484 Dr. J. E. Marr — llie Dufton and Keisley Groups. 



Beginning with the east quan-y, we find an anticlinal foki exposed 

 at its northern face, with black shales and limestones in the centre. 

 At its westei'n end these black limestones and shales are seen in 

 a series of folds, as exhibited in the accompanying section, and their 

 relationship to the Keisley Limestone clearly shown. It will be 

 seen that, save for a wisp of shale, the highest bed of the dark series 

 is a limestone. 1 have long known these beds, and believed them to 

 belong to the Dufton Shales, and it is noteworthy that a calcareous 

 baud forms the summit here as in Swindale. All doubt as to the 

 Dufton age of the beds has been set at rest by Mr. Fearnsides' 

 discovery of fossils in some calcareous shales belonging to the group, 

 in some excavations which he made on the hill-side about 20 yards 

 west of the quarry at the point marked ^ on the plan. The following 

 is a list of fossils obtained from these excavations : — 



Fleet amhomtes siricea, Sow. 

 Trinucleus seticornis, His. Common. 

 Cybele vermcosa, Dalm. Common. 

 Calymene senaria, Conrad. Common. 

 Proetus cf. ramisulcatus, Niesk. One 

 specimen. 



One specimen. 



Stromatoporoid ? 



Streptdasma ? Common. 



Heliolites ttibulata, Lonsd. Common. 



Heliolites sp. One specimen. 



Dalmanella sp. Rare. 



Orthis Actonitr, Sow. Common. 



Flaiyitrophiabiforata, Schloih. Common. Dalmanites 9^. 



Tripleiia spirt feroides, M'Coy. 



The fauna is clearly that of the Dufton Shales. The three 

 common trilobites are those which are found in great abundance in 

 the Dufton Shales of other exposures. Most of the other fossils 

 have also been recorded from those shales, and those which have not 

 are (with the exception of the Dalmanttes, which is possibly new) 

 found in the corresponding Sleddale Group of the Lake District. 

 The supposed Stromatoporoid is clearly identical with a form 

 recorded by Salter ^ from Coniston under the name of Siromatopora 

 striatella, D'Orb. 



-Section across west end of Dufton Inlier, showing folds. 

 Scale 1 inch = about 12 feet. 



k. Nodular Keisley Limestone. 

 d. Limestones of Dufton Beds. 

 «. Shales of Dufton Beds. 



We may now pass on to the consideration of the west quarry. 

 A crush belt with broken and silicified limestone crosses the floor 

 of this quarry in a general W.N.W.-E.S.E. direction, with highly 



1 Cat. Camb. and Sil. Foes., p. 40. 



