ON THE ERRATIC BLOCKS OF ENGLAND, WALES, AND IRELAND. 139 
The probable sources of three-fourths of the erratics which have been 
identified are to the north-west. 
Slate rocks and tuff, from Borrowdale volcanic series of the Lake 
districts. 
Carb. limestone and chert, from North Lancashire or North-west 
Yorkshire. 
New red sandstone, from North Lancashire. 
Millstone grits and gannister series, from Pennine hills and borders, 
across South-west Yorkshire to Crosspool. 
Several of the specimens were probably derived from the east lowlands 
of Scotland, while the magnesian limestones are from the north-east of 
England. 
Midland Counties—From Professor T. G. Bonney, M.A., F.R.S., the 
Committee has received the following report :— 
Erratic blocks are so rare on or near the northern edge of Cannock 
Chase, in the vicinity of the Trent, that the following instances are worth 
recording. 
In the immediate neighbourhood of Rugeley I only know of one 
erratic; as a rule one does not hesitate to refer all pebbles to the Bunter 
conglomerate, directly or indirectly. That formerly stood in an open 
part of a street on the south side of the town, where the name ‘ Crossley 
Stone’ is still a record. Some years since it was broken up, and the 
fragments removed to the neighbourhood of a canal wharf on the opposite 
side of the town. There are now two fragments, partly buried in the 
ground: the larger measures 4:ft. 6 in. x 4 ft., and is at the thickest 
part 1 ft. 2 in.; the other piece is a little smaller. The first two dimen- 
sions, as far as I can remember, represent the area of the original stone. 
The rock is a compact grey felstone, a typical example of a boulder of the 
‘ Arenig dispersion.’ 
In the village of Colton, about one mile from the Trent, and on its 
left bank, boulders appear to be more common. Four are used as guards 
at the angle of a little bridge near the church; one is rudely triangular 
each side. being about 2 ft. “6 in., and the thickness about | ft. 3 in. ; 
second is about 3 ft. x 1 ft. 9 in. x 1 ft. 6in.; a third rather coal 
These are a grey granite, like that from Criffe. The fourth boulder is 
rather oval, its longest diameter being about 3 ft. This is a moderately 
coarse syenite, consisting of pinkish felspar and green hornblende, with a 
little quartz—I believe, a Scotch rock; these, of course, are not im situ, 
but cannot have been brought from far. Built into walls, used as steps, 
or lying about in or near the village, are several other boulders of smaller 
size, commonly not exceeding 1 ft. 6 in. in longest diameter.. The grey 
granite (Criffel) is the commonest rock ; but I noticed two of the ‘ Arenig’ 
felstone, one also of a greenish-grey felspathic grit, some of the (not 
numerous) quartz grains being of a bluish colour—probably from Wales— 
and one (at the crossing of two roads in the village) a minutely crystal- 
line syenite or hornblendic granite, reddish felspar being the predominant 
mineral. I have seen the rock before in collections of erratics. I believe 
it is Scotch, though I think there is a rock something like it in the Carrock 
Fell region. It is certainly of northern origin. 
The following boulders in the Midland ‘Counties are recorded on the 
authority of Mr. Horace Pearce, of Stourbridge :— 
Boulder (10 ft. in circumference, 2 ft, x 10 in, in height) in parish of 
