a) 
Depsh 
No. of from the 
the Bed. Nature of the Bed. Thickness. Surface. 
: Feet. In. Feet. In. 
Mere Darke prowl Clay’ sli. eins wel cee Bares a8 Oe Ges ol 7SK0 
aon eWark clay and black’ sand 2220.0. < 7 0* 185 0 
43. Light brown clay (hard crustevery 6in.).. 44 0 229 0 
44, Hard blue sand-rock (blue clayin lamine). 20 231 0 
4B5 oo NAVAS ISEETTI I ae Sn a nce ERA Gal ee 4 3* 235 3 
OEM MEN ORCA ile aa). ssc No eles odie erate 15 0 250 3 
MMOH ACKAGIAY so tags ii 6S wade ere = che ie im hee ae Sie mn Psy) 0) 
PRO MPMPPRLORVANNCLOVG ihe oe e oye/'e a chepeie ages sick geige 6 30 2600 
SE PROEOMGAY Miao ois ici Ws, etelaiwicie EU ey, Prtueue ove. lL OU” 26F.0 
OB MANNE ALG SAI VP n>. 12). cuss yee, sities itaieh cus «aaa o 0 2660 
A letter, dated Glasgow, January 16, 1841, from Mr. Craig to Dr. 
Buckland, ‘‘ On the Boulder Deposits near Glasgow,’’ was also read. 
The sand- and gravel-beds of the banks of the Clyde are found, 
Mr. Craig states, in many places besides the adjacent districts ; and 
though wherever he has examined them they are superimposed on 
the till, yet he does not know if they always occupy that position. 
At Chapel Hall, at the height of 350 feet, a bone of a Mammoth or 
Mastodon was found in a bed of laminated sand containing quartz 
pebbles with fragments of coal-measures and overlying till. Similar 
beds of sand occur near Eagleham, twelve miles south of Glasgow ; 
and near Galston in Ayrshire, at the height of 500 feet. The sand- 
beds near Toll Cross on the Hamilton road extend nearly to Broom 
House Toll, where they rest on till. East of Glasgow the sands lie 
in the form of a dyke between beds of clay, and extend from the 
river to the College, where they are cut off by the whinstone dyke 
which ranges through the city. On the other side of the Clyde they 
reach as far as Mr. Dixon’s iron-works, but further down the river 
their thickness is not great. At Mr. Smith’s property of Whiteinch 
twelve feet of sand overlie thirty of soft clay and sand. 
The bed containing recent shells at the entrance of the Arkleston 
Tunnel*, near Paisley, is 80 feet above high-water level ; and a simi- 
lar bed at Port Glasgow is 40 feet. In both instances it is overlaid 
by laminated sands similar to those at Toll Cross, and on which the 
greater part of the city is built. Their highest level in Glasgow is 
about the same as that at Arkleston. ~ i 
The boulders are found almost throughout the basin of the Clyde 
where denudation has not taken place subsequent to their deposition, 
except in the elevated trap districts, where they are very rare; the 
only instances mentioned in the paper are the Baker’s Reservoir on 
* At this tunnel a bed of coal is stated to have been changed by trap into 
a bed of pyrites; but a stratum of limestone, though only two feet from 
the trap, is reported to retain its organic remains. 
