Manchester Memoirs^ Vol. xliii. (1899), No. 1, 13 



critical examination of the published results of geological 

 workers reveals a remarkable paucity of fossils, and the 

 existence of much doubt as to the true position and 

 nature of what few have been found. 



It is evident also that the claims of the Manx slates 

 to be considered as equivalents of some parts of the 

 Skiddaw slates of the Lake district rests largely upon 

 the correct identification of not more than half a dozen 

 species. [The absence of the numerous Arenig species 

 which form a well-marked fauna in one part of the Skiddaw 

 rocks of the Lake district, if it be not explained by the 

 obliteration of the fossils by earth movement, seems to 

 indicate that the upper beds of the Skiddaw series may not 

 be represented by any part of the Manx slates. — G. W. L.] 



Evidence gained from lithological structure and 

 stratigraphical sequence is not yet available, for the true 

 structure of the area does not yet seem to have been 

 unravelled. 



Conclusions. 



The association of such forms as those enumerated in 

 this paper seem to indicate that the stratigraphical position 

 of the slates will be found ultimately to be either amongst 

 the uppermost beds of the Cambrian system, or in the 

 Arenig Series. 



It is a pleasing duty to acknowledge the great debt I 

 owe to Mr. G. W. Lamplugh of the Geological Survey 

 as well in the field as by the loan of specimens, and by 

 constant advice and assistance. 



