MEMOIRS 



OF THE 



LITERARY AND PHILOSOPHICAL SOCIETY 

 OF MANCHESTER. 



I. Notes on some Superficial Deposits at Great Orme's 

 Head, and as to the Pe7'iod of its Elevation. By R. D. 

 Darbishire, B.A.^ F.G.S. 



Read October 15th, 1867. 



Amongst the most interesting inquiries of the geology of 

 to-day are those that aim at tracing the changes of the 

 earth^s surface which have last preceded the general con- 

 ditions under which our present life on it obtains. These 

 changes, if any, are due to causes still in operation, and 

 therefore are such as in an especial degree allow the exactest 

 analogies, to be tested by the, so to speak, experimental 

 results of daily and local observation. 



The situation of superficial formations and most of their 

 phenomena place them within the reach of rapid survey. 

 Sections are numerous and accessible, or easily made so. 

 The matrix is usually readily worked, and such remains of 

 organic or mineral character as occur are generally not 

 very difficult of identification. 



If to these inherent facilities be added the increasing in- 

 terest in such questions, the growing habit of frequent 

 travel, and the excessive opportunity of publication of the 



SER. III. VOL. IV. B 



