172 Reviews — The Geology of Dartrtioor. 



Oligocene, Cambrian and Lower Ordovician. It may be remarked 

 that tlie general appearance of the map is excellent, and it owes 

 much to the careful preparation and drawing of the geological lines 

 by Mr. H. S. Selden, who has utilized the published maps and 

 important contributions from many geologists, whose labours and 

 assistance are fully and cordially acknowledged. The map is divided 

 by parallels at intervals of 4° and by meridians at intervals of 6°, and 

 the enclosed spaces are designated by letters and numbers. These 

 index divisions are utilized throughout the text to denote areas 

 described, so that reference to the map is greatly facilitated. 



Further, a number of sketch-maps are given in the text to show 

 the distribution of igneous rocks, of Pre-Cambrian, Silurian, Devonian, 

 Upper and Lower Cretaceous, and other main divisions. 



In the text, as remarked by Mr. Bailey Willis, "The material 

 selected comprises discussions of stratigraphy, some citations of 

 fossils, and some views on correlation. The aim has been to state 

 stratigraphic facts as fully as the data available or the scope of the 

 work permit and to include as much as space allows relating to 

 faunas and correlation." 



This is but a bald statement of contents. The work, in fact, is 

 a compendium of North American geology, with a bibliography of 

 the stratigraphy containing references to 953 published books and 

 papers and a capital index. All formations and local divisions in all 

 districts on the mainland and in islands from the Pre-Cambrian to the 

 Pliocene are described so far as possible. The Quaternary deposits 

 are not dealt with, but on the map there is one tablet for alluvium, 

 lacustrine and desert-basin deposits, Glacial Drift (in small part 

 only), and beach, dune, and marine deposits of the Atlantic and Gulf 

 coasts; and these are shown only where the underlying formations 

 are completely concealed. 



III. — The Geology of Dartmoor. By Clement Reid, G. Bakeow. 

 R. L. Sherlock, D. A. MacAlister, H. Dewey, and C. N". 

 Bromkhead; with contributions by J. S. Flett and W. A. E. 

 UssHER. 8vo ; pp. vi, 102, with 2 plates and 17 text-illustrations. 

 Printed for His Majesty's Stationery Office, 1912. Price 2s. 2>d. 



rpHE area described Iti this memoir includes the central and greater 

 1 part of Dartmoor. Cranmere Pool, a peaty hollow, noted as 

 being in the centre of the region from which the Dart and other 

 rivers radiate, is on the northern margin of the map ; Sheepstor and 

 the famous Burrator reservoir for the water-supply of Plymouth, 

 Ditsworthy Warren, and Buckfastleigh Moor occur along the southern 

 margin of the map. This large tract of granite is full of interest from 

 scenic, antiquarian, and geologic points of view., Apart from the tors, 

 the many standing stones, hut circles, tumuli, and even the old stone 

 tramway made for the conveyance of granite from Haytor Quarries, 

 are objects that are well calculated to arouse the attention of visitors. 



Although upland peat-mosses are said to occupy most of the land, 

 above 1,600 feet, to the north-west of the Princetown and Moreton- 

 hampstead road, only the alluvial or ' basin-peats ' are coloured on 



