182 Reviews—Sir A. Geikie’s Map of Scotland. 
Keuper Marls and Waterstones at Ruddington, Owthorpe, and 
Edwalton. Detailed descriptions are given of the Secondary 
formations and of the fossils and zones in the Rhetic beds, Lias, 
and Inferior Oolite. The Gypsum in the Keuper Marls, the Lime 
and Cement Works at Barnstone and Barrow-upon-Soar, and the 
Brown Iron-ore of the Middle Lias, form the chief economic products 
in the strata, and a useful map is given to show the distribution of 
the ironstone. Among the plates are good views of the hydraulic 
limestones of Barrow, of a contortion in the same formation (resembling 
a sharp anticline that was to be seen at Rugby), and of an ironstone 
working at Warnatby. 
A full account is given of the Glacial Deposits, and it is noted that 
the authors have been unable to follow the details of Mr. R. M. 
Deeley’s rather complex classification. Three types of Boulder-clay 
are, however, noted, the main Chalky Boulder-clay, a grey clay derived 
mostly from the Lower Lias, and a red silty clay derived apparently 
from the Keuper Marl. The variations in the Boulder-clay and the 
distribution of included boulders are marked on a small map. ‘The 
evidence shows that the ice-flow was mainly from N.E. to 8. W. 
The whole of the area is in the Trent drainage system. The older 
river gravel is considered to represent late Glacial flood-deposits, and 
from them remains of mammoth have been recorded. The newer 
deposits of river gravel and the Alluvium are briefly described, and 
special attention has been given to the soils on the Keuper Marl, Lias, 
and Drift. 
IIJ.—Guotoeican Map or Scorranp. By Sir Arcurparp GEIxrE, 
K.C.B., D.C.L., Pres.R.S. Scale 10 miles to an inch. Second 
edition, with Explanatory Notes. pp. 31. Edinburgh: John 
Bartholomew & Co., 1910. Price 7s. 6d. net. 
IGHTEEN years have elapsed since we called attention to the first 
edition of this map (Grot. Mae., November, 1892); and we now 
welcome a revised edition, which embodies the later published work 
of the Geological Survey. The divisions shown in the Index of 
Colours are practically the same, the Lower Silurian being now taken 
to include Arenig as well as Caradoc and Llandeilo; while the Old 
Red Sandstone, subdivided as before into Upper and Lower, has two 
colours for the lower strata, those north and those south of the 
Grampians. The principal changes in the map are in the Isle of 
Arran, where Trias replaces much area formerly coloured as Old Red 
Sandstone, in the details of Islay, Colonsay, and Gigha, in the country 
between Oban and Inverary, Rannock Moor, and Blair Athole, and on 
the borders of Sutherland and Caithness. A considerable amount of 
geological detail and much topographical information are shown with 
great clearness on the map. The accompanying explanatory notes 
have been amplified, more especially with regard to the Volcanic 
rocks, the Dalradian schists, the Downtonian, and the Old Red 
Sandstone. 
