1865.] FOSTER AND" TOPLEX MEDAVAY GRAVELS. 459 



In the gravel already described as occurring half a mile north 

 of Maidstone Gaol, some of the deposit has plainly been disturbed 

 since its deposition (fig. 7). The gravel is resting on Folkestone 

 Beds : both dip at an angle of about 40°. The pebbles have their 

 longer axes in the same direction, while the finest gravel and sand 

 dip just as much as the coarser kinds. Here it seems plain that 

 the gravel was deposited on horizontal Folkestone Beds, and that the 

 whole has subsequently been disturbed. 



It does not seem probable that ice should have produced this 

 result ; it is more likely that some of the underlying Rag has been 

 dissolved away, causing a subsidence of the overlying beds. Fig. 8, 

 from another part of the same pit, shows some small faults produced 

 by the disturbance. 



Fig. 8. — Section in another part of the same pit as Fig. 7. 







Disturbed Gravel at Preston Quarry, Aylesforcl. — Mr. Bensted, 

 of Maidstone, has published * an account of the strata at Preston 

 Quarry. He describes and figures a sharp anticlinal affecting both 

 the Greensand beds and the overlying gravel. Sir R. I. Murchison, 

 in his paper " On the Flint Drift of the South-east of England " f, 

 also alludes to this section. Mr. Bensted considers certain perfo- 

 rations by marine shells in the topmost bed of Rag to be of recent 

 origin. A careful examination, however, will prove, we think, that 

 the bed in which Mr. Bensted has found perforations is overlain by 

 Sandgate Beds and Folkestone Beds ; therefore the perforations must 

 belong to the Greensand period. It certainly seems, however, that 

 the gravel has been disturbed since its deposition. May not this be 

 due to a dissolving away of the Rag, producing a subsidence in two 

 places, which has caused the strata to dip down on both sides of 

 the quarry in the manner described by Mr. Bensted ? 



* ' Geologist,' 1862, p. 450. 



t Quart. Joiirn. Geol. Soc. vol. yii. (1851), p. 383 (foot-note). 



