Manchester Memoirs, Vol. xliii. (1899), No. 1. 3 



interpretation of them as being dependent upon a fuller 

 knowledge of the Lake district rocks. Mr. Lamplugh's 

 researches, already alluded to, seem to indicate that a 

 close comparison between the two areas by the aid of 

 stratigraphy is well nigh impossible. 



Reviewing all the work upon the Isle of Man slates, 

 it would appear that a general unanimity exists that they 

 represent the same phase of sedimentation as the Skiddaw 

 slates of the Lake district, but whether they are wholly 

 or in part contemporaneous, or whether they are capable 

 of the same divisions is a matter upon which no con- 

 vincing evidence has been produced. [It has also been 

 shown* by Mr. J. E. Marr that, under the term " Skiddaw 

 slates," there has been included, on the mainland, a series 

 of rocks having a wide stratigraphical range, so that even 

 if the general correlation be accepted, the exact age of 

 the Manx slates is not thereby settled. In the map of 

 the island recently published by the Geological Survey, 

 the term "Skiddaw slates" is dropped, and the name 

 " Manx slate series " substituted, the age being given as 

 doubtfully Cambrian. — G. W. L.] 



The fossils found have been very few and of a 

 somewhat problematic character, and the most which could 

 hitherto be said of them was. that they are traces of a 

 fauna which had much in common with that of some 

 portion of the Skiddaw slates. 



This paper is an attempt to review in detail the 

 palseontological evidence of previous observers, and to 

 present additional facts upon the fauna of the Manx 

 slates. 



The Rev. J. G. Gumming and others had in various 

 papers alluded to the occurrence of fucoidsor "corallines" 

 of an indeterminable character, but it was not until 1862 

 * Geol. Mag., 1894, Dec. 4, vol. i., p. 122. 



