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



I. The Palaeontology of the Manx Slates of the 

 Isle of Man. • 



By Herbert Bolton, F.R.S.E. 



Read April ^th. Received April igth, i8g8. 

 (With additions by G. W. Lamphigk, F.G.S., Jan. ^th, iSgg. ) 



The series of slates and grits which make up the 

 greater part of the Isle of Man have long been considered 

 as the equivalents of the Skiddaw slates series of the 

 English Lake district. 



Their claims to be so considered have hardly been 

 satisfactorily proved. 



Prof Henslow,* who described the geology of the 

 island in 1821, classified the series now called Skiddaw 

 slates according to lithological character, dividing them 

 into a quartzose series, clay-slates, mica-slates and grey- 

 wackes. 



Cummingf regarded them as lower silurian, whilst 

 Messrs. Grindley;}: and Taylor§ wrote of the "cambrian " 

 strata of the Isle of Man. 



In no case did the authors furnish any evidence, 

 beyond that of general resemblance, by which the series 

 could be correlated with the Skiddaw series of the Lake 

 district, and the Cambrian series of North Wales. 



* "A Supplementary Notice of the Isle of Man." Trans. Geol. Soc, 

 Ser. I., Vol. v., 1821. 



+ The Isle of Man, Its History, &•€. London : Van Voorst, 1848. 



J "Geology of the Isle of Man." Geologist, 1862, pp. 171 — 183. 



§ " Supposed Imprints in the Lower Cambrian Beds of the Isle of 

 Man." Geologist, Vol. v., 1862, p. 321. 



May 4th, i8gg. 



