Revieios — Geological Survey — Geology of India. 177 



assign these very shape variations with unerring certainty each to its 

 particular zone. 



Another point of interest is the attempt to trace the almost equally 

 instructive variations in horizontal distribution as dependent on the 

 nature of the deposit, the depth, current, and temperature of the 

 Cretaceous sea from Yorkshire to Devon, thereby educing the fact 

 that a fossil which occurs but sporadically in one area may have 

 developed abundantly in another. Regarding other forms like Kingena 

 lima, previously recorded onlj^ from the lower and upper beds of the 

 White Chalk, Dr. Rowe has filled in the gaps and found that at those 

 levels where it is rarest in the southern counties it is commonest in 

 Lincolnshire. He has shown the same with regard to Infulaster 

 rostratus, which appears earlier in Yorkshire than in the south, with 

 Cidaris 2)leracantha, and with many others. 



The work as a whole is stated to be frankly zonal, and therefore 

 zoological ; it is, however, of a very high geological standard, enhanced 

 by the accompanying maps and sections drawn on so large a scale by 

 C. D. Sherborn, which show at a glance the position of every zone, 

 every point of interest, every fold of the beds on the coast. The 

 fifty-six fine photographs taken by Dr. H. E. Armstrong, which must 

 have necessitated so many visits and the expenditure of much time 

 and care, succeed in bringing to the eye in a wonderful manner all 

 the critical zonal junctions of importance in the White Chalk of the 

 English coast. 



The magnificent White Chalk cliffs of England have at last found 

 interpretation worthy of their grandeur and of their teachings. The 

 work of Dr. Rowe and his associates, C. D. Sherborn and H. E. 

 Armstrong, stands as a model for the future, and as a lasting 

 monument of descriptive geology. Chas. Raeeois. 



II. — Geology of India. 



Geneeal Report of the Geological Suevex op India foe 1906, by 

 T. H. Holland, E.R S., F.G.S., Director. The Mineral Production 

 of India during 1905, hj T. D. Latouche, B.A., E.G.S. Numerous 

 papers on Indian Geology by Officers of the Geological Survey of 

 India. — All the above extracted from the " Records." 

 {Concluded from the March Number, page 126.) 



Peteology. 



For some time past the attention of the officers of the Indian 

 Survey, including the present Director, has been di-awn to a remarkable 

 series of rocks found in the Yisagapatam district, and forming 

 a portion of the Eastern Ghauts. By all accounts this region must 

 be a petrologist's paradise : without going too closely into particulars, 

 either petrological or topographical, it may be stated that in this 

 region a great igneous massif with borders of extremely basic rock 

 underlies a development of sillimanite ^ schists, which appear to be 



^ Sillimanite: composition Al303Si02, as for andalusite= silica 36-9, alumina 

 63-1=100. 



DECADE v. — VOL. V. — NO. IV. 12 



