446 J. E. Mar) — On the Coniston Limestone. 



forward eagerly to the publication of the evidence on which he 

 relies, as the position of the Eycott group is one of the most important 

 problems in Cumbrian Geology, and there are serious difficulties 

 in the supposition that the equivalents of the Eycott Hill rocks are 

 anywhere intercalated between beds containing the Corona fauna. 



I may here correct one statement made in our paper on the Cross 

 Fell Inlier. The volcanic rocks south of Lycum Sike (which are 

 very rotten) are not the Dufton rhyolitic rocks. As they are 

 faulted against the beds further north, their position does not, 

 however, aflFect the main question as to whether volcanic rocks occur 

 intercalated between two sets of strata containing Trematis corona. 



The term Corona beds is objected to, because of the stated inter- 

 calation of volcanic rocks between two Corona beds, and because 

 " Trematis corona occurs in the Coniston sliales in several localities." 

 I cannot see that the term is inappropriate, even if an intercalation 

 of volcanic rocks splits them up (which we do not admit). As to 

 the occurrence of Corona in the Coniston shales, we maintain that 

 it is limited to that portion of the Coniston shales which we have 

 termed " Corona beds," and shall continue to do so until definite 

 evidence to the contrary is adduced, for the fauna of the Corona beds 

 is quite different from that of higher members of the Coniston 

 Limestone series. 



Mr. Goodchild fails to see any reason why the Corona beds " may 

 not be contemporaneous " with the Drygill beds of the Caldbeck 

 Fells. A very good reason is that they only contain one fossil in 

 common, viz. the Brachiopod Orthis testndinaria, which ranges 

 through Llandeilo and Bala rocks, and that the other fossils indicate 

 a different horizon from that occupied by the Corona beds. 



The Craven area. — Little need be said concerning the rocks of 

 this area. My expression of opinion as to the age of the Jngleton 

 green slates is of little value until the evidence is published, and 

 1 should not have ventured any opinion had that of previous writers 

 been unanimous. I have, however, at various times, both alone 

 and in company with Prof. Nicholson, examined the rocks of the 

 Ingleton area with a view of finding the asserted passage from the 

 Ingleton green slates into the Coniston Limestone series, and have 

 seen no proofs of such passage. 



The Ingleton green slates, or rather the coarser bands in them, 

 are marked by an abundance of detrital mica, a mineral which is 

 conspicuous by its absence amongst the volcanic rocks of the Lake 

 District. Also, whatever the Ingleton slates are, they have under- 

 gone very considerable alteration by pressure metamorphism since 

 their deposition, a metamorphism which seems at first sight far 

 greater than that which affects the rocks of the Coniston Limestone 

 series. I am content to await the judgment of petrologists on this 

 point. 



The concluding paragraph of Mr. Goodchild's paper contains a 

 truism. But whether the persistent types of the Ordovician rocks 

 are found in Craven and within the Cross Fell Inlier is another 

 matter. I have not dwelt on the subject because I do not consider 



