158 ORGANIC REMAINS. 



Ros^ellaria composita (Min. Conch.) ... PL IX. fig. 28. Blue wick and Bath oolite. 



Nautilus lineatus (Min, Conch, tab. xli.) Blue wick. 



Belemnites ... ... ... Ditto, and Cold moor. 



Ammonites. 3. striatulus (Min. Conch, tab. ccccxxi.) Blue wick, (rare.) 



2. (carinated and radiated) Ditto. 



3. (carinated, flat, involute) Ditto. 



ANKULOSA. 



Serpula deplexa (Bean, MS.) ... PL XI. fig. 3?. Blue wick. 



Vermicularia compressa (Young & Bird) PL XI. fig. 37- Ditto. 

 I cannot distinguish this species from 

 that in the coralline oolite. 



THE cornbrash limestone, slaty stone of Brandsby, middle oolite or 

 gray limestone, and inferior oolite or dogger, which together represent in 

 Yorkshire the oolitic formation of Bath, contain a numerous suite of 

 organic remains, agreeing very closely with those obtained from the 

 same strata in other parts of England. Many of these fossils have been 

 observed by Mr. Murchison in the analogous strata of Sutherland, and 

 by Mr. De la Beche and other geologists, in the oolites of Normandy and 

 Switzerland. In the vicinity of Bath, where this formation is the most 

 distinctly exposed, the organic contents of the several strata are ex- 

 tremely similar ; and, notwithstanding the valuable labours of Smith, 

 Sowerby, Conybeare, Miller, &c. their zoological characters require 

 further elucidation. The fossils of the middle or great oolite, in particu- 

 lar, are very imperfectly known ; and the term " forest marble" has been 

 (I think) applied to very dissimilar members of the series. In the midland 

 counties, the fuller's-earth rock of Mr. Smith does by no means furnish a 

 constant or well-marked line of distinction between the middle, great, or 

 Bath oolite, and the inferior oolite ; and I am decidedly of opinion, that 

 in the northern part of Northamptonshire, and throughout Rutland and 

 Lincolnshire, there is but one thick oolitic rock beneath the cornbrash, 



