bn) Aca 
the summit of the trap range of Kilpatrick, and Cochney Loch; nor 
do they appear on those strata which have been upheaved by trap. 
On the side of the road near Cartlane Bridge is an accumulation of 
very large primary and transition boulders without till,. forming a 
kind of escarpment on the brow of a very precipitous bank leading 
to the valley of the Tee. The opposite slope is crowned with beds 
of sand. ‘The level of these beds is stated to be 550 feet above the 
sea. 
Near the source of the Avon isa deposit of sand and gravel 50 feet 
thick; and similar beds occur at Greenock Mains, on the Ayr road 
from Muirk Kirk. West of these deposits, on White Haugh Water, 
are enormous beds of till. Boulders or fragments of compact flesh- 
coloured felspar and reddish porphyries are very rare in this district, 
but are common in the higher parts of Lanark and Ayr, where these 
rocks form dykes or beds in old red sandstone. Mr. Craig has never 
found the slightest trace of the coal-measures north of the trap which 
forms its northern boundary, 
The following is a summary of the author’s observations respect-— 
ing the nature of the boulders at Bell’s Park, and the extent to which 
they have been scratched :— 
Greywacke, similar to that which is associated with slate near Rose 
Neath, and mica-schist above Lass on the borders of Loch Lomond. 
Blocks very abundant, generally smooth, angles rounded, scratches 
longitudinal, seldom or never crossing each other. 
Porphyritic traps and basalts are next in abundance ; a few of the 
basalt-blocks are scratched, but none of the porphyritic. 
Granite.—The felspar large-grained ; masses few in number, much 
rounded, very smooth, not scratched. 
Old red sandstone and conglomerate.-—Abundant, much rounded, 
never scratched. ‘The conglomerate blocks are very like a variety 
near Glen Sannox m Arran. 
Quartzose rock.—Blocks not abundant, very smooth ; more rounded 
than any other, not scratched. 
Coal sandstone.—Blocks angular, scratched longitudinally. Frag- 
ments of iron-stone rare and angular, but smooth. 
Carboniferous limestone.—The masses belonging to this forma- 
tion are next in abundance to those derived from the traps. When 
large they are much scratched longitudinally and transversely ; and 
the angles are sharp. 
“ A note by Mr. Murchison on a Section and a List of Fossils from 
the State of New York,” by James Hall, Esq., was likewise read. 
Mr. Murchison says, that in consequence of the researches of Mr. 
Featherstonaugh, Mr. Conrad, Mr. Hall, Mr. Vanuxem, Mr. R. C. 
Taylor, and other geologists, large tracts in the British colonies in 
North America and in the United States have been for some time 
known to be composed of formations containing Silurian, old red 
sandstone and carboniferous fossils. Mr. Hall’s section, presenting ~ 
a tabular view of the succession of formations, commences with the 
red sandstone of Blossburgh in Pennsylvania, proved to be the repre- 
