THE 
GEOLOGICAL MAGAZINE. 
NEW. SERIES... DECADE II, .VOL.. VII. 
No. I—JANUARY, 1880. 
ORIGINAL ARTICLES. 
——>—_—_. 
JI.—NotTES ON THE GEOLOGY oF THE IsLE or Man. 
By the Rey. J, Currron Warp, Assoc. R.S.M., F.G.S., ete. 
(PLATE I.) 
HE following notes have been made during a few weeks’ holiday 
in the Isle of Man, and my special object is to notice those points 
which have a bearing upon the geology and physical history of the 
neighbouring Guinherland mountains. For many years I have, from 
time to time, looked across to the hills of Mona’s Isle, regarding 
them as a portion of the Cumbrian group standing aloof from their 
brethren, and often have I wished to carry my hammer amongst 
them. My wish has at last been fulfilled, but the bad weather of 
the coldest of summers has prevented the observations made being 
as full as I had intended. Such as they are I offer them. 
At the outset I would wish to add my testimony to the careful 
and accurate observations of the Rev. J. G. Cumming, as recorded 
in his work on the Isle of Man, made when geological science was 
far less advanced than at present. 
My remarks shall be grouped under the heads of the various 
formations represented, and a final glance taken of the physical 
history of the island as contrasted with that of the Cumberland © 
mountains. 
SKIDDAW SLATES. 
One of my chief objects in examining the geology of the Isle of 
Man was to see whether the group of rocks supposed to answer to 
the Skiddaw Slates of Cumberland threw any light upon the sub- 
divisions of these latter. In previous papers I have pointed out that 
the so-called Skiddaw Slates may be divided into the following 
parts, commencing with the highest member :— 
4. Skiddaw Slate proper (black clay-slate of Skiddaw). 
5. Coarse Grit. 
2. Black Iron-stained Slates. 
1. Thick-bedded Sandy and Gritty Series (of Grasmoor and 
_ Whiteside). 
The Grit No. 3 I have thought to represent the Arenig Grit of N. 
' Wales, which it resembles in character and, so far as can be ascer- 
tained, position. No. 4 would then stand for the Arenig Slates, 
No. 2 for the Tremadoc Slates, and No. 1 represent the “Lingula 
DECADE II.—VOL, VII.—NO. I, 1 
