HOWAHTII : NOTES ON HOULDKH MARKINGS. 
49 
line travelled to Yorkshire and the Cleveland area by the Stain- 
moor and Tees route. There are, however, a few exceptions 
to this general rule. Eskdale granite, for example, has been 
recorded north of this line, whereas its general distribution 
is southward of its outcrop. Similarly Shap granite, the out- 
crop of which is north of this suggested line, is distributed far 
to the south-west ; but these dispersals were probably in the 
■earlier stages when the local glaciers had free outlets. 
The rocks from Cumberland, marked " C " on the map, 
include Armboth Dyke, Carrock Fell gabbro, and Borrowdale 
a,ndesite. Those from Westmoreland, marked " W," are princi- 
pally Shap granite, but include the distinctive Brockram from 
the same county. 
It should be remembered that these rocks are everywhere 
accompanied by others picked up all along the route, and of 
•course greatly exceeding them in numbers. 
For instance, the " Western " group is accompanied by 
great numbers of boulders of Carboniferous limestones, sand- 
stones and cherts. Whin Sill, etc., and the same rule applies 
to the " Northern " group, to be mentioned presently, which are 
•accompanied b}^ greywacke sandstones and conglomerates, and 
magnesian limestone of the Roker type, etc. 
These, however, are not marked, in order not to load the 
map, and so perhaps confuse the three distant directions of 
source. 
The Northern Group. 
Rocks from Durham County, the Cheviot area of Northumber- 
land, and Scotland are present in the Yorkshire drift, including 
the Cleveland area. 
These include andesites and porphyrites from the Cheviots, 
probably both from tlie English and Scotch side, but the 
iormer predominating ; the characteristic " Haggis " rock from 
the northern edge of the southern uplands of Scotland ; and 
red jasper, sanidine trachyte, dolerites, and basalts from the 
southern uplands of Scotland. These are all marked " S " on 
the map. 
D 
