loo The Irish Naturalist, May, 19 13. 
REVIEW. 
ANTRIM VOLCANIC ROCKS. 
The Interbasaltic Rocks (Iron Ores and Bauxites) of North-east Ireland. 
By G. A. J. Cole, F.G.S. ; S. B. Wilkinson ; Alexr. M'Henry, 
M.R.I.A. ; J. R. KiLROE, A.R.C.Sc. ; H. J. Seymour, B.A., F.G.S. ; 
C. E. Moss, D.Sc, and W. D. Haigh, A.R.C.Sc.I. (Memoirs of 
the Geological Survey of Ireland.) Pp. vi. x 130. Maps, 
6 plates, and 23 text figures. Dublin : H.M. Stationery Office, 1912. 
Price 3s. 
At last this long-expected memoir is before us, and in our opinion the 
officers of the Survey are to be congratulated most highly on their work. 
In a preface by the Director the principles on which the revision 
was undertaken are fully explained, and in the first chapter the same 
writer gives an interesting historical account of the investigation of the 
iron-bearing zone between the lower and upper basalts of the district, 
comparing the deposits with the laterites of tropical countries, and con- 
cluding that " The laterites and lithomarges of North-eastern Ireland 
cannot be connected either with volcanic explosions 
or with accumulations in lakes, but must be regarded as typical examples 
of soils and sub-soils formed under conditions now prevalent, in regions 
of seasonal rains, nearer the equator." 
Mr. S. B. Wilkinson describes the deposits of the northern district and 
concludes that there is no evidence of their pyroclastic origin, but that 
they are the result of deep decomposition in place of the basalt. The 
East Antrim district is described by Mr. A. M'Henry. In the Glenarm 
valley grey bauxite takes the place of red iron-ore, and from included 
quartz crystals and the occurrence of a rhyolitic gravel it is concluded 
that this deposit was formed by the weathering of the Antrim rh}'olites, 
which are therefore thought to be of interbasaltic age. 
The Mid-Antrim area was resurveyed by Mr. J. R. Kilroe. It includes 
amongst others the Parkmore mines, which are still worked on an eight- 
to twelve -inch seam of ore yielding some 40 per cent, of iron. The 
southern district was entrusted to Professor H. J. Seymour, and con- 
siderable interest centres in the famous fossil plant locality at Bally- 
palady. The Lough Neagh clays and lignites are discussed in this con- 
nection, and it is concluded that they were derived by denudation and 
redeposition from the interbasaltic beds. Dr. C. E. Moss gives in chapter 
vi. an account of the fossil plants from Ballypalady and other localities. 
Numerous analyses of the interbasaltic ore deposits follow, and include 
bole (3chre and lithomarge, bauxite, and iron-ores. 
Several excellent colour-printed maps accompany the memoir, 
which is also illustrated by numerous diagrams and photographs. The 
general make-up of the volume leaves much to be desired, the binding 
is clumsy, and the workmanship bad. Several of the photographic 
plates (notably pi. vi.) are cut down so as to leave practically no margin, 
while the ghastly attempt at colour-printing which forms the frontispiece 
would be a disgrace to a halfpennv comic paper 
A. R. D. 
