690 ITR. J. E. MAER A2?T) DE. H. A. jniCHOLSOy 



In most cases, however, the usual strike-fault runs up the bed of 

 the stream, and the Middle Skelgill Beds are developed only on the 

 right bank. About halfway between the railwaj'-bridge and a 

 waterfall which flows over the smashed Lower Skelgill Beds is a 

 precipitous cliff-section on the right bank, and at the base of this 

 a few feet of much-broken shale of the fimhriatiis-zone occur above 

 the fault, having a gentler dip than the Lower Skelgill Beds of the 

 opposite side of the stream. 



Ah 2. Above these fimhAatus-sh^Q^ about 4 feet of mudstone of 

 the Encrinurus-punctatus zone can be measured ; but the junction 

 with the fimhriatus-%\iQ\es, is not seen. 



Ah 3. The most interesting feature of this gill is the occurrence 

 therein of the argeiiteus-zojie, as this is the only section other than 

 the typical one in which we have found it. It is a little thinner 

 than at Skelgill, being only 6 inches thick, and is more strongly 

 cleaved than at that place : but in the centre runs the remarkable 

 pale green streak, one quarter of an inch thick, which is also found 

 at Skelgill at a distance of 7 miles in a direct line. 



Owing to the cleaved nature of the rock fossils are difficult to 

 procure ; but we found 



Monograptus argenteus, Nich. 



leptotheca, Lapw. 



cyphus, Lapw. 



Diplograptus sinuatus, Nich. 

 Petalograptus oTatus, Barr. 



The first-named occurs in considerable quantity. 



Ah 4. Six feet of the zone of PJiacaps glaber is seen above the 

 argenteus-zone. It has the usual calcareous nodular bands, as has 

 the j^unctatus-zone in this section. A fault is seen above this with 

 what are apparently some of the convolutus-shales crushed in the 

 fissure in one place ; but the next zone which is well developed is 



Ac 2, the zone of Ampyx aloiiiensis. so that the convolutus-zone, 

 the Barren Band, and the Clingani-band are here cut out. 



At the waterfall the section is similar, the very top of the Encri- 

 nirrus-punctatus zone only is found above the fault, and this is suc- 

 ceeded by the argenteus-zone, which is close to the stream at the 

 head of the fall, and is succeeded by some Phacops-glaher mudstones, 

 after which the second fault brings the zone of Ampyx aloniensis 

 against these. 



Ac 3. The sp>i7iige'rus-sha\es of normal character, but somewhat 

 crushed, 2 feet thick, but possibly some crushed out altogether. 

 They contain abundance of Monograptus spinigerus, Nich., along 

 with M. lohiferus, ll'Coy, M. distans, Forth, Diplograptus tamaris- 

 cus, Xich., &c. 



Ac 4. The zone of. Acidaspis erinaceus is from 8 to 10 feet thick 

 so far as can be seen, and the mudstones pass up into the BrowgiU 

 Shales. 



The beds of the last two zones are seen on the moorland on the 

 right bank and a turn in the stream causes the beds of the erinaceus- 

 zone to strike into the stream, where the Browgill Beds overHe them. 

 Twenty-one feet of pale green shales are succeeded by a black band 



