506 



MESSES. WHITAKEE AND JUKES-BEOWNE ON [Aug. 1894, 



by Mr. Hill, who describes it as consisting of very fine 

 argillaceous matter having a brownish tint in thin slice. In 

 it are some large glauconite-grains curiously arranged in rows, 

 and a few small quartz-grains. 



796. A sample of dark, dull-green sand, held together by earthy 

 matter. When washed it is seen to consist partly of glauconite- 

 grains and partly of small bits of qnartzose and siliceous rocks ; 

 the glauconite-grains are quite as numerous as the others, but 

 even-sized and smaller than many of the quartz-grains. Some 

 of the quartz is clear, but most of the grains are dirty from 

 enclosures. There are many rolled grains of lydianite and fine 

 siliceous grit, some of slate and some of a brown rock. A few 

 shell-fragments occur, and under an inch-objective two or 

 three foraminifera were seen, but they are scarce. 



800. Grey shelly limestone of Wenlock type, full of brachioporls 

 (many specimens of Leptcena transverscdis) in a calcified shelly 

 matrix. Another sample is a dull earthy limestone with 

 Leptcena, Orthis, and other fossils. 



802. Dark-grey earthy mudstone, with a shelly layer containing 

 Leptcena transverscdis, Pentamerus linguifer?, Orthis elegantula, 

 and other fragments of shells. Another piece of hard grey 

 mudstone with scattered shells. 



804, 809. Hard, earthy mudstones, slightly calcareous, with shelly 

 layers, composed chiefly of Leptcena and Or^tis-shells. 



827. Two samples of dark-grey calcareous sandstone, with many 

 fossils (Pentamerus gcdeatus, Orthis elegantula). 



Classification of the Beds. 



From the preceding data, and from information given by Mr. 

 Francis, we are able to construct the following tabular view of the 

 succession at Ware : — 



Alluvium and Kiver Drift 



Upper Chalk 



Middle Chalk 



Lower Chalk 



Upper Greenland 



Gault 



Wenlock Beds 



Thickness. 



Feet. 



17 



?183 



227 



1(53 



40 



l«6f 



35 



Depth. 

 Feet. 



17 

 200 

 427 

 590 

 630 

 796i 

 83H 



In comparing this with the section previously published it will 

 be seen that we have been able to divide the Chalk in accordance 

 with modern views, and that we have considerably curtailed the 

 thickness of the Upper Greensand, which had been previously given 

 as 77 feet, although one of us had suggested that this was too great 

 a thickness. The older account places the base of the Chalk Marl 

 at 558 feet, but the specimens prove that it lies much lower than 

 this ; the sample from 585 feet is undoubtedly a chalk, though very 

 micaceous and glauconitic ; that from 591 is undoubtedly a green- 

 sand ; the junction must therefore lie between these depths, and we 



