228 Fieports and Proceedings : 
he finds to be, as he had conjectured, part of the occipital bone of 
man. From these facts M. Morlot inferred that at three successive 
epochs the action of the torrent spread the reliquie of human oc- 
cupation over the growing delta of La Tiniere,—that the epochs may 
be approximately calculated at 1600, 8800, and 6400 years ago. 
And he refers these dates to particular points in the ‘Roman,’ 
‘ Bronze,’ and ‘ Stone’ periods ; so that the earliest trace of man 
in this delta is between 6000 and 7000 years old. No stone imple- 
ments occurred in this mound. ‘The age of the whole mound is 
estimated at 10,000 years. M. Morlot also applied the same method 
of computation to the earlier and larger conical mound of La Tiniere, 
which was deposited while the Lake of Geneva was maintained at’a 
higher level. ‘The result gives for this cone one thousand centuries ; 
and M. Morlot regards it as a fair approximation to the length of 
‘Post-glacial’ time—the term ‘ Post-glacial,’ as we employ it in 
England, being supposed to agree with the end of the last great 
extension of ice in the Alps. 
On Guactat Distribution or Granite Biocxs. By Professor Purrres, F.R.S. 
Bes more than thirty years the attention of the author has been 
earnestly fixed on the remarkable facts which have been ob- 
served by Professor Sedgwick and himself in regard to the dispersion 
of granite blocks, from Wasdale Craig, over high and low ground 
across Yorkshire and certain tracts of neighbouring counties. While 
in the drainage of the Eden and the large tracts embraced by the 
northern and eastern branches of the Humber, and the long depres- 
sion on the western side of the Carboniferous chain of Yorkshire 
and Lancashire, these blocks occur even plentifully, they are quite 
unknown in every part of the country to the westward of the parent 
rock. In tracing the course of the blocks from the extreme south- 
east of Yorkshire back to their origin, it is found that they by no 
means follow the valleys and avoid the heights, but that, on the 
contrary, with little or no difference, they occur alike on hills and 
dales, though not on the very highest, until on Stainmoor, at the 
extremity of Yorkshire, they appear on surfaces raised 1,400 feet 
above the sea. Through this Pass of Stainmoor, which, though so 
much elevated, is in fact a great transverse depression in the Car- 
boniferous chain, the blocks have passed on through a strait of an 
ancient sea. At no other point have the blocks crossed the chain. 
Turning now to the west, we remark that in all the intermediate 
country, whether elevated to about 1,000 feet above the sea, or only 
to about 500, blocks of the granite are frequent; and on approach- 
ing the site from which all have passed, they grow so numerous as 
even to be counted by hundreds and thousands. 
The blocks are often of very large size: some within two or three 
miles of the Craig are 12, 14, 18 feet, and even more, in the largest 
dimensions; and at Thirsk, 70 miles off, a block was found 13 feet 
in diameter. ‘They seldom appear to have been rolled, but yet, 
perhaps by ordinary surface-waste, they have often become blunted 
at the angles. On the whole, the author is convinced, by his 
