Pollitrian Coast, Cornn-all. 559 



attention at first to the extensive folding of the rocks at Pollurian, 

 which gradually loses itself as we pass nortliward in a series of 

 lengthening S.E.-N.W. folds, finally dying away at Porthleven into 

 more or less horizontal beds as we approach Trewavas. Minor 

 contortion is ignored. 



On the north side of Pollurian Cove we see black slates with 

 inclusions of grit and limestone lenticles, the Vervain Peds of the 

 Survey.-^ The limestone lenticles seem rare at Pollurian itself, but 

 occur abundantly in Gunwalloe Cove and in Jangye Ryn, north 

 of Gunwalloe Cove. No fossils have yet been found in these lenticles 

 at this spot, but we found one lenticle in Gunwalloe Cove itself 

 so crushed as to show a cone-in-cone structure'^ which would totally 

 destroy any vestige of organisms, and in this particular these 

 lenticles differ from those found at Porthluney and Porthalla, which 

 contain Silurian fossils. These Yeryan Beds form the bulk of the 

 cliff on which stands the Wireless Telegraph Station of Pol Dhu, 

 the base of the Towan Cliffs, the base of Castle Hill, on which 

 Gunwalloe Church is built, and rise again on the south side of 

 Jangye Ryn, the crest of their arch appearing on the shore, while 

 the denudation of the softer overlying and crushed arch of 

 Porthscatho Beds has caused a little S.E.— N.W. cove, as seen on 

 the Ordnance Survey map. The crush at this point appears to have 

 been excessive, for we seem to find pieces of Porthscatho Beds 

 in the top layer of the underlying Veryan. In Jangye Ryn 

 itself the Veryan Beds are seen here and there along the shore 

 with lenticles of bluish-grey limestone full of quartz veins, 

 but the beds gradually die out and are probably last seen in 

 Helzcphron Cove. 



The Porthscatho Beds first appear in the road leading down to Pol 

 Dhu Cove from the hotel ; they form the upper part of the Towan 

 Cliff, Castle Hill, nenrly the whole of Jangye Ryn, and the coast to 

 Tremearne Cliffs. They are highly contorted, thrown into sharp 

 folds at Jangye Ryn, and, as we pass north, gradually into longer and 

 longer S.E.-N.W. folds, until at Porthleven they become fairly 

 horizontal and form bold cliffs of grit, breaking up into cubes and 

 tables (much like the South Lizard Hornblende Schists) as one nears 

 Trewavas. 



" At Gunwalloe Pishing Cove we see a small infold of the Falmouth 

 Slates, and other infolded patches of these slates are met witli in the 

 coast section at the base of the cliffs between Gunwalloe Fishing Cove 

 and a point a quarter of a mile south of Looe Bar, while traces can 

 still be found north of Looe Bar infolded among ^ the Upper 



^ The " Mylor- Veryan " of Green (95 Ann. Eep. Eoy. Cornwall Geol. Soc, 

 1908, p. 7). We now recognize the " Mylor " Beds of the Survey to be the 

 upper part of the Porthscatho Series, which, if needing a special name, can be 

 called ' ' Mylor " . 



- Portions of this specimen are now preserved in the Brit. Mus. (Nat. Hist.) 

 and in Jermyn Street Museum. In Pollurian Cove we found a thin band in 

 the Veryan containing discs of limonite after iron pyrites about 12 mm. in 

 diameter ; these are comparable to the ' coal-money ' found in the North of 

 England (L. J. Spencer). Specimens of this rock also have been given to the 

 above-mentioned museums. 



