Vol. 62.] IN THE CARBONIFEROUS ROCKS AT RUSH. 303 



Correlation of the ' Cyathaxonia-Beds' with the 

 uppermost beds of the Carboniferous Limestone on the 

 south-western border of the Midland area. — During a 

 short visit to Dr. Wheelton Hind, I had an opportunity of ex- 

 •amining the uppermost beds of the Carboniferous Limestone, 

 under his guidance, at a considerable number of localities lying on 

 the margin of the Limestone-mass. The actual thickness examined 

 cannot measure more than a few hundred feet, and exhibited two 

 types of faunal assemblage : 



(1) The rich brachiopod collecting-ground of Park Hill, Wetton, etc. 



(2) The Cyathaxonia-Beds of Bradbourne. 



(1) The Park-Hill fauna includes nearly all the brachiopods 

 found in the ' Cyathaxonia-Beds ' of the Rush sequence, and quite a 

 large number of forms are undoubtedly identical. Corals are scarce 

 at Park Hill, etc., but I found the same Aulophylloid Clisiojpliyllum 

 as that which occurs in R17/ and R18c, near Wetton, and a 

 Caninoid Clisiophyllid at Astbury, very similar to the specimen 

 recorded from R 21 d. 



(2) The Bradbourne Beds contain Cyathaxonia rushiana and 

 Amjolexi-Zaphrentis, even more abundantly than the Rush Beds. 

 A further point of resemblance is the occurrence of OladocJionus. 

 which Dr. Wheelton Hind pointed out to me as characterizing the 

 Bradbourne level. 



The relative position of these two types of strata in the Midlands 

 is not, as yet, definitely settled; but, from an exposure near Kniveton, 

 I am inclined to believe that the Bradbourne Beds immediately over- 

 lie the Park-Hill Series, and this conclusion Dr. Wheelton Hind 

 thinks probable, from a large experience of exposures at other points 

 of the area. 



The correlation of the ' Cyathaxonia-Beds ' of Rush with the top 

 of the Avonian in the Western Midlands is a fact beyond dispute, and 

 so striking is the resemblance that it seems highly probable that 

 the Rush and Western Midland beds belong to the same Province. 



4. The Carlyan and Kate Rocks ; (R 13 to R 16). 

 Fauna : — 



Corals : None. 

 Brachiopods : 



Convex- papilionaceous Chonetes 



(abundant). 

 Semireticulate Productus. 



Ortliothetes (?) 

 Seminuloid Athyrid. 



Such an assemblage could occur at any level above Z in the 

 South-Western Province. 



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