THE GEOLOGY OF PUFFIN ISLAND. 85 
( Granite, from Crifell.* 
| St. John’s Quartz Felsite. 
Tuffs, from different horizons of the Bor- 
rowdale Series. 
‘“Flinty lava and tuff” (Ward), from upper 
Derived from part of Borrowdale Series. 
Lake district. | Ennerdale Syenite. 
Coniston Grit. 
Micaceous shale. 
St. Bees’ Sandstone (?). 
Vein Quartz, resembling that of Lake 
( district. 
( Arkose. 
| Greywacke, South Scotch Highlands. 
+ Felstones, from Kirkcudbright. 
| Hornblende Schist with eyes of Quartz, 
probably from South Scotland. 
Derived from 
S. Scotland. 
Though this list contains a preponderance of Lake 
district rocks, this is due to the greater number of recog- 
nizable rocks there, but numerically the Scotch erratics 
are by far the more important; Mr. Goodchild expressed 
some surprise at the high percentage of Scotch greywackes 
and felstones in the collection. 
Of boulder clay I have been unable to find any trace, 
though there is plenty on the adjoining coast of Anglesey, 
well shown in the cliff sections between Penmon and 
Beaumaris, where fragments of shells may be found in it. 
Glacial strie were first discovered on the island—at 
least, I have not been able to meet with any previous 
record—by Professor Carvill Lewis during the recent visit 
of the British Association. They were first noticed on a 
rock surface (since marked with a star of white paint) 
* Strahan records Crifell granite from Mold. Quar. Jour. Geol. Soc., vol. 
xlii., p 380. 
