﻿RevieiDS — Harrison'' s Geology of Leicester and Rutland. 521 



rocks are developed, and where the phenomena of igneous and 

 naetamorphic action may be well studied. We may add that here, 

 too, we have abundant material for controversy. In the Lower 

 Oolites, the Lias, and in the New Red. Sandstone series, we may 

 seek relief from the puzzles of the older rocks, while the complex 

 history of the Drift deposits furnishes another pleasant subject of 

 dispute. 



Commencing with the Crystalline and Slaty rocks of Charnwood 

 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. Gr. Bonney as a felstone. 



The coarse ashy slates of Broombrigg's Hill are likewise well 

 shown in a photograph, and this neighbouiiiood is stated to contain 

 the most tyjjical 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 Palseozoic rocks, "the old 

 elevation line of Charnwood seems to have bent southwards, 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 

 Leicestershire. 



In describing the Permian and Tnassic rocks, allusion is made to 

 the unconformity between the former rocks and the Coal-measures, 

 and it is likewise pointed out that the Permian and Triassic rocks 

 are unconformable, although "there are no good sections in Leices- 

 tershire to show 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 Rhsetic beds. Lias and Oolites, 

 and of the various gravels and other Drift 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 Leicestershire. 



Rutland, until very recently, says Mr. Harrison, was quite a 



