﻿252 DK. A. VAUGHAN ON THE TALiEONXOLOGICAL [May 1905, 



occur are found also in the Bristol area, and they are associated in 

 the same way in the two areas. 



Briefly stated, the succession is as follows : — 



1. A series of transitional beds containing few fossils, the same 

 early representatives of a Cleistopora-famia, as those which are 

 found in the Modiola-Zoiie of the Bristol area. 



2. A perfectly-typical and abundant K 3 fauna, in which a 

 Modiola- oshmcod phase is developed. 



3. K 2 is poorly fossiliferous, but is succeeded by 



4. A good development of the lower part of Z , containing the 

 characteristic fossils in abundance. 



5. The upper part of Z x and the whole of Z 2 are extensively 

 dolomitized, wherefore fossils are scarce; there is, however, a 

 well-marked fossiliferous band containing a Z 2 assemblage, which 

 corresponds to the similar band in the Chepstow area. 



6. The base of C (the ' laminosa-dolomite ') contains a highly- 

 fossiliferous oolitic limestone (the ' Crease Limestone '), wherein the 

 fauna is identical with that which occurs at the same level in the 

 Bristol area, 



7. A succession of highly-interesting dolomites, but practically 

 unfossiliferous. 



8. A few thick limestone-beds (interstratiiied in many places 

 with crystalline dolomites). This limestone (the ' Whitehead 

 Limestone ') exactly resembles in its lithological character certain 

 beds of S 2 in the Bristol area, and since it contains the same fossils 

 (Semifluid, Productus, etc.) it can be unhesitatingly referred to the 

 Upper Seminula-Zone. 



9. The ' Millstone-Grit.' Hence, in this district, the lowest 

 ' Millstone-Grit ' is of Upper Seminula-age. 



(iv) The Clee-Hill Ahea. 



[I had an opportunity of examining the Carboniferous Limestone 

 in this area during the recent visit of the Geologists' Association to 

 Ludlow, under the presidency of Dr. A. Smith Woodward, F.R.S. 



There are several very interesting problems connected with the 

 peculiar development of the Carboniferous Limestone in this area ; 

 but these may be safely left in the hands of Mr. E. Dixon, who has 

 undertaken their elucidation. From my present point of view, the 

 main interest centres in the possibility of testing the value of the 

 faunal sequence which has been established for the Bristol area at 

 a point not far removed from the main Midland outcrop. 



The Cleistojwra-Zone may be dismissed at once, as showing the 

 normal character. 



The quarries at Oreton are of more interest, since they allow of a 

 comparison between the result of zoning by the assemblage of 

 brachiopods and corals, and that of zoning by the fish-facies. 

 In his * Notes on the Geology & Fossils of the Ludlow District,' l 



1 Proc. Geol. Assoc, vol. xviii (1904) p. 431. 



