FOSSIL MOLLUSC A. 257 



In Northamptonshire numerous fossil mollusca 

 can be collected in the refuse of the iron-mines near 

 Northampton town, and also at Kingsthorpe, Durton, 

 and Blisworth. No fewer than one hundred and 

 twenty-five species have been catalogued from the 

 last neighbourhood. The " Northampton Sands " are 

 very rich in this class of fossils, having yielded one 

 hundred and forty-one species of bivalves, and thirty 

 species of univalves. 



The Oolitic strata of Yorkshire will similarly 



Fig. 238. GrypJuza incurva (Oolite). 



reward the student, and these are all easily accessible 

 from the various watering-places, such as Scarborough, 

 Whitby, and Filey. Among other localities which 

 are richly fossiliferous are Cloughton Wyke, Hundale 

 Hayburn Wyke, Gristhorpe, Cayton Bey, Pickering. 



In Lincolnshire the Oolitic beds are cut through 

 by the railway from Spalding to Lincoln, and in 

 proceeding to the latter place from Grantham we 



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