Revieivs — Dr. A. W. Rowe — Zones of the White Chalk. 309 



An interesting and previously unobserved feature is revealed by. 

 this section of the Carse Clays : an upper bed of trees and bushes 

 occurs a little above the middle of the clay, the roots extending for 

 a considerable distance downwards, while the evenly bedded clay 

 of more recent deposit completely buries it several feet deeg^ before' 

 the conditions that caused tlie deposit of the coarse sand supervened.' 



The occurrence of this upper forest bed would seem to indicate 

 that there had been an interruption of the subsidence, or even 

 re-elevation of the land, during the deposition of these clays, to 

 admit of the growth of the trees and shrubs that form this bed. 



That there is good ground for assuming that the gravel exposed' 

 at the bottom of the section represents the 100 feet terrace is 

 supported by the records of a deep well-boring made a little to the 

 westward of the Post Office. After passing through similar beds 

 of sand and clay and some 10 or 12 feet of gravel, it, before entering 

 the rock, encounters some 8 or 10 feet of tenaceous blue clay,' 

 undoubtedly the Till resting on the surface of the Andesite rock of J 

 the district. . ' 



With the well-boring and the Post Office excavation, we have 

 a complete series of the Glacial and post-Glacial beds superimposed 

 one on the other : Till, 100 feet terrace, forest bed, and Carse Clays. 

 It seems to me that here we are " absolutely sure of the position 

 which this sheet of vegetable matter does occupy." 



le IB "V I E "VsT S. 



I, — The Zones of the White Chalk of the English Coast. 

 By A. W. EowE, M.D., F.G.S. Parts I (Kent and Sussex), 

 II (Dorset), and III (Devon) ; with plates and sections. 

 Published in the Proceedings of the Geologists Association, 

 vol. xvi (1900), vol. xvii (1901), and vol. xviii (1903). 

 (PLATES XV AND XVI.) 1 



WITH the publication of his third paper (on the Chalk of the 

 Devon coast) Dr. Eowe has completed his description of the 

 four chief accessible sections through the Middle and Upper Chalk 

 which are to be found in the cliffs of our southern coast. His papers 

 are doubtless in the hands of most of those who are interested in the 

 Chalk and its fossils, but there may be a few readers of this Magazine 

 both at home and abroad who have not seen them, and in any case 

 it seems fitting that such a series of papers should receive some 

 notice, if only because they deal so fully with the zonal distribution 

 of fossils in the Chalk of Southern England that they merit attention 

 both from the palasontologist and the geologist. 



In the introduction to his first paper. Dr. Eowe is careful to 

 define the point of view from which he attacks the subject. He says : 



^ [Permission to reproduce tlie two plates which accompany this article (Plates XV 

 and XVI) has been granted by Dr. A. W. Eowe, F.G.S. , the author of the paper, 

 Professor H. E. Armstrong, F.E.S., who is the author of the photographs, and by 

 the Council of the Geologists' Association, who published Dr. Eowe's memoir. — 

 Edit. Geol. Mag.] 



