136 ORGANIC REMAINS. 



ANNULOSA. 



Dentalium ... ... PL IV. fig. 37- Cay ton. 



Serpula lacerata ... ... fig. 35. Scarborough, 



A CONSIDERABLE proportion of these fossils belong to the upper 

 solid beds which are in contact, and sometimes alternate, with the base 

 of the coralline oolite. It has been remarked above, that the zoological 

 characters of those two rocks are much in unison, and there are very 

 few species of frequent occurrence in the calcareous grit, which are not 

 also discovered in the limestone above. A few fossils, which are not 

 among the most common in the calcareous grit, as galerites depressus, 

 mya literata, and turritella muricata, are repeated in the cornbrash and 

 oolites below it ; others, as spatangus ovalis, terebratula socialis, belem- 

 nites sulcatus, and ammonites perarmatus, are found as low as the Kel- 

 loways rock ; and sanguinolaria undulata and crassina carinata ? have 

 been met with in the Oxford clay ; but a considerable number remain, 

 which are so constantly associated with this rock, that they may 

 be employed to identify it in a case otherwise doubtful. Such are the 

 crinoidal columns, isocardia tumida, modiola bipartita, pinna lanceolata, 

 pecten vagans, lima rudis, gryphasa bullata, and ammonites vertebralis ; 

 not to mention several rarer species, of which the value in characterizing 

 the rock remains to be ascertained. 



Mr. Murchison's paper, to which I have already referred, on the 

 the geology of Brora, affords an opportunity of applying these results, 

 to determine the geological relation of the rubbly limestone and sand- 

 stone of Braambury hill, the uppermost stratum of that district. In its 

 position with respect to other conchiferous beds there, it agrees with the 

 calcareous grit of Yorkshire, and amongst the fossils which Mr. Mur- 

 chison has there collected, we find gryphaea bullata, ? modiola bipartita, 

 pecten vagans, and ammonites vertebralis. Of these I have had the 

 opportunity of consulting specimens, which the liberality of their dis- 

 coverer has placed in the museum of the Yorkshire Philosophical 



