Reviews — Geological Survey of Scotland. 85 



IV, — Geological Survey of Scotland. 



The Geology of the Fannicu Mountains and the country around 

 Upper Loch Maree and Strath Broom. By Dr. B. N. Peach, 

 F.R.S., Dr. J. HoRNE, F.R.S., the late W. Gunn, C. T. Clougu, 

 M.A., and E. Greenly ; with contributions by L. W. Hinxman. 

 B.A., T. I. PococK, M.A., and C. B. Crampton, M.B., and 

 Petrological Notes by Dr. J. J. H. Teall, F.K.S. 8vo ; pp. viii, 

 127, with 8 text-illustrations and 6 {dates. Edinburgh : printed 

 for His Majesty's Stationery Office, 1913. Price 2s. 6d. 



ri1HE region described is one of mountains and lochs, with a little 

 X of the open sea of Gruinard Bay on the north-west. Deer 

 forests occupy most of the land, the only cultivated areas being along 

 the sea-coast, the lower parts of Straths Beg and Broom, and at the 

 mouth of Kinlochewe Kiver. The more familiar tracts are those along 

 Loch Maree, the portion included being about 9 miles in length, 

 with the Loch Maree Hotel at Talladale and Letterewe on the 

 opposite coast to the E.N.E. 



The geological features are clearly shown on the colour-printed 

 map, Sheet 92 (price 2s. 6d. net). On the west are large tracts of 

 Lewisian Gneiss and Torridon Sandstone, overlain towards the east 

 by unconformable Cambrian rocks. It is pointed out that "the 

 present outlines of the Lewisian Gneiss are, to a considerable extent, 

 a renewal of the pre-Torridonian land surface, which can be shown 

 to have been one of high relief". Thus the Torridonian mountain 

 of Slioch, which attains an elevation of 3,217 feet, comprises nearly 

 horizontal beds of sandstone, which " are seen to envelop three 

 prominent hills of Lewisian Gneiss — one over 2,000 feet in height 

 — with intervening valleys". Some parts of the area may be 

 a restoration of the pre-Triassic land-surface. llocks of Triassic 

 and Liassic age occur over a small tract on the borders of Gruinard 

 Bay. As at Applecross, they are faulted against the Torridon 

 Sandstone, and the local downthrow is estimated at about 1,000 feet. 

 From Little Loch Broom southwards the Torridon Sandstone forms 

 a fine series of terraced escarpments with corries, as at An Teallach 

 (shown on plate vi), where there are five peaks more than 3,000 feet 

 in altitude. Cambrian quartzites form a prominent escarpment 

 along the eastern exposed area of Torridon Sandstone, and then the 

 ground is greatly disturbed by thrusts and disruptions ; a belt of 

 complication due to post-Cambrian movements crossing the area from 

 Loch Broom on the north to the head of Loch Maree and beyond on 

 the south. 



The eastern half of the area bordering this region of great disturbance 

 is formed mainly of the Eastern Schists or Moine Series. It "forms 

 part of the Highland plateau, running along the main watershed 

 of the country, which has been deeply trenched by river systems 

 developed since Eocene times". Here is found " some of the wildest 

 scenery in Central Koss-shire ". Flaggy siliceous schists and massive 

 muscovite-biotite-gneiss form lofty escarpments and precipitous corries, 

 as exhibited in Fannich Forest (plates i, iv, and v). The Fannich 

 Mountains, which rise to the north of Loch Fannich, include eleven 



