14 AN^ EXPLANATION OF THE CLAXHEUGH SECTION. [Feb. 1 898, 



3. An Explanation of the CLAXHErGH Section (Co. Dueham). By 

 D. WooLAcoTT, Esq., M.Sc. (Communicated by Prof. G. A. 

 Lebotje, M.A., E.G.S. Eead June 23rd, 1897.) 



[Abstract.] 



The section of whicli an explanation is offered in this communi- 

 cation occurs about 2 miles west of Sunderland, and has been 

 noticed by Messrs. King & Howse, and Prof. Lebour. The base 

 shows the Permian Yellow Sands, which are succeeded at the 

 western end of the section by the Marl Slate, thin-bedded lime- 

 stones, and at the top crystalline limestones without any trace of 

 bedding. At the eastern end the Marl Slate and thin-bedded lime- 

 stones are absent, and except when a breccia intervenes the crystal- 

 line limestones rest on the Yellow Sands, though the thin-bedded 

 limestones and Marl Slate show no signs of thinning out. There 

 are also minor complications. The Author suggests that the section 

 may be explained by supposing that denudation occurred in a 

 cavern, the roof of which afterwards feU in, and that disturbances 

 were also produced by ' creep '-movements. 



