1864. - The Geological Society. 295 
several pages to the endeavour to prove the authenticity of the flint 
implements, appends a postscript to his communication for the purpose 
of stating that he is now convinced of their fraudulent nature,—an 
opinion, by-the-bye, which he originally held. So also Dr. Falconer 
and others have first been advocates of one view, then of the other, 
and sometimes have gone back again to their original opinion. 
Setting aside the jaw and the flint implements, Mr. Prestwich’s 
paper has an independent value, on account of the lucid discussion it 
contains respecting the manner in which the gravels of the Valley of 
the Somme were deposited. The author gives theoretical sections of 
the valley at the time of the formation, and at that of the emergence, 
of the high-level valley-gravels, as well as at the time of the formation 
of the lower-level valley- gravels, and an actual section of the valley at 
the present time; he thus shows that the high-level gravels are the 
older ; that the valley has been chiefly formed by the river itself, from 
which also and from floating ice the gravels and loess were deposited ; 
and that, whatever difference of opinion may exist respecting certain 
flint implements, others, the genuineness of which cannot be questioned, 
have been found in situ from time to time during the last fifteen years, 
in some of the oldest of the high-level gravels of the ancient Valley of 
the Somme. 
8. The geology of the Eastern Archipelago is illustrated by three 
papers, two of which, namely, “On the Geology and Mineralogy of 
Borneo and the adjacent Islands,” by M. de Groot, and “ Notes to 
accompany some Fossils from Japan,’ by Captain Bullock, are merely 
explanatory notes sent with specimens, while the third—‘‘ On some 
Tertiary Mollusca from Mount Séla, in the Island of Japan,” by Mr. 
H. M. Jenkins,—is a description of some of the specimens referred to 
in the first-named communication. 
As Mr. Jenkins observes, Java has hitherto been a terra incognita 
to the geologist, and it is therefore interesting to have, at last, a definite 
age assigned to some of the Tertiary beds of that island, with the data 
before us upon which the conclusion rests. The author considers the 
fossils he describes to be of late Miocene date, though they have until 
now been considered Eocene, but not upon any very tangible grounds ; 
he also discusses several questions arising out of a consideration of 
these Javan specimens, endeavouring to show that some portion of the 
so-called Nummulitic formation of India is also Miocene, in this view 
being supported by Dr. Duncan in a note on the Scindian fossil corals. 
He also advances the hypothesis, not without a certain amount of 
evidence in favour of it, that the Miocene fauna of the middle and 
south of Europe emigrated eastwards into the Indian Ocean. Basing 
his argument upon this view he strives to show that, with a representa- 
tive fauna (on the principle enunciated by Professor E. Forbes), a 
series of Tertiary beds in the east would be newer than their apparant 
equivalents in Europe—a conclusion which is very important if it be 
true, but which at present requires confirmation; the same may also 
be said of the assertion that a tropical representative of the Pliocene 
formation of Europe could not be distinguished from a late Miocene 
formation. 
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