1905-1906.] 
327 
fields. Subsequently we ascended the Cave Hill, and found a 
small deposit in the hollow behind M'Art’s Fort, more than a 
thousand feet above the sea, containing erratics of flint and 
several foraminifera, but the loftiest record fell to Mr. Stewart, 
who discovered fossiliferous boulder clay between 1,300 and 
1,400 feet on Divis Mountain! 7 8 
In the recent geological survey memoir of the drifts around 
Belfast, published in 1904, we are told of Lake Belfast, 8 a vast 
expanse of fresh water, formed during the waning of the glacial 
period by flood waters from melting ice in the Lagan Valley 
dammed back by a barrier of ice that still existed across the 
head of our present Lough. The waters of this lake escaped 
y the Dundonald Valley, emptying themselves into Strangford 
3 „ The S ravel P Jt at Longhurst, XXVI., Neill’s Hill, 
XXI Morrison’s Sandpit, XXIII., and other deposits of Dun- 
onald Valley, XXIV., all belong to this late glacial period 
Possibly these southerly floods bore along much floating ice 
winch may partially explain the occurrence of many rocks from 
he Mourne districts in the Belfast drifts, in the Dundonald 
sands and gravels, and along the wave-worn boulder clays of 
Strangford Lough, where they are mingled with granites from 
omeroy, Slieve Gallion, and Slieve Croob, rhyolite from Tard- 
ree an eurite from Annalong, one unique specimen embedded 
in boulder clay at Castle Espie, XXVIII., being identified by 
. enry as a primary conglomerate occurring in Cavan, 
Monaghan, and Armagh, We found Castle Espie limestone as 
an erratic southward as far as Killough, where our geological 
sec mn eld a pleasant Christmastide excursion in 1897. This 
Killough deposit of stiff boulder clay and conglomerate, partially 
urne to calcrete, occurs close to Silurian rocks, whose splendid 
g aciation disappears below the waves; yet no microzoa were 
found in the clay from this section, although the spray is 
7. The O« ot Boulder Clay on Divis. Proc. B.N.F.C. ( 2 ), IV.. p. 
8 . The G - O 3 p °%tte 6 0ountry Around Belfast. Mem. Geol. Surv. Irel. 
