EXPLANATION OF THE CLAXHEUGH SECTION. 217 



a visit to the actual exposure, but it is hoped that the sections 

 and accompanying photographs portray as far as possible the 

 real nature of the section. Instead of the two divisions ending 

 gradually as in a case of the dying out of strata, or abruptly 

 as might have been possible if the beds had been disturbed 

 before the upper beds were deposited upon them, they are 

 followed eastwards by about forty feet of broken masses of 

 Compact Limestone, then by a mass of breccia of about similar 

 length (6 and 7, Section I). The details of this portion of the 

 exposure are shown in Section II. and photographs (2 and 3). 

 The latter section shows that the layers of the Compact Lime- 

 stone and Marl Slate are sharply cut off by a crack S Si, and 

 that there has been a settling down of the Shell Limestone. 

 Lying in between the Yellow Sands and this limestone are 

 some large masses of Compact Limestone (H and L), while at 

 one part a small portion (M) of the Marl Slate rests apparently 

 in situ. Two very much bent layers A and B of Compact 

 Limestone are specially worthy of notice, squeezed in as they 

 are between the Yellow Sands and overlying limestone, while 

 at F and G is a finely powdered mass of limestone now very 

 hard and compact. At D the Yellow Sands are very much 

 banded, and bear evidence of having been at one time sub- 

 jected to great pressure, and very curiously a portion of these 

 sands appears to have been forced from D along K F right 

 up over the breccia E. This breccia consists of broken 

 fragments of limestone, both Compact and Shell, cemented 

 together. 



A noteworthy feature is the large number of cracks which 

 occur in the section. C 2 in the second section has several 

 smaller ones running from it, all of which are associated with 

 very slight dislocations in the Hmestone. C 2 in both sections 

 are the same, and it will be seen on referring to the first 

 section that there are three large cracks running from top to 

 bottom of the whole mass of the Shell Limestone. Two of 

 these C 2 and C 3 cut through the Compact Limestone and 

 Marl Slate, but die out in the Yellow Sands beneath. The 

 latter of these is virtually a small fault throwing a few feet to 

 the east, 



