Notices of Memoirs — A. C. G. Cameron — Green Sand. 469 



tiou were unlocalised, and the species, as far as can be ascertained, 

 has never been referred to since either by Davidson himself or 

 by any other writer up to the present time. There is very little 

 doubt that the new material from the Irwin Eiver District yielded 

 also the Davidson types. The paper concluded with a small list of 

 Carboniferous fossils collected in the same neighbourhood, which 

 have been described and figured by Messrs. A. H. Foord and G. 

 J. Hinde in the Geological Magazine for 1890. 



VI. — The Fuller's Earth Mining Co. at Woburn Sands. By 

 A. C. G. Cameron, Geological Survey of England and Wales. 



SINCE reporting to the British Association in 1884: and 1891 on 

 the progress made in working this mineral, the demand for it 

 has gone on steadily increasing, and mining on systematic principles 

 has been established in Bedfordshire for the first time. The mines 

 now show an extensive industry, with underground galleries that 

 extend many hundreds of feet. The layers of earth as they come to 

 be worked are not found disposed quite evenly, but raised into slight 

 inequalities, ridge-and-furrow-like. Although all one sort of earth, 

 the layers alternate in colour downwards, from yellow, through blue, 

 to yellow again ; a difference in colour which Mr. Player, who 

 has analysed the Woburn earth, does not consider is explained by 

 difference in composition. 



It has long since been suggested that the name " Woburn Sands " 

 should be applied to the lower portion of the Lower Greensand of 

 the Midlands, and the name may well be retained for Bedfordshire 

 and Bucks. It is at Woburn Sands, in these counties, that the 

 greatest expanse and gi'eatest thickness of Greensand occurs, and, 

 where it contains also those valuable deposits of fuller's earth. 



ViL — Note on a Green Sand in the Lower Greensand, and on a 

 Green Sandstone in Bedfordshire. By A, C. G. Cameron, 

 Geological Survey of England and Wales. 



THE beds in the section at the " Parish Sandpit " at Apsle}'^ Guise 

 are given below in descending order : — 



1. Yello-vsr and grey sand with strings of yellow fuller's earth 



2. Lenticular seam yellow fuller's earth 



3. Yellow and grey sand, in parts false-bedded 



4. Yellow fuller's earth, dovetailed amongst green sand 



5. Yellow ochre 



6. Bright green sand ' hearted ' darker green 



7. Coarse, buff-coloured irony sand 



Oxford Clay 54 10 



The bright green sand (No. 6), with a darker middle portion, 

 consists of irregular- shaped grains of quartz, stained green ; besides 

 which, there are brown grains, the precise nature of which remains 

 for the present undetermined. With the hammer this sand gives a 

 brown streak, the brown grains, which are comparatively soft, being 

 the cause of it. The absence of glauconite is a distinct feature in 



