RECENTLY-KX POSED SECTIONS IN" GLACIAL DEPOSITS AT HENDOy. 579 



juid tlic Ibulder-chiy there is usually from (') to 12 inches of a 

 sandy l.iiniiialod clay, almost entirely devoid of stones*. 



In one part of the pit the laminated elay and an underlying band 

 of gravel were seen to have been bent down into one of the 

 channels in a raMier remarkable manner (fig. 2); and as there is no 

 indication of a sinking of the surface, or of any increased thickness 

 of soil over the Boulder-clay, it seems evident 'that this effect must 

 have been ]>roduced contemporaneously and mainly by pressure, 

 when the overlying Boulder-clay was deposited, especially as the 

 other beds which uuderjie the laminated clay are also in a disturbed 

 and contorted condition. 



Section 3, which has been exposed during the last two years in 

 a field at Hendon Grove near the western edge of the plateau, 



Fig. 3. — fScdinu ill Upper Gravd-pit, at Hendon Grove. 

 [About 35 feet in length.] 



a. Surface soil. 



a'. Gravelly soil (with flints). Irregular. 



b. Yellowish-brown clay, in places passing downwards tb rough 



the unflerlyiug sands and gravels (2-7 feet). 



d. Loamy sand with ochreous bands (1 foot). 



e. Gravel (1 foot). 



./". Yellomsh sand, sometimes showing current-bedding (2 feet). 

 <7. Ochreous gravel, with large pieces of sarsen-stone, rounded and 



subangular flints, chert, quartzite, quartz, ironstcme, &c. (2-4 



feet). 

 h. London Clay, much disturbed, of a brown colour, and forming a 



very uneven floor under the Glacial deposits. 



offers evidence very similar to that referred to as occurring in the 

 West View pit, the chief difference being a diminished thickness of 

 Ui)per Boulder-clay. "Within a very short distance, however, from 

 this point, in the excavation made in laying down the sewer in the 

 road leading to St. Mary's Church, about 285 feet above 0. D., from 

 six to eight feet of clay were passed through before the sand 

 was reached. The London Clay was touched at from 14 to 16 feet 

 from the surface. It must be understood that, in the scores of 

 sections exposed in pits and deep drains at various points, consider- 

 able variability has been frecpiently observed in all the deposits. 



* A similar laminated clay has been mentioned by Mr. H. B. Woodward as 

 occurring frequently under the Chalky Boulder-clay, and I have also recently 

 .seen it occupying the same position in a large gravel-pit at AVhetslone and in 

 pits at Fiuchley, &c. 



Q. J. a. S.* No. 188. 2 s 



