﻿472 



MESSRS. WHITE AND TREACHER ON THE [Aug. I905. 



yellowish hue, its more brecciate aspect, and by a paucity of 

 adherent organisms. 



The jointing in this division is, on the whole, frequent and 

 rectangular; but in the lower half there is, in addition, a sub- 

 horizontal system which divides the chalk into biconvex lenses, from 

 2 to 15 feet in diameter and from a few inches to 4 feet in depth. 

 At the surface of these lenses there is frequently a hardened pellicle 

 exhibiting a shallow grooving and a high polish, probably attributable 

 to slickensiding. Irregular seams of brown phosphatic sand, with 

 quartz-grains and earthy matter, occur in the joint-fissures of the 

 lower beds, near the middle of the pit. We regard all such sandy 

 layers, whether conformable to the general stratification or other- 

 wise, as post-Cretaceous decomposition-products. 



Fossils are very scarce, ar.rl we can record only the following 

 remains : — 



Pisces. 



Corax falcatus, Ag. 



Inoceramus sp. 



Ostrea vesicularis, Lam. (r. c.) 



Serpula fluctuata (?) S. P. Woodw. 



Echinocorys scutatus, var. (cf.) pyra- 



midatus, Portl. 

 Micraster cor-angubium (?) Klein. 

 Metopaster Parkinsoni, Forbes. 

 Pentagonaster megaloplax, Sladen. 



Echinocorys is represented by rather stout fragments, but part of 

 a test referable to the var. pyramid dtus, and clearly derived from 

 this division, was found on the talus. 



Division (D). 



The Upper Brown Band, which of all the divisions of the Lodge 

 section has received the most attention from former observers, 

 resembles the Lower in its brownish to yellowish-grey colour, in 

 its friability, in its massive jointing, and in the conglomeratic 

 character of its lower parts. There are, however, many minor points 

 of distinction, which become apparent on a closer inspection. Among 

 these may be mentioned the greater abundance of the small brown 

 or yellowish-green concretions (to five-eighths of an inch) and of 

 remains of Ostrea and belemnoids, and the lighter colour of the 

 larger debris (subangular and pebbly pieces of firm white and 

 yellow chalk) of the beds below. 



Boring organisms have been rampant at thishorizon, their Terebella- 

 like productions often weathering-out as cylindrical plugs, which are 

 sometimes seen to terminate upwards at smooth brown laminse — 

 possibly bedding-planes. 



Under the microscope, samples of this chalk are generally distin- 

 guishable from those of the Lower Brown Band (B) by the smaller 

 size and larger variety of the foraminifera, and by the greater pro- 

 minence of the Textularidse and of rod-like objects. 



There is the same lack of definition in the upper limit of this 

 division as was noted in the case of the Lower Brown Chalk, the rich 

 phosphate grading into the white beds above. 



In protected spots the fossils stand out in high relief on the 

 weathered sandy surface, and commonly exhibit a bluish-grey 



