XXX PROCEEDINGS, 



boulder-clay, one in a thick bed of gravel and the other at the 

 surface of the ground, showing that, whatever may have been 

 the manner in which the boulder-clay and gravel were deposited, 

 they are very closely connected with one another. This large 

 excavation is now being filled in with rubbish. 



The party then walked to Hatfield, and on the way, just south 

 of the River Lea, a disused brickfield was pointed out, from 

 which Prestwich drew his section* across the valley of the Lea 

 to Ayot Green, but there was not time to visit it. 



Tea was provided at the " Salisbury Anns," Hatfield, after 

 which, on the proposition of the President of the Geologists' 

 Association, Mr. R. S. Herries, a vote of thanks was accorded 

 to the Directors. Hatfield Park was then visited by most of the 

 party, by the kind permission of the Marquis of Salisbury. The 

 Park was entered by the old gate near the Church and left by 

 the new gate opposite the railway station. 



Although the weather was fine in the afternoon, but gloomy, 

 rain had been falling all the morning, and the roads were too 

 muddy for cycling, so the party was not a numerous one. 



Field Meeting, 9th June, 1906. 

 CROXLEY, RICKMANSAVORTH. 



The discovery of Palaeolithic implements and of the remains 

 of vertebrate animals in the pits of tlie Rickmausworth Gravel 

 Company having recently been brovight before the Society Iw 

 Sir John Evans, f this meeting was arranged with the permission 

 of the Company to enable our geological members to examine 

 the pits under the direction of Mr. Vernon P. Kitchiu, who has 

 succeeded in finding a large number of implements in the gravel. 



The pits are in Long Valley Wood, on the right-hand bank 

 of the River Gade, from which they are distant about an eiglith 

 of a mile, and they show extensive sections of the fluviatile 

 gravel. + This has been worked for a distance of about lialf 

 a mile in a north-easterly direction. Interstratified with it are 

 layers of sand and clay, and the total thickness of the alluvial 

 deposits is from 20 to 30 feet. They rest on the Chalk in a very 

 uneven manner, so that it is difficult to determine the height 

 of their base, but it appears to average about 30 or 40 feet 

 above the level of the existing river. This is a tributary of the 

 Colne, which here flows from east to west, and is distant half 

 a mile at the eastern and a quarter of a mile at the western 

 extremity of the gravel in Long Valley Wood, and this gravel 

 should rather be considered as part of the alluvial deposit of 

 the Colne in Pleistocene times than of that of the Gade. 



* 'Quart. Journ. Geol. Soc.,' vol. xlvi, p. 138. 



t ' Trunsactious,' Vol. XIII, p. 65. 



X This gravel is mapped as glacial by the Geological Survey. • 



