PROCEEDINGS-PERTHSHIRE SOCIETY OF NATURAL SCIENCE. lxXV 
(i) Geological Notes, by Mr. Reid. 
At Buchanty Brig the recession of the Fall for some ioo yards or 
so is well marked by the many submerged pot-holes and other 
evidence. Some very fine pot-holes are now to be seen surrounding 
the Fall itself. The pebbles of the Old Red Sandstone Conglomerate 
here are mainly igneous, being apparently derived from the 
“ porphyrite ” massif on the Fendoch Burn, fragments of the 
amygdaloidal top of this flow being not infrequent. On the Millrodgie 
Burn the section exposed shows first a well-marked ash, followed by 
a fault breccia, where the great Highland Fault crosses the burn; 
here too apparently is a mass of Old Red Sandstone caught in the 
fault. Then follows a close grained quartzite of the H.M.S., cut 
through by an east and west basaltic dyke, after which appears a 
narrow band of slate, which thickens out towards the east. 
Following the river section towards Dallick Brig, after passing over 
a considerable thickness of Old Red Sandstone Conglomerate, with a 
dip of about 40 deg., E.S.E., the fault is passed over without any 
available exposure near it, and the first beds of the H.M.S. exposed 
are found to be coarse roughly foliated altered grits, almost vertical 
with a high dip to N.W .; these are followed by a thin band of slate 
(with partings of grit), and for some distance the altered grits and 
quartzite are seen “striking” across the river in a N.E. and S.W. 
direction, till a short way below Dallick Brig, the river, by a sudden 
bend, runs along the line of fault, and we have the Old Red Sand¬ 
stone Conglomerate on the right bank, with the Metamorphic Series 
on the left bank. Here the pebbles in the Old Red Sandstone 
Conglomerate are almost entirely quartzites and altered grits. Under 
Dallick Brig the percolating water, acting upon the mortar, has 
formed a fine crop of small stalactites, some of them over a foot in 
length. 
(2) Botanical Notes, by Mr. Barclay. 
Starting from Buchanty Bridge, the botanical members followed 
the left bank of the river as far as Dallick Bridge. There was a 
profusion of plants in flower, but nothing was seen of special note. 
One or two of the commoner alpines were observed, e.g., Alcliemilla 
alpina and Saxifraga aizo'ides , but the nature of the banks at this 
part was not favourable for enabling such plants as might be brought 
down from the hills to make a lodgement. From Dallick Bridge 
the party returned by road to Buchanty, deviating here and there to 
explore such marshy spots as they fell in with. In one of these was 
found a fine clump of that handsome and rather rare sedge, Carex 
iriigua , and this was the best find of the day. Pucedamim 
Ostruthium , the Masterwort, an introduced plant formerly recorded 
at Buchanty, was found to be maintaining its ground. 
4. On 22nd June the Society again visited Balruddery Den, on 
the kind invitation of Mr. J. Martin White, M.P., for the purpose of 
further examining the beds of fossiliferous shale, of Old Red Sandstone 
age. About 20 Members were present. Mr. R. Dow, Longforgan, 
who acted as leader and local guide, has sent the following report:— 
