132 ORGANIC REMAINS. 



REMAINS OF FISHES AND REPTILES. 



A FINE specimen of the palatal teeth of some fish, in five rows, was found in Slingsby 

 quarry, and sent by the Earl of Carlisle tp the Museum of the Yorkshire Philosophical 

 Society. Two of the teeth are shewn, Plate IV. fig. 22. 



Remains of ichthyosaurus occur in the oolite of Malton, especially vertebrae and 

 teeth. A fine specimen of the lower jaw of a genuine crocodile, very like one found 

 at Caen, and in Northamptonshire, is in the valuable collection of Malton fossils be- 

 longing to the Yorkshire Philosophical Society. 



ON REVIEWING the preceding list of more than one hundred and 

 twenty species of fossils from the coralline oolite of Yorkshire, some 

 general results present themselves, which deserve the attention of geolo- 

 gists. First, it is remarkable that though many of the species are re- 

 peated in the oolitic strata below, none are found in the Speeton clay 

 above : a result which harmonizes exactly with the observations made 

 on the same strata, in the south of England. If the fossils of the Kim- 

 meridge clay could be collected in sufficient variety, possibly we might 

 find in Yorkshire, as in the vicinity of Weymouth, some species which 

 are also found in the oolite ; but this must only be expected at the base 

 of the clay in stony layers, almost in contact with the rock. (See Smith's 

 account of the Kimmeridge (Oaktree) clay in strata identified, p. 18.) 



Secondly, it is interesting to observe how large a proportion of the 

 remains of mollusca are common to both the calcareous grit and the 

 coralline oolite in Yorkshire and Oxfordshire. This result is also per- 

 fectly in unison with the conclusion which suggests itself, in considering 

 the other geological relations of these rocks : for the frequent alternation 

 of calcareous grit and limestone beds at the bottom of the oolite, (see the 

 account of Filey Brig, page 78,) and the recurrence of calcareous grit 

 above the oolite, leave no doubt of the propriety of uniting these rocks 



