Reviews — Harrison’ s Geology of Leicester and Ratland. 521 
rocks are developed, and wbere the phenomena of igneous and 
metamorphic action may be well studied. We may add tbat bere, 
too, we bave abundant material for oontroversy. In the Lower 
Oolites, the Lias, and in the New Red Sandstone seines, we may 
seek relief from the puzzles of the older rocks, wbile the complex 
bistory of the Drift deposits furnishes another pleasant subject of 
dispute. 
Commencing witb the Crystalline and Slaty rocks of Cbarnwood 
Forest, Mr. Harrison notices their general structure and arrange- 
ment, describing in detail the principal sections. The granite 
quarries of Mount Sorrel and the syenite quarries of Croft, Huncote, 
Sopewell, Markfield, and Enderby, as well as the quarry at Bardon 
Hill, are represented in photographic plates. The stone of Bardon 
Hill is described by the Rev. T. G. Bonney as a felstone. 
The coarse ashy slates of Brootnbrigg’s Hill are likewise well 
shown in a photograph, and this neighbourhood is stated to contain 
the most typical outcrops of the slates. 
Concerning the age of the old rocks of Charnwood, Mr. Harrison 
observes that they “ may be put down as Lower Silurian [=Upper 
Cambrian of Sedgwick] with certainly as great a degree of proba- 
bility as the theory has which assigns them to Cambrian [= Lower 
Cambrian] Laurentian age.” 
Many points of interest are furnished by the Carboniferous rocks, 
and especially in the structure of the Coal-district. No Coal-measures 
are exposed on the eastern flanks of the Palaaozoic rocks, “ the old 
elevation line of Charnwood seems to have bent soutliwards, and 
passing by Enderby and Sapcote forms a terminal ridge in that 
direction.” But Mr. Harrison briefly discusses the probability of 
finding coal beyond this ridge, in the most easterly portion of 
Leicestersliire. 
In describing the Permian and Triassic rocks, allusion is rnade to 
the unconformity between the former rocks and the Coal-measures, 
and it is likewise pointed out that the Permian and Triassic rocks 
are nnconformable, although “ there are no good sections in Leices- 
tersliire to sliow this.” It is only right to observe that the marked 
break between Permian and Trias which was formerly supposed to 
exist, is now questioned ; while the overlap of the Trias merely 
indicates submergence and in itself affords no evidence whatever of 
unconformity. It may be questioned, too, whether the marks of 
erosion between the Bunter and Keuper are more than local, and 
such as we might expect to occur anywhere in such false-bedded 
accumulations. 
Interesting accounts of the Rhaatic beds, Lias and Oolites, 
and of the various gravels and other Dritt deposits, follow ; there 
are some notices of remarkable boulders, and a plate showing 
glaciated and waterworn rocks at the granite quarry of Mount 
Sorrel. Notices of prehistoric man, of mineral springs, list of 
heights, glossary of technical terms, and records of colliery shafts, 
complete the subject-matter of the Geology of Leicestersliire. 
Rutland, until very recently, says Mr. Harrison, was quite a 
