Xll INTRODUCTION. 



The coast was afterwards further examined by him in 1813 : in 

 1817, I had the advantage of accompanying him to Whitby and Scar- 

 borough, and was much occupied there with him also in 1 820. In his 

 Geological Map of Yorkshire published in 1821, the lines of chalk, 

 Kimmeridge clay, and coralline oolite, are traced with considerable 

 accuracy, but the lower beds are erroneously named, owing to the 

 anomalous character of the strata, which in this district represent the 

 oolites of Bath. The error, however, was quickly discovered by Mr. 

 Smith, and corrected in several copies of the map which I coloured for 

 his friends. In the same year he shewed me some fossils * collected 

 by him near Scarborough, which I immediately recognised as belonging 

 to the Kelloways rock ; but so cautious is this experienced geologist 

 in the application of his own rules, that he scrupled to rely on such 

 evidence of identity between two points so distant as the localities in 

 Wilts and in Yorkshire ; and it was not until 1824, that he satisfied 

 himself by a re-examination of the cliffs at Scarborough, with a particu- 

 lar view to their relations with other rocks, of the distinct existence 

 there, both of this and of most of the other members of the series which 

 lies between the coralline oolite and the lias. 



Having now obtained a correct view of the stratification of the 

 whole coast, he laid down the details of his observations on the map, 

 and communicated them in conversation to his friends ; but the only 

 account of these discoveries which has been published, was in the notice 

 taken of them in the Report of the Yorkshire Philosophical Society for 

 1824, and in a paper f on the Geology of Cave, which contains an 



* Ammonites calloviensis, ammonites Kcenigi, and the small variety of grypheea dilatata. 

 t Annuls of Philosophy, for June, 1826. 



