Proceedings. cli. 



Scilly Isles, Cornwall, where it was gathered by Mr. Cunnach as the 

 common C. arenaria, L. 



Chara Braunii, Gmel. (Braun's Stonewort), a generally distributed 

 European species, was gathered in the canal at Reddish, Lancashire, 

 by Mr. C. Bailey, of Manchester, and sent to me for determination. 



Report of the Geological Sub-Committee. 



The attention of the Geological Sub-Committee during this year 

 has been directed mainly to collecting the geological data of the 

 beds at Park Hill, from the footpath bridge, near Coombe Road, to 

 the Upper Addiscombe Road. The beds there exposed are, in 

 ascending order, the Thanet Beds, the Woolwich and Reading Beds, and 

 the Oldhaven Beds, collectively called the Lower London Tertiaries. 



Of these, the Woolwich and Reading Beds had the greatest 

 geological interest, on account of the great length of the beds there 

 cut through, which offered an opportunity for thoroughly studying 

 their sub-divisions and for collecting the fossil remains of their 

 fauna and flora. The reputation of instability, with which these 

 beds have been credited, has been fully maintained in the long 

 cuttings ; their behaviour has caused a greater exposure of the beds 

 than would otherwise have taken place, but has greatly impeded the 

 progress of the contractor's work. The cuttings, however, are 

 approaching completion, and our notes, which extend over a period 

 of two years, may be arranged and prepared for publication. 



In May, when the sections were fresh, when the neatly trimmed 

 banks of the south cutting displayed the variously coloured strata 

 with such admirable definition that the divisions in the section were 

 seen distinctly from the banks above, the Honorary Secretary ex- 

 hibited and explained to the Club his large working diagram, " in 

 which the contour line of Park Hill and the position and thickness 

 of the beds were rendered with scrupulous accuracy." We have 

 the pleasure of reproducmg this section on a horizontal scale of 

 528 feet to the inch and vertical scale of So feet to the inch. 



As the details of the Lower London Tertiaries at Park Hill have 

 been gathered in, the Geological Sub-Committee intends to enter 

 upon fresh work full of scientific interest and practical usefulness, 

 namely, that of preparing, on a scale of six inches to the mile, a 

 geological map of Croj'don and its neighbourhood. In connection 

 therewith we have collected some vertical sections of the neighbour- 

 hood, of which we publish the following, showing in descending 

 order the sequence and thickness of the beds passed through : — 



Croydon Water Works' Well, sunk in 1S76, in Surrey Street : — 

 Surface of the ground 150-ft. above Ordnance Datum ; gravel, 

 valley drift, lo-ft. ; chalk with flints, 204i-ft. 



Croydon Gas Works' Well, 1868, at Waddon. Communicated by 

 Mr. Baldwin Latham, C.E.: — Surface of the ground 126-ft. above 

 Ordnance Datum; black clay, i5-ft. ; yellow clay, 6-ft. ; black sand, 

 20-ft. ; mottled clay, 33-ft. ; oyster bed, lo-it. ; mauve coloured sand 

 and pebbles, 13-ft. ; green coloured sand, 6-ft. ; green flints, 9-in. ; 

 chalk, 138-ft. 



Croydon Workhouse Well, Queen's Road. Communicated by Mr. 

 John Berney: — Surface of the ground iC2-ft. above Ordnance 



A II 



