416 Reviews — Geology of Derby, Burton-on- Trent, etc. 



These are, however, minor faults, easily capable of remedy, but 

 detailed perfection cannot be expected from a small and sadl}"^ 

 hampered staff. We must be content with the evident skill and 

 honesty of purpose which has marked the work of the Commission 

 during the year included in this report and in those preceding. 



W. G. 



Memoirs of the Geological Survey of England and Wales. 



III. — The Geology of the Country between Derby, Burton-on- 

 Trent, Ashby-de-la-Zouch, and Loughborough (Explanation 

 OF Sheet 141). By C. E. Fox-Strangways, F.G.S., with a 

 Chapter on Charnwood Forest by Professor W. W. Watts, 

 M.A., M.Sc, F.R.S. 8vo; pp. 83. (London, 1905: E. Stanford, 

 12, 13, and 14, Long Acre. Price 2s.) 



THE area described in this memoir contains a number of small 

 inliers of pre-Cambrian rocks belonging to the Charnwood 

 Forest complex, which are dealt with by Professor W. W. Watts, 

 who described the pre-Cambrian of Charnwood Forest in the memoir 

 dealing with the region to the south (155). 



The next formation in the succession is the Carboniferous Lime- 

 stone, represented by a few inliers situated on a continuation of the 

 Charnian axis. Although covering only a small area this rock has 

 yielded a large number of fossils, and a list of over a hundred species 

 identified by Dr. F. L. Kitchin is given. Above the limestone are 

 the limestone shales seen at Ticknall, Dimminsdale, and Calke. 

 They have thinned out from 5,000 feet in Derbyshire to some 

 500 feet at Breedon, and are probably still less on the flanks of 

 Charnwood. The Millstone Grit above has been divided into three 

 divisions, which are, however, not very persistent. There is 

 a general diminution in the coarseness of the grains from below 

 upwards, the lower beds being generally conglomeratic, the middle 

 grits, and the upper fine-grained thin-bedded sandstones. The 

 formation contains a plentiful supply of good water, now utilised 

 by Melbourne, Castle Donington, Long Eaton, and other places. 



Much of the detailed information relating to the Coal-measures is 

 reserved for a memoir on the Leicestershire Coalfield. There are 

 here given, however, two tables showing the thickness of the seams 

 and the intervening measures. 



Certain purple marls and breccias with a little sandstone, coming 

 between the Carboniferous and the Trias, are doubtfully referred to 

 the Permian (as in the old memoir) in the absence of evidence to 

 the contrary. 



The Bunter occurs only as pebble-beds in this area, the Lower 

 Soft and Upper Soft Sandstones being either absent or represented 

 by pebble-beds. They are well exposed round the west and north 

 sides of the coalfield, overlapping the beds called Permian, but are 

 not very thick. They are better developed further north, between 

 Bretby and Foremark, where they form the sides of the valleys. 

 The Bunter is followed by the Lower Keuper sandstone and marls, 

 from about 50 to 100 feet thick, thinning towards the north. Beds 



