TRANSACTIONS OF SECTION C. 711 



tity of green sandstone of a bright colour, and sometimes of a glassy texture, which 

 has been recognised as like some that occurs in the Lower Greensand ot Ightham, 

 Kent. It is a serviceable-looking stone, and the brightness of its colour adds 

 beauty to the brown sandstone, of which the edifice is mainly built. The stone 

 seems to be a counterpart of the green sand in the Aspley Section, and similarly 

 colour-hearted. Professor Bouney, on receiving specimens of the Husborn'e 

 Crawley rock, but speaking from sight only, doubts, however, whether it is the 

 same as the green sand at Aspley. It may be mentioned that pieces of the same 

 rock have been dug up in the roadway half a mile from the church, and a larger 

 boulder-like piece lies by the roadside, on the outskirts of the village green. Ad- 

 joining the churchyard is a very old-looking excavation that suggests the spot at 

 which this stone may have been got. Seeing the difficulty of transporting stones 

 in olden times, it is extremely unlikely that the stone came from a distance. 

 Possibly, therefore, there may be some local equivalent of the Lower Greensand of 

 Kent in the Bedfordshire Greensand, which, if not entirely dug away in supplying 

 the stone for Crawley Church, may yet again be brought to light. 



9. The Fullers' Earth Mining Company at Wohurn Sands. 

 By A. C. G. Cauekon, Geological Survey of England and JVales. 



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 even, 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 ex- 

 plained by difference in composition. 



It has long since been suggested that the name 'Woburn Sands' should beapplied 

 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 greatest thickness of Midland Counties 

 Oreensand occui's, and where it contains also those valuable deposits of fullers' earth. 



10. Beport of the Committee on the Circulation of Underground Waters. 



See Reports, p. 264. 



FRIDAY, AUGUSTS. 



The following Papers were read : — 



1. On a Widespread Eadiolarian Chert of Arenig Age from the Southern 

 Uplands of Scotland. By B. N. Peach, A.'R.S.M., F.B.S., F.G.S., 

 of the Geological Survey of Scotland. 



[Communicated by permission of the Director-General.] 



The Silurian rocks of the South of Scotland are chiefly made up of greywackes 

 and shales. The Moffat shale group, which lies at their base, consists of -liner 

 sediments. Beneath these latter there is a widespread deposit of chert, which is 

 chiefly made up of the remains of radiolarians. This chert zone, where typically 

 developed, is about 100 feet thick, and is divisible into — 



•An upper sub-zone of dark Lydian-stones and massive grey chert. 



