﻿360 A. J. Jukes Browne — On the TJ'p])er Greensand, etc. 



I will now give Dr. Barrois' interpretations of the sections in 

 tlie three areas we have been chiefly concerned with, viz. the 

 Weald, the Isle of Wight, and the Western area. In the Isle of 

 Wight, at St. Lawrence, he gives the following : — 



Zone I. Amm. inflatus. Feet 



A. Micaceous and Glauconitic sands, with bluish argillaceous 



bands at the bottom 105 



B. Yellowish sandstone, with hard siliceous bands ... 12 



Zone II. Pecten asper. 



( C. Greensand with phosphate nodules 6 



( D. Eands of green sandstone and bluish chert 24 



E. Chloritic Marl 7 



A certain similarity will be noticed between this section and those 

 previously given, all of them being capable of a natural division 

 into two unequal portions, to the upper of which all unite in giving 

 a thickness of 30 to 36 feet. Moreover, the lists given by Dr. 

 Barrois from these two divisions, in the Isle of Wight and the 

 neighbouring county of Dorset, show that they contain two different 

 groups of fossils, the one of which corresponds with that found in 

 the tipper Gault and Blackdown beds, while the other resembles 

 the Warminster fauna. In Surrey (p. 141), he looks upon the 

 lower soft sandstones and marls as belonging to the zone of 

 Am. inflatus, and upon the Firestone as representing the zone of 

 P. asper. In Hampshire he gives an account of the beds near 

 Petersfield (p. 36), and thus describes them — 



Feet 



1. Soft, micaceous sandy beds, with Am. inflatus 75 



2. Coarse quartzose sands and sandstones 15 



3. Marly bed with glauconite and nodules of phosphate of 



lirae (no fossils seen) 3 



The second he refers to the Warminster beds or Pecten asper zone, 

 and the last he assimilates to the Chloritic Marl : remarking " that 

 these two horizons have not befoi'e been identified in this part of 

 Hampshire." He also mentions a road section near Binstead, where 

 a similar nodule bed is seen resting on coarse greensand s, which he 

 considers to represent the Pecten asper zone ; he does not give any 

 very definite opinion regarding the position of the Malm-rock, but 

 he does not seem to distinguish it from Firestone. 



The superposition of the Warminster beds to those of the Black- 

 down or Amm. inflatus zone is stated to be visible in the vales of 

 Warminster and Pewsey, even if it had not been so clearly indicated 

 by Mr. Meyer in Devonshire. 



He adopts Mr. Meyer's account of the series of beds exhibited 

 near Beer Head as giving an accurate description of the different 

 horizons, but differs from him in the correlation of the several 

 groups ; admitting the existence of a Blackdown fauna (belonging 

 to Etage A) in the beds numbered 2 and 3, he does not think that 

 Nos. 4, 5 and 6 are sufficiently different to be separated from the 

 lower beds, and as they contain large Pecten 4:-costatus and Ex. 

 conica, he refers them to Etage B of the same division or zone (see 

 ante). No. 7 he considers to be a pebble bed separating the two 

 divisions, and he gives to the lower or Am. inflatus zone a thickness 



