Jtemeivs — B. Lindemann — Granular Carbonate Bocks. 613 



Ussher, F.G.S., and the block annexed, are taken by permission from 

 the letterpress issued with the last set of the first published series 

 of "British Geological Photographs " : — "The natural arch depicted 

 in the photograph forms a conspicuous object on the south coast 

 of the Torquay Promontory between the Bath Saloons and Daddy 

 Hole. It has been tunnelled by the sea through a small headland 

 near the axis of an inverted synclinal curve in Middle Devonian 

 Limestones. The prolongation of this axis eastward is well 

 shown on the coast a quarter of a mile away. In the middle 

 and lower part of the limestone masses of Torquay, a partial 

 cleavage is often displayed by the beds, consequent on the pressure 



Diagram figure of Natural Arch, Torquay ; drawn to show inyerted Syncline. 



which has produced the folding in them ; this structure, as shown 

 in the photograph, becomes in certain cases most pronounced at 

 and near the axis of the folds, causing a shattering of the rock at 

 the point where the direction of strain cleavage approximates to, 

 or coincides with, the inverted bedding planes. The dark marking 

 extending horizontally on either side of the arch in the photograph 

 denotes high-water mark. The railings give a scale. Tiiis locality, 

 from a slightly different point of view, has been figured in the 

 Memoir on the Geology of the Country around Torquay, p. 49 

 (Mem. Geol. Surv., 1903), in which the Middle Devonian Limestones 

 of that district are also described." 



II. — On some important occurrences of Granular Carbonate 



KOCKS, WITH SPECIAL REFERENCE TO THEIR OrIGIN AND STRUCTURE. 



By Bernhard Lindemann. Neues Jahrbuch f. Min. Geol. u. 

 Pal^ont. XIX Beilage Band (1904), Heft 2. 



THIS important paper on crystalline limestones and dolomites 

 contains about 9 pages of bibliography, 5 or 6 pages' of review 

 of older theories of crystalline carbonate rocks, nearly 100 pages 

 of descriptions of special occurrences, and 10 pages of discussion of 



