 
portunity of making. 
A (1). This deposit of quartzose flinty gravel and sand is found 
overlying the Boulder-clay in the neighbourhood of Rugby ; in some 
places it rests immediately upon the basement rock, as at Kenil- 
worth, where it shows signs of stratification, the sand being lami- 
nated in the middle bed. A small rounded boulder of grey-coloured 
porphyritic granite was observed lying in the upper gravel-pit ad- 
joining. 
B (2). The area covered by the Lower Lias clay defines pretty 
accurately the boundary of the purple-coloured Boulder-clay in the 
north-east part of Warwickshire. The deposit is irregularly distri- 
buted over the surface of the high ground, whence it descends into 
portions of the valleys, attaining a considerable thickness in both 
situations. 
B (2), F. After leaving the district of the Lias, and passing 
downwards to the region of the New Red Marls, we find a change 
in the composition and colour of the unstratified beds. Although I 
have separated them into two classes B (2) and F,—their character- 
istic features are so much alike, that I believe they both belong to 
the ‘General Quartzose Drift” of Strickland, or “ Northern Drift ” 
of Sir R. I. Murchison. The composition of the beds in the district in 
question has been described in general terms by Strickland. With 
regard to the occurrence of flints in them, my observations have led 
me to conclude that these are distributed through the beds in a per- 
sistent manner, although the relative proportion of them to the 
other components is small. Seams of carbonaceous matter and 
lumps of drifted coal are not unfrequently met with. In a sand-pit 
on the north-west side of Cracombe Hill I observed a peculiarly 
contorted arrangement of the beds. Narrow seams of finely lami- 
nated sand of a red colour were seen interbedded between layers 
of fine sandy gravel. On the right-hand side of the section appeared 
a thin seam of light-coloured marl following a curved direction. 
The longer axes of the pebbles and the sand-seams were inclined at 
an angle of about 70° N.W. At Sheriff’s Lench and in the quartzose 
flinty gravel at Bredon I have observed somewhat similar phenomena. 
The liver-coloured and greyish pebbles of quartzite, so abundant in 
these beds, are commonly found broken in half, having their, frac- 
tured edges slightly rounded; their surfaces exhibit small hollows 
of a lightish colour, due probably to disintegration. The pebbles 
