AIA, WARREN UPHAM, ESQ., M.A., F.G.S.A., ON 
me to bear this interpretation. I know these plateau gravels 
in the north, centre, and south of Hngland, and have mapped and 
described them in the Memoirs of the Geological Survey. They 
are not all of one period, but those which represent the inter- 
glacial stage, or epoch of great submergence, contain no traces 
of man’ or his works*—while the gravel terraces of moderate 
elevation to which the author refers as containing these works 
are of much more recent age. I am, therefore, unable to accept 
Mr. Warren Upham’s views as regards the age of the appearance of 
man. This I regret: at the same time I am glad to have had so 
favourable an opportunity for stating the conclusions at which I 
have arrived by many years of observation, and I heartily join in 
thanking the author for his paper. 
I have been asked to endeavour to correlate the glacial 
divisions of time as they are represented in the British Isles with 
those of America as given by the author. There is a great 
difficulty in doing this with much prospect of success, but the 
following may be accepted as approximately correct :— 
GLACIAL DIVISIONS. 
British Isles. North America. 
( Slight re-elevation of land with ) 
increase of cold. Wisconsin Stage. 
Local glaciers in high lands. | (Moderate re-elevation 
FrxaL Stace. 4 Submerged areas overspread > of land and partial 
by waters with icebergs and re-advance of glacial 
| erratic blocks. ice.) 
L (Upper boulder clay.) J 
( Depression and submersion of } 
| land 
MIpDLE STAGE. | Climate moderate. 
(Interglacial.) , Formation of raised beaches 
; and shell beds. 
L (Middle gravels. ) 
( Great elevation of land. 
Champlain subsidence. 
(Fossiliferous marine 
beds.) 
Towan = Stage. 
Helvetian _,, 
Kansan uF 
Ozarkian As 
se Se 
enep AT PAGE | Maximum of cold and exten- 
Ge in 7S oe 4 sion of glaciers and _ ice- + 
AES 5“/ | sheets. 
| 
| (Lower boulder clay or “till.”) J 
At the close of the Final and Wisconsin Stage—the relations 
of land and sea gradually approximated to those of the present 
day, with slight oscillations of sea-level and formation of raised 
* Unless the “eolithic” flints of Mr. Bullen be of this period; but 
even so, they would be later than the epoch of the lower boulder 
clay (see ante, p. 223). 
