394t Mr, BoGG on the Wolds of Lincolnshire, 



greater flux at the time of high water, and particularly at spring 

 tides ; showing that the water in the chalk communicates with the 

 sea, a circumstance which would lead to a supposition that the sea 

 rests immediately on the chalk at a certain depth : if so, we might 

 possibly expect that the agitation of the water would frequently 

 throw up chalk on the coast, which I have never yet observed. 



The chalk consists of two colours, red and white, each lying in 

 regular strata, the red being generally undermost : in the white, 

 seams of flint are frequently met with from two to six inches thick. 



The stratum, No. 3, immediately below the chalk, is a coarse 

 brov/n pebbly sand without organic remains, consisting of quartz 

 and oxyd of iron. This bed is, I apprehend, of irregular thick- 

 ness ; I suppose it may vary from six to ten yards, but its appear- 

 ance at its basseting is very uncertain ; for, being of a very loose 

 texture and the chalk which reposes upon it being of a more 

 compact nature, it is evident that when these parts were exposed 

 to the action of water, the sand being less capable of resisting 

 the washing of that element than the chalk, this latter would be 

 left in many instances forming projecting cliffs ; which time, and 

 the well known action of the atmosphere, would crumble down 

 over the sand, and form those declivities which now in such variety 

 are exhibited to our view* 



The next bed. No. 4, contains In nearly equal proportions oolite 

 limestone and calcareous clay of a lightish grey color. In certain 

 parts of this bed the clay divides the seams of stone into regular 

 strata ; in others the stone is found to occur in the clay in large 

 detached pieces. This hed never extends to any great distance 

 beyond the chalk, forming in general a sort of step at the foot of 

 its basset. Lumps of pyrites are frequently met with in the lime- 

 stone. The thickness of the entire bed of stone and clay may be 



