FOSSILS OF NORTH BUCKS AND ADJACENT COUNTIES. 



Cardiuni striatal um, Sow. 

 Astarte lineata, Sow. 



„ Hartwelliensis, Sow. 

 Thracia depressa, Sow. 

 Ostrsea deltoidea, Sow. 



„ loeviuscula, Sow. 



„ gregaria, Sow. 

 Pinna granulata, Sow. 

 Pinna. 



Perna quadrata, Sow. 

 Trigonia costata, Park. 

 Modiola. 

 Panopsea. 



Pecten arcuatus, Sow. 

 Pecten. 



Serpula socialis, Gold/. 

 Gryphsea rostrata (?) Phil. 

 Trigonellites. 



The extensive museum of Dr. Lee, of 

 Hartwell Park, contains many beautiful 

 fossils from the neighbourhood, and is 

 well worth a visit. The fossils from the 

 Kimmeridge clay are frequently spark- 

 ling with iron-pyrites ; and thus they 

 are almost unrivalled in beauty and de- 

 licacy; generally they are beautifully 

 perfect and entire. 



The Middle Oolite represented in 

 this district merely by one member, 

 viz. the Oxford clay, next makes its 

 appearance. It is a bluish or leaden- 

 coloured clay, sometimes laminated, 

 and with frequent bands of concretions ; 

 it contains fewer fossils than any other 

 formation in the district, with the ex- 

 ception of the Northampton sand, which 

 has very few indeed. 



In a former notice* I have briefly 

 described the Oxford clay of the neigh- 

 bourhood of Newport-Pagnel and Wdl- 

 verton ; so that very few words are 

 here necessary. The most important 

 point in its palaeontology is the occur- 

 rence of marine reptiles (Ichthyosauri 

 and Plesiosauri) ; the other fossils, 

 with the exception of Gerithium Da- 

 monis, being common everywhere in 

 this formation. This little shell,t which 

 is tolerably abundant in the Oxford 

 clay of Dorsetshire, but which, I be- 

 lieve, has not been found elsewhere, 



35* 



is i; § 



ill 



n m H o o ^ 



eS S U § § 



M O O Jj e 



II || II II II 



*<>IWI 0 0 



* Geologist, vol. iv. page 214. 

 f Damon. 



