180 MISS G. L. ELLES ON THE BELATION OE THE [May 1909, 



is seen, from their junction with the Ashy Grits of the Volcanic 

 Series below, to their passage into the Bodeidda or Trinudeus- 

 Mudstones above (see fig. 4, p. 178). The beds are somewhat 

 contorted and slickensided, and dip south-eastwards at a high 

 angle (60° to 80°) ; they are more or less fossiliferous throughout, 

 although the graptolites appear to be especially abundant in certain 

 bands. 



At the base of the section, at its north-western end, are seen 

 mudstones and shales with bands of ashy grits. The shale-bands 

 have yielded Gly ptograptus teretiusculus (His.), Mesograptus cf.. 

 foliaceus (Murch.) '?, Amplexograptus perexeavatus (Lapw.), Clima- 

 cograptus brevis, E. & W., CI. antiquus, Lapw., and CI. scharenbergi, 

 Lapw. ( = Locality 12: the locality -numbers correspond to those 

 indicated in fig. 4.) The ash-beds then become thinner and less im- 

 portant, finally disappearing, and the next highest beds seen are a 

 series of shales which contain the following fossils (Locality 11&): — 



Mesoqraptus multidens, Elles & 



Wood. 

 Orthograptus acutus, E. & W. 

 Gli/ptograpfus teretiusculus, var. 



euglyphus (Lapw.). 



Amplexograptus perexeavatus (Lapw.). 

 Climacograptus antiquus. Lapw. 

 Dicranograptus brevicaulis, E. & W. 



At a slightly higher horizon there occur (Locality 11) :- 



Glgptograptus teretiusculus (His.) 



and var. euglyphus (Lapw.). 

 Mesograptus multidens, E. & W. 



Amplexograptus perexeavatus (Lapw.).. 

 Climacograp>tus scharenbergi, Lapw. 



While still higher (at Locality 10) the beds are richly fossili- 

 ferous, and have yielded : — 



Dicranograptus brevicaulis, E. & W. 

 Dicellograptus sextans, var. exilis, 

 .E. & W. 



Dicranograptus furcatus, var. minimus,. 



Lapw. 

 Climacograptus scharenbergi, Lapw. 

 Mesograptus multidens, E. & W. 



The general aspect of this fauna strongly recalls that of the 

 higher parts of the Glenkiln Shales of the South of Scotland ; it 

 is probable, therefore, that the beds represent the Zone of Climaco- 

 graphis peltifer. It is worthy of note that, while both Mesograptus 

 multidens and Dicranograptus brevicaulis are present, they are 

 comparatively rare when contrasted with the abundance of the 

 Climacograpti. 



Flags and shales of similar lithological character succeed, and 

 have yielded the following faunas : — 



At Locality 9 : 



Mesograptus multidens, E. & W. Glyptograptus teretiusculus, var. 



(abundant). euglyphus (Lapw.). 



Amplexograptus perexeavatus (Lapw.). 

 At Locality 8 : 



Mesograptus multidens, E. & W. I Amp>lcxograptus perexeavatus (Lapw.). 



Climacograptus scharenbergi, Lapw. | 



