THK CKOSS FELL INLIER. 



511 



Scandinavia, and tlio Trenton Limestone of North America. As 

 the overlying Trltiiicleus-shalcs of the former region, and tlic 

 Utica Slates and Hudson-lliver beds of the; latter, can bo closely 

 paralleled witli the succeeding Dut'ton Shales of tho Cross Fell 

 district, it seems highly j)robahle that the Corona-beds may be on 

 about the same horizon as the j^i7/r?c/<m-limestone and the Trenton 

 Limestone. When the beds of Wales and tho Welsh border-land 

 have been worked out in greater detail, we may expect to find a 

 similar fauna recorded from beds situated between the Llandcilo 

 and Bala Limestones. 



(b) Dufton Shales. — We have already given a list of fossils from 

 these beds as developed in Swindale. The annexed list shows those 

 which we have obtained from other localities : — 



Diplo(j raj}tus truncatus, Lapw. 

 Acldaspis, n. sp. 

 Ampyx tef)-a(jo)ius, Ang. 

 Calymene scnaria, Conrad. 



Ci/bele Loveni, Linnrs. 



verrucosa^ Dalm. 



Homaloiiotus htsulcattfs^ Salt. 

 Liclias laxatus^ M'Coy. 

 Trinucleus concentricus^ Eaton. 



seticornis^ His. 



Youngia trispinosa ^ Nich. & Eth. 

 Leptcena sericea, Dalm. 



transversal is, Wahl. 



L'lnijula ovata, M'Coy. 

 Orthis hiforata, Schloth. 



testud'maria^ Dalm. 



vespert'dio, Sow. 



Stropliomena e.vpansa, Sow. 



Hurning Lane. 



Pusgill. 



Pusgill ; BiUy's Beck. 



Pusgill ; Hurning Lane ; 



Dufton Town Sike. 

 Dufton Town Sike. 

 Pusgill ; Dufton Town Sike. 

 Pusgill. 

 Pusgill. 

 Pusgill. 



Pusgill ; Hurning Lane. 

 Pusgill ; Hurning Lane. 

 Pusgill : Hurniug Lane. 

 Hilton Beck. 

 Hilton Beck. 

 Dufton Town Sike. 

 Pusgill ; Harthwaite Beck. 

 Diitton Town Sike. 

 Harthwaite Beck. 



Most of these fossils are common in the Coniston Limestone, the 

 Bala Limestone, and the Tri7iucleus-sh.ales of Sweden, and there is 

 no doubt that the Dufton Shales, if not actual representatives of 

 the Coniston Limestone, are far more closely allied to it thau to 

 the underlying " Corona-beds " with which they have hitherto been 

 associated. 



(c) Keisley Limestone. — As to the general age of this there is no 

 doubt. The group of fossils is essentially that of the Coniston 

 Limestone. At the same time, the occurrence of some forms which 

 have not been found nearer than the Chair of Kildare may indicate 

 that we have here a fossil zone which is not represented by fossili- 

 ferous beds in the central part of the Lake District. 



(d) Staurocephalus-i«)ie5^o>i<?, and (e) Ashgill Shales. — As these 

 beds are quite similar to the corresponding strata of the Lake 

 District, it is unnecessary to say anything further about them. 



