Reviews — Geology of Neicark and Nottingliam. 131 



boulder-bed. Furthermore, the Blaini boulder-bed having been 

 accepted as a reliable horizon of known age, "the sequence of 

 strata below and above it iu the Simla region became distributed 

 accordingly along the standard stratigraphical scale ; those below 

 the Blaini-beds were regarded as Permian or older, and those above 

 as Permian or younger." 



This inference for a time seemed natural, but its acceptance was 

 the cause of much difficulty, arising from the attempt to correlate 

 the fossiliferous strata of Mesozoic and Tertiaiy age on the northern, 

 or Tibetan side o£ the crystalline axis with their presumed 

 unfossiliferous equivalents on the south. It may be noted that 

 more than one Indian geologist has had an eye to the possibility 

 of finding in the Himalaya the counterpart of the great mass of 

 unfossiliferoiis sedimentaries, so largely developed in Peninsular India, 

 known as the PM/-«Hrt- group. As regards the beds above the Blaini 

 boulders at Simla, any such correlation was impossible so long as these 

 boulder-beds were held to synchronize with the Talchir boulder-bed. 



The Director thinks that he sees a way out of the difficulty in the 

 presumption that there has been more tlian one period of glaciation 

 in times preceding the formation of the Talchir boulder-bed and its 

 equivalents in South Africa and Australia. To prove this point he 

 quotes the glacial boulder-beds held to exist below the Cambrian 

 in South Australia, and he also believes that in South Africa there 

 were two periods, preceding the Dwyka, where glacial phenomena are 

 indicated. Moreover, on the coast of the Varanger Fjord, in Norway, 

 glacial phenomena have been described by Reusch and Strahan in 

 a formation which is presumably pre-Cambrian. Thus pre-Talchir 

 boulder-beds are recognized in many quarters, and, whatever may 

 be the value of this recognition as a proof of true glacial conditions 

 in the respective periods, such recognition affords an alternative to 

 the prevailing theory that the Blaini beds must be of Upper Car- 

 boniferous age. Hence the geologist will have a free hand in dealing 

 with the unfossiliferous series above the Blaini formation at Simla. 

 W. H. H. 



II. — The Geology of the Country between Newark and Nottingham. 

 By Gr. W. Lamplugh, F.R.S., W. Gibson, D.Sc, R. L. Sherlock, 

 B.Sc, and W. B. Wright, B.A. pp. vi, 126, with six text- 

 illustrations and one plate of sections. 1908. Price 2s. 3^^. Colour- 

 printed map, Sheet 126; price Is. &d. 

 rPHE eastern side of the area described in this memoir consists of 

 J a belt of Lower Lias, with a gentle escarpment between Newark 

 and Barnstone, along which the Rhsetic beds outcrop. The central 

 portion, occupied mainly by the Keuper marls, is traversed by the 

 River Trent, which on its right impinges against the marls at Radcliffe 

 and along the Trent Hills. To the west the ground is formed of 

 Keuper waterstones and Bunter pebble-beds and sandstone, which 

 extend from Nottingham northwards into Sherwood Forest. On the 

 western margin there are fringes of Permian marls and Magnesian 

 Limestone, which rest with marked unconformity on the Coal- 

 measures. 



