146 REPORT—1883. 
31. Subangular, worn. Sandstone. 1 ft. 1 in. x 1 ft. x 11 in. 
32. Rounded and worn. Iron-stained, coarse-grained sandstone. 
it. < it. x m. 
The evidence at present collected goes to show that in the district 
referred to the erratics are generally distributed over the country without 
reference to its elevation, and reaching a height of more than 500 ft. 
above sea-level—the highest hills being capped with boulder clay con- 
taining large boulders. It is also clear that as a rule the boulders of all 
sizes, up to the largest known, are derived from the oolites and lias, pro- 
bably of the Midland Counties, but that in addition there is a fair sprink- 
ling of older rocks from further north. Carboniferous limestone and 
millstone grit supply here and there a boulder of large size. Dark blue 
basalt is also not uncommon, and is occasionally found in blocks of a fair 
size. Granites are rare—two specimens only having been noted. 
Nore.—The large boulder at Royston, referred to in the 5th Report, 
1877, p. 84, has been more fully described in the ‘ Transactions of the Wat- 
ford Nat. Hist. Society,’ vol. vi. p. 249. 
Anglesey.—Professor Bonney, F.R.8., sends the following report :— 
A visit to the district south-west of Ty Croes enables me to add 
to the number of picrite boulders already recorded (‘Quart. Jour. Geol. 
Soc.’ vol. xxxvii. p. 137, and vol. xxxix. p. 254). From Ty Croes station 
a road runs south-west. Taking first turn to the right, after crossing a 
field, I found in a field to right of the lane a fragment of a boulder 
(measuring by estimate about 2 ft. x 1} ft. x 14 ft. of picrite of the ordinary 
type described in the above papers. About half-way between this spot 
and a farm-house seven fragments of a large boulder are built into the 
wall by the roadside: three of these are quite 2 ft. in diameter, the rest 
smaller. Outside the buildings of a second farm along the same lane are 
two fragments of picrite, the larger about 34 ft. x 25 ft. x 14 ft. ; the longest 
diameter of the other being about 2} ft. On the sandy shore at Porth 
Noble, some distance to the north of the boulder described in the second 
of the above papers, lies a large subangular boulder of the usual picrite, 
measuring about 4 ft. x 4 ft. x 2 ft. On my return by the Frondwl specimen 
I found fragments of another picrite boulder about 80 yards nearer the 
church, built into the base of the wall (vegetation will generally conceal 
these). On looking again at the boulders in the Cromlech Barclodiad-y- 
gawras I felt some doubt as to the correctness of my former identification 
of picrite (‘ Loc. Cit.’ vol. xxxix. p. 254), but without injuring the stones 
it is difficult tobe sure. Itis, however, evident that, at any rate in this part 
of Anglesey, boulders of hornblende-picrite are rather common. I may add 
that during a stay of a few days at Penmaenmawyr I did not see a single 
picrite boulder, though erratics are abundant, as there is boulder drift on 
the lower ground. 
