Reviews — Geological Survey of Scotland. 561 



A manuscript of this nature is necessarily imperfect for any one 

 genus until the whole literature has been gone through. As far as 

 possible it is compiled from 1758 upwards, but often a side issue 

 takes the compiler on even into the present year. Every book 

 when completed is ticked off in some well-known Catalogue, and 

 a catalogue slip is made, so as to allow of an alphabetical register. 



It is believed that the plan adopted for preparing an " Index 

 Generum et Specierum Animalium " is so arranged and so carried 

 out that the work is completed day by day so far as it goes, and that 

 it would be easy for any individual to continue the carrying out of 

 the scheme to-morrow should there be occasion to do so. 



BEVIE W S. 



I. — Geological Survey of Scotland. Explanation of Sheet 75 of 

 the Geological Survey Map — including West Aberdeenshire, Banff- 

 shire, parts of Elgin and Inverness. By Lionel W. Hinxman, 

 B.A. ; with Penological Notes by J. J. H. Teall, M.A., F.R.S. 

 8vo, pp. 48. Price Is. 6d. (Edinburgh : Printed for H.M. 

 Stationery Office, 1896.) 



THE area described in this memoir is a mountainous one. A 

 small portion of the Spey Valley lies to the north-west by 

 Cromdale, and a group of metamorphic rocks developed in and 

 around the Haughs of Cromdale and the Braes of Abernethy is 

 noted as the " Cromdale Hills Series." The rooks represent a set 

 of alternating shales and sandstones which have been converted 

 into micaceous and siliceous schists and flagstones. They are 

 thoroughly granulitized, and their sedimentary origin is only 

 occasionally to be recognized in the dark laminae, which under the 

 microscope are found to be composed of heavy residues such as 

 ilmenite and zircon. In addition to the granulitization, the original 

 mineral particles are drawn out in one determinate direction, giving 

 a striped appearance to the rock in many places that at once 

 catches the eye. 



The central portion of the area, east of Glens Lochy and Loin, is 

 occupied by metamorphic rocks grouped as the "Banffshire Series," 

 which includes quartzite (showing in places "rod-" and "mullion- 

 structure"), black schists, mica-schists, slates, and limestone. The 

 original bedding-planes in the limestone are generally recognizable, 

 but the rocks are often intensely crumpled and folded, while 

 additional planes of schistosity have been developed in several 

 places. Overlying these old rocks there are, as at Tomintoul, out- 

 liers of Lower Old Red Sandstone. At Cam Meadhonach there is 

 upwards of 500 feet of conglomerate belonging to this foi'mation. 

 No organic remains have yet been discovered in the Old Red strata, 

 which include sandstones as well as breccia and conglomerate. 

 Various glacial phenomena are described, and there are notes on 

 peat and alluvium. 



DECADE IV. VOL. III. — NO. XII. 36 



