284 MISS G. L. ELLES AND MISS E. M. E. WOOD ON THE [May 1 896, 



(/3) Hillside-sections. — On the hillside, immediately above, the 

 exposures yielded several graptolites, belonging, however, to but 

 few species: Monograptus priodon, Bronn, M. per sonatas ^ Tullb., 

 M. vomerinus, Nich., and M. flexuosus, Tullb. 



This exposure was traceable, with interruptions, round the hill to 

 above the lodge leading to Benarth Asylum. 



(y) Shore-section. — The section of Wenlock Shales exposed on the 

 shore at low tide is very complete. These beds first appear just 

 below the end of the lodge garden, and continue for some distance 

 along the shore. The lower beds are very shivery in character, but 

 as higher beds are reached they become more compact and finally pass 

 up into the hard flagstones with intercalated grit-bands belonging 

 to the series of Denbighshire Grits and Flags. The following 

 fossils were obtained : — Monograptus priodon, Bronn ; M.personatus, 

 Tullb. ; M. vomerinusj Nich. 



4. The Denbighshire Grits and Flags. 



The boundary-line between the Wenlock Shales and the Den- 

 bighshire Grits and Flags east of the fault (F. 2) is approximately 

 correct ; but between this fault and the western limit exposures are 

 rare, and the boundary cannot be fixed with any accuracy. Quite 

 near the western fault exposures are more abundant, and the 

 alteration of strike near the line of disturbance is perfectly evident. 



Y. CoBEELATION WITH OTHEE AeEAS. 



1. The Llandovery Rocks. 



The general character of the graptolites found on the bank of 

 the stream and in the road-section shows that the beds are nearly 

 related to the Upper Birkhill Shales of Southern Scotland, and also 

 to similar beds occurring in the Lake District and elsewhere. 



We do not think that it is possible to trace at Conway all the 

 minuter subdivisions recognized at Moffat, but certainly our highest 

 band (No. 6 of the stream-section) corresponds with the uppermost 

 zone of the Birkhill Shales, namely with the zone of Rastrites 

 maximus. The bands below (Nos. 2 and 4) may subsequently be 

 found to be the equivalents of lower zones, but in the present state 

 of our knowledge it is wisest to say only that the beds contain 

 an Upper Birkhill fauna. The following table shows the species 

 common to the beds in various areas : — 



