RECENT GEOLOGICAL WORK AT THE LIZARD. 
113 
RECENT GEOLOGICAL WORK AT THE LIZARD. 
ABSTRACT OF LECTURE BY HOWARD FOX, F.G.S. 
(Read 29th March, 1888.) 
The Lecturer commenced by assuming that his audience were 
accompanying him along the coast of the Lizard district in 
small boats, and thereby able to land and examine various 
junctions and sections of interest which could only be reached by 
water. Beginning at the Polurian Cove junction of the Silurian 
slates with the massive hornblendic schists on the west coast, the 
party were supposed to row round the Lizard to the other 
coast junction of slates and schists immediately east of Porthallow, 
in Falmouth Bay. A series of the 25-inch parish maps, coloured 
geologically by the lecturer, enabled him to point out the most 
interesting spots, and to indicate where exposures of various rocks 
not hitherto recorded might be seen. 
The Pare Bean serpentine extended 300 yards inland, and 
150 yards along the foreshore. It was 500 yards south-west 
of Lower Pradanack farmhouse. On the cliff above the cave 
junction of the schist and serpentine at Ogo Dour (Ugethawr) 
a band of limestone was found weathering in ridges. At Vellan 
Head several dykes were seen traversing the serpentine cliffs, and 
causing much disintegration, often accompanied by banded series 
of quartzose, crypto-crystalline, and serpentinous rocks of various 
colours, from light green to bright brick-red. Some of the dykes 
were porphyritic. Passing the fine serpentine arch to the north 
of the " Horse " promontory, reference was made to the schist 
found between the Rill Head and Rill Ledges. Macroscopically, 
this resembled mica -schist, but was in reality a tremolite- schist. 
The gabbro vein east of Kynance Cove, with its accompanying 
mass of saussuritic rock, was described, and the arch and cave 
adjoining, which could only be seen from the water. Immediately 
east of the Lion Rock banded crystalline rocks, similar in 
vol. x. i 
