186 MISS G. 1. ELLES ON THE KELATION OF THE [May IQ09, 



The commonest forms at these localities are the following : — 



1 (i) River-Bank. 



Rastrites maximus, Carr. 

 Monograptus turriculatus, Barr. 

 Monograptus Tialli, Barr. 

 Monograptus beclci, Barr. 

 Monograptus gemmatus, Barr. 

 Monograptus cf. speciosus (?) Tullb. 

 Monograptus nudus, Lapw. 

 Monograptus rigidus, Lapw. 

 Climacograptus extremus, H. Lapw. 



1 (ii) Marsh. 

 'Rastrites maximus, Carr. 

 Monograptus turriculatus, Barr 

 Monograptus beclci, Barr. 

 Monograptus pandus, Lapw. 

 Monograptus halli, Barr. 

 Monograptus galaensis, Lapw. 

 Monograptus nudus, Lapw. 

 Monograptus rigidus, Lapw. 

 Monograptus runcinatus, Lapw. 



The beds belonging to the Zone of Monograptus crispus are best 

 seen exactly opposite the Castle, on the road leading to Benarth : 

 they have yielded the following graptolites in some abundance : — 



Monograptus crispus, Lapw. ' Monograptus cf. dextrorsus, Tullb. 



Monograptus exiguus, Mch. Monograptus marri, Perner. 



Monograptus turriculatus, Barr. | Monograptus galaensis, Lapw. 



ograptus nodifer, Tullb. Petalograptus palmus, Barr. 



Monograptus gemmatus, Barr. ' Petalograptus cf. ovatus, Barr. 



Monograptus rigidus, Lapw. 



Descending to the shore from the road, it is clearly seen that 

 these beds are succeeded by a belt of pale shales, which appear to 

 have no black bands and to be unfossiliferous ; but close below the 

 commencement of Benarth Wood black bands come in again, and 

 have yielded the characteristic graptolites of the Zone of Mono- 

 graptus crenulatus. These beds become flaggy towards the top, 

 and seem to constitute a passage into the overlying Benarth Flags 

 and Grits. 



(7) Benarth Flags and Grits. 



The Benarth Flags and Grits are best displayed along Benarth 

 shore, on the west side of the Biver Conway, where they immediately 

 succeed the highest members of the Gyffin Shales. The structure 

 of this part of the country is clearly brought out when mapped on 

 the 25-inch scale ; but inland the exposures are not sufficiently good 

 to render it possible to plot all the folds with the same certainty. 

 The beds are sharply folded for the most part in a series of steep 

 isoclines, although these are not perfectly uniform, owing to the fact 

 that the grits have ' held ' better than the flags ; there are, in 

 addition, a few minor faults (? thrusts). 



Immediately above the highest Gyffin Shales are seen a series 

 of flaggy beds with calcareous concretions ; these beds are exposed 

 for about 200 yards, and yield plentiful examples of Cyrtograptus 

 murchisoni, Carr., Monograptus vomerinus, Nich., M. priodon^vonn., 

 and Gladiograptus geinitzianus, Barr. ; it is, therefore, perfectly 



i These exposures are not now so workable, as at the time when Mrs. Shake- 

 spear (Miss B. M. R. Wood) and I first came to the district. The above lists 

 have been drawn up mainly from our earlier collections, and are revised up to 

 date. 



