Proceedings. Ixxv. 



western valley in this part of the river basin of the Ravens- 

 bourne. From the lake the party proceeded through the planta- 

 tion to the Addington Hills, where the fine section of the 

 lower beds of the Oldhaven series, at the back of the Sand Rock 

 Hotel, was inspected, and was described by Mr. Lobley. 



The Addington Hills themselves were next visited, and a 

 pit excavated in the upper beds of the Oldhaven series was 

 examined. These hills form the northern escarpment of 

 the Oldhaven beds, which here attain a height of nearly 

 500 feet above the sea level. From their top the chief 

 physical features of the country and the distant objects of 

 interest, were pointed out by the Directors. Attention was 

 particularly called to the small valley immediately at the 

 foot of the hills, cut down into the chalk, and to the 

 still larger valley between that and the South Norwood 

 Hill, which is formed in the London clay; the two valleys 

 being, together, about four miles across ; and the way 

 in which these valleys were probably formed was fully 

 discussed. The water-shed ridge, which divides the basins of 

 the modern rivers Wandle and Ravensbourne, crosses these 

 valleys nearly at right angles, and runs from the Addington 

 Hills in a direction about N.N.W., the lowest point of the 

 ridge being about 150 feet above sea level. The exact 

 course of this ridge was pointed out and described by 

 Mr. Flower. Attention was also called to the deep valleys 

 which run up into the hills, caused, probably, in times long 

 past, by the action of springs similar to those already visited, 

 and to South Norwood Hill, which is all London clay, the 

 summit being nearly 400 feet above sea level. 



By the kind permission of the Archbishop of Canterbury, 

 Addington Park was next visited. A small lake, fed by springs 

 from the pebble beds, and situated in a deep valley cut out of 

 the pebble beds, was examined and described b}' the Directors; 

 and the party then moved on to the Pinetum, where were seen 

 some very fine specimens of Abies Douglassii, of Abies 

 Menziesii, Pinus Nobilis, and other Conifers. The " Fir Mount," 

 overlooking Addington village and the site of a hunting seat, 

 much used by King Henry VHL, was the last point of special 

 interest in the Park which was visited. From the Mount, which 

 is situated on the top of the southern escarpment of the 

 Oldhaven beds, fine views were obtained, and the high 

 ground of Worms Heath, four miles distant, capped with 

 pebble beds, which must once have been continuous 

 with those in Addington Park, was pointed out and 

 described by the Directors. The party next proceeded down 

 the steep face of the escarpment to Addington village, situated 



