BANKS OF THE TWEED AND SOME OF ITS TRIBUTARIES. 547 
30 feet above the sea. The top of the hill presents a large flat area of sand- 
stone rocks, rising gently to the N.W. Portions of these rocks bear deep 
strize, the direction of which is N. } W. by compass. On many parts of this hill 
surface, there are boulders of the various Cheviot porphyries. My companions 
(Mr Hueues of Middleton Hall, and Mr Harpiz, Secretary to the Berwick- 
shire Naturalists’ Club) who guided me to the moor, are well acquainted with 
the Cheviot rocks. They pointed out to me Hartsheugh and Watch- 
law as the hills from which these boulders had come. The distance between 
these hills and the present site of the boulders, is about 23 miles “ as the crow 
flies,” But Wooler valley intervenes, the bottom of which is about 320 feet 
beneath the position of the boulders. The width of the valley is about one 
mile, with hills on each side, so steep, that it is impossible that any boulder 
could have been pushed or rolled up. The boulders must therefore have some- 
how been carried across this valley, from the parent hills, to their present 
positions. 
I understand that in Chillingham Park, situated about 5 miles to the E.S.E. 
of Wooler, there is a large boulder of red porphyry containing mica, which 
Mr Harpiez says must have come from ‘‘ High Cheviot,” as that hill alone, 
he believes, has rock in it of this description. The valley of the Till lies west 
of Chillingham, so that this boulder must have crossed both Till valley and 
Wooler valley, to reach its present position. 
The direction in which these Cheviot boulders have come was from west, or 
W. 4S. (magnetic.) 
Near Doddington, there lie blocks of a peculiar porphyry, which Mr 
HARDIE considers to have come from near Yetholm, about 6 miles to the west. 
It will be observed, that this direction does not agree with that of the strize 
on the sandstone rocks, of Fowberry Moor, above mentioned, viz., N, + W. 
To account for the direction of these striz, it may be mentioned, that 
there is a wide opening towards the north, between the Cheviot hills on the 
west and Doddington hills on the east. A current could therefore have flowed 
from the N.4 W. point, and have passed over Fowberry Moor, producing on 
its rocks the striations before referred to. On the surface of the hill, there 
are small boulders of graywacke and blue whinstone, apparently from Scot- 
land. In a direction towards 8.34 E., the country is low enough, to have 
admitted a current to flow on in that direction from the north. 
There is no improbability in the supposition, that if the sea prevailed over 
these hills, there may have been different currents at different periods. 
(3.) The other class of boulders, viz., those from the Scottish Highlands are, so 
far as known, few in number. There is a block of Mica Schist, weighing about 
half a ton, about 3 miles north of Dunse, first pointed out by Mr STEVENSON of 
that town. Several small blocks of a similar rock were found lately in boulder 
