276 Memoirs—C. Barrois—Fauna of the Erbray Limestone. 
increases as time goes on, so that it is deeper down now than ever 
it has been before. 
It is obvious that the amount of compression which can be got 
out of a superficial shell certainly not more than two miles thick, 
and probably much less, the compression gradually diminishing and 
coming to an end at that depth, can have produced scarcely any 
appreciable folding. We must therefore look in some other direction 
for the cause of rock folding, thrust planes, and other phenomena of 
that nature. The probability is that the theory of the earth being 
solid throughout is incorrect. 
NOTICES Of MEHMOLES.- 
I—Rxcorps or tHe Grotocica, Survey or New Sovurm Wats. 
Vol. I. Part I. Department of Mines, Naser 1889.  8vo. 
31 pp. and Plates i.—iv. 
S a significant indication of the increasing interest in geological 
science in New South Wales, it gives us pleasure to call 
attention to the first part of a new periodical, issued under the 
auspices of the Geological Survey of that colony, in which it is 
intended to record the discoveries and observations in the geology, 
palzontology and the mineral deposits of the country. The part just 
issued contains seven papers on a great variety of subjects, amongst 
which may be noticed ‘Notes on the Geology of the Barrier 
Ranges District and Mount Browne and Tibooburra Goldfields, by 
C. 8. Wilkinson, F.G.S., Geological Surveyor in charge’; ‘ Report 
on the Discovery of Human Remains in the Sand and Pumice Bed at 
Long Bay, near Botany,’ by T. E. David, F.G.S., and Robt. Etheridge, 
jun., and ‘On a Coral intermediate in structure between the Genera 
Lonsdaleia and Spongophyllum, etc.,’ by R. Etheridge, jun. 
Gadegrle 
I].—Faune pu Catcarre D’Erpray (Lorre InFirinure). Par 
Cuyarues Barrois. Contribution & Vétude du Terrain Dévonien 
de ’Ouest de la France. Extrait des Mémoires de la Société 
géologique du Nord, tome iii. Avril, 1889. pp. 884, pls. i.—xvii. 
ROM the beds of limestone quarried near the small town of 
Erbray (Loire inférieure) a comparatively rich fauna was 
obtained by M. Cailliaud in 1861, who compared it with that of the 
Bohemian étage F., the so-called third Silurian Fauna of Barrande, 
and it has since been regarded as the sole representative of this 
particular division in France. This conclusion is now called in 
question by Dr. C. Barrois, who has made an exhaustive study of 
the fossils from these rocks, and described and illustrated them very 
fully in the present memoir. The limestones yielding the fossils 
occur as discontinuous lenticular masses in a series of fine argil- 
laceous schists, which are unfossiliferous and estimated to be from 
800 to 1000 metres in thickness. Dr. Barrois recognizes three 
distinct levels in the limestones, each marked by particular litho- 
aia 
ce cv 
peace 
Pa. 3 
