442 D. MACKINTOSH ON THE ERRATIC BLOCKS OF 
the large Criffel boulders of Market Drayton are accompanied by 
large Lake-district felstones, which are probably the product of a 
previous dispersion. Between Market Drayton and Ashley village 
large felstone boulders are numerous. Opposite a cottage called the 
Red Bull (on the Ordnance Map) the exposed part of a partly blasted 
and partly buried felstone boulder measures 7 x3} feet. Around 
the little-known eminence called Ashley Heath (which is the highest 
ground between the Pennine and Welsh hills north of the Wrekin) 
there are many felstone boulders, and on the summit of the eminence 
a boulder, probably the same as that noticed many years ago by Mr. 
Charles Darwin, may be seen. Only 4x3x1 foot of it is above 
ground, It is apparently a syenitic kind of greenstone. After much 
searching I succeeded in finding it with the intelligent assistance 
of Miss Taylor, of Westfield House, Its height above the sea 
is about 4 feet below that of the top of Ashley Heath, which is 
774 feet above the sea. The Ashley felstone boulders probably lie 
in the same line of dispersion with those around Bushbury village. 
At Ashley they are accidentally accompanied by a few, and at Bush- 
bury by many Criffel-granite boulders probably belonging to a later 
dispersion. 
6. Furthest west and highest Boulders.—West of the lower course 
of the river Dee, Eskdale greatly predominates over Criffel granite. 
It reaches its greatest height (so far as I have noticed) where it 
extends furthest west—that is, on Halkin Mountain, Flintshire, 
where numerous pebbles of it may be found quite 900 feet above 
the sea. Its western boundary runs south by Caergwrle, a short 
distance west of Wrexham and Ruabon, to Oswestry, where, in a 
very large gravel-pit, it is well represented. From Oswestry it runs 
to Church Stretton along a line I have not worked out. The granite 
is accompanied by Lake-district felstone. Large boulders of both the 
granite and felstone may be found at Ellesmere, Whitchurch, Wem, 
Shrewsbury *, on the eastern slope of Haughmond hill, at Admaston, 
near Wellington, &e.7 
7. Remarkable isolated load of Eskdale-Granite and Lake-district- 
Felstone Boulders around Burton, Shropshire.—The houlder-stream 
which suddenly terminated in this abruptly-bounded concentration 
probably went south by the neighbourhood of Shrewsbury. It differs 
from the great Criffel terminal cencentration in its terminating 
suddenly on its up-stream as well as lee side. The area covered by 
large boulders is about one mile and a half in length and one mile 
in breadth. The smaller detritus extends a short distance beyond 
on the lee or south side. ‘The large boulders are most numerous in 
and around Burton village, where the felstones reach 4 x 3 x 13 foot, 
and the granites 33x2x2 feet; but they are likewise numerous 
along the road-side leading up to the grayel-pit near the summit of 
* Tn Shrewsbury, as usual, they are chiefly found in the back streets and 
courts or in the outskirts. 
t The southerly course of the northern boulders has been extensively crossed 
in a south-easterly direction by boulders from the eastern border of the Welsh 
mountains. At Ellesmere, for instance, most of the boulders are Welsh. 
