Reports and Proceedings. — a7 
and polished stones of all sizes, but totally devoid of fossils, and that 
it is, in fact, the true old Boulder-clay of the geologists of the West 
of Scotland. ‘The Shells are entirely confined to a bed of clay of 
open texture, containing afew small stones ; it rests immediately on 
the Boulder-clay, as above defined, and is succeeded by various drift- 
beds, consisting of seams of clay and sand intermingled, containing 
stones that are rarely striated, and without Shells. Dr. Bryce then 
discussed the probable origin of these drifts, and the amount of 
depression which the land had sustained before the Shell-bed was 
deposited over the Boulder-clay, which he considered to have been 
formed by land-ice emanating from central snow-fields, and covering 
the whole surface of the country. 
3. ‘On the Occurrence of Beds in the West of Scotland in the 
position of the English Crag. By James Bryce, M.A., LL.D., 
F.G.S.—In consequence of the results arrived at from the investiga- 
tion of the Drift-beds of Arran, Dr. Bryce determined to examine 
all the recorded cases of fossils occurring in the Boulder-clay, the 
Chapel Hall case having, however, been already undertaken by the 
Rey. H. W. Crosskey. The most celebrated case is that of the 
occurrence of Elephant-remains at Kilmaurs, near Kilmarnock, in 
Ayrshire ; and the author showed, from a section of the quarry 
exposed for the purpose by Mr. Turner, of Dean Castle, which cor- 
responded exactly with one already furnished to him by an aged 
quarrryman, that the Elephant-remains, the Reindeer’s horn, and 
the Shells, all occurred in beds below the Boulder-clay, and not 
in that deposit, as has always been stated. ‘The same conclusion 
was arrived at respecting the occurrence of Elephant-remains at 
Airdrie and Bishopbriggs, and of Reindeer’s horn with Shells at 
Croftamie; and the author concluded by discussing the question 
whether the fossils belong to the Upper Crag period, or merely indi- 
cate a downward extension of the Arctic fauna which charac- 
terises the beds directly above the Boulder-clay, as described in 
the last paper. 
4 *On the Tellina proxima Bed at Chapel Hall, near Airdrie.’ 
By the Rev. H. W. Crosskey. Communicated by Dr. Bryce, F.G.S.— 
One of the most perplexing cases in Scotland, upon any theory of 
the formation of Boulder-clay, has been the alleged occurrence at 
Chapel Hall of a clay-bed containing Yellina proxima, intercalated 
between two masses of true Boulder-clay. ‘The Shelis were first 
found by Mr. James Russell in sinking a well; and the case was 
made known by Mr. Smith, of Jordan Hill, in a paper laid before 
the Geological Society in 1850. At the author’s request, Mr. 
Russell had sunk another well seven yards from the former, from an 
examination of which Mr. Crosskey satisfied himself that the bed 
above that containing the Shells is not the true Boulder-clay, but 
an Upper Drift, and that the Shells occurred in a hollow of the 
lower clay, or true Till, filled up with a clay-deposit of an age inter- 
mediate between that of the other two. He therefore considers 
that this can no longer be regarded as one of fossils occurring 
in the true Boulder-clay. 
