Yol. 69.] LOWER PALEOZOIC ROCKS OF THE CATJTLEY DISTRICT. 7 



Phacops rnucronatus, a form which extends upwards into the Ashgill 

 Shales, and also into the Stockdale Shales. It is probably the same 

 band as that mentioned just below the Ashgill Shales of Backside 

 Beck : its significance will be noted later. 



The succeeding ' pencil-slate ' Ashgill Shales are quite like those 

 of Backside Beck and other localities in the district, and contain the 

 usual fossils. Xear the top is more than one band with Phylloporce 

 hisingeri, as in Backside Beck. Above these come several feet of 

 normal Ashgill Shales, with Platystrophia biforata Schloth. and> 

 other brachiopods, and also several Phyllocarida. In the shales is. 

 a calcareous grit, or possibly more than one, containing brachio- 

 pods, and resembling the grit described by Prof. Hughes at the 

 junction of Spengill and Stockless Gill. At that place the bed 

 seems to be now covered up. 



The north-eastern dome. — The beds of this dome are much 

 faulted, but the Caradocian strata, as a whole, occur in the centre,, 

 and are well developed in Sally Beck and its valley-sides. The beds- 

 are generally similar to those of Backside Beck ; but, as many 

 exposures are seen where the rocks are weathered, the fossils- 

 here are more easily extracted. The principal localities are at 

 the bottom of Green Lane, east of Murthwaite, on the left bank 

 of the beck ; and Sally Brow, near Murthwaite, on the right bank.. 

 The following fossils have been obtained, those from Green Lane 

 being numbered 1, and those from Sally Brow 2 : — 



Lindstroemia. 2. 



Heliolites tuhulata Lonsd. 2. 



Cystidea. 2. 



Trinuclcus seticomis ('!). 



Ampyx. 1. 



Acidaspis cf. dalecarlka Ttirnq. 1. 



Acidaspis sp. 2. 



Stygina. 1. 



Illcenus. 1, 2. 



Cybele rugosa Portl. 1 . 



Cybele verrucosa Dalm. 1, 2. 



Calymene planimarginata. 1,2 (very 



common). 

 EncrinurusmultisegmentatusVortl. 2. 



Proetus. 1, 2. 



Homalonoius sedgwicki Salt,. 2 (com- 

 mon). 

 Cheirurus octolobatus M'Coy ? 2. 

 Phacops robertsi. 2 (two specimens). 

 Lingula. 2. 



Platystrophia biforata. 2. 

 Orthis elegantula Dalm. 1, 2. 

 Orthis vespertilio Sow. 1, 2. 

 Orthis porcata M'Coy ? 1 . 

 Plectambonites sericea. 1 , 2. 

 Triplegia insularis Eichw. 2. 

 Tcntaculiies anglicus. 2. 



These beds undoubtedly yield the fauna of the Calymene Beds, 

 but the presence of Phacops robertsi suggests that the beds of Sally 

 Brow are high up in that group. Farther down stream the section 

 has not been entirely unravelled. The beds begin to dip down 

 stream, and continue with this general southerly dip until near 

 Rawthey Bridge, where they turn over and dip north-westwards. 

 It would, therefore, seem that, apart from complications, we are 

 dealing with a syncline. In the southern limb, to be presently 

 described, the succession is clear and continuous; but in the northern 

 limb it is obscure, and we have only fossils from one locality, 

 namely, the footbridge across Sally Beck, over which is the path to 

 Murthwaite. Fossils were found here by Mr. Middlebrook. The 



