FOSSILS OP NORTH BUCKS AND ADJACENT COUNTIES. 
483 
Cardiuin striatulum, Sow. 
Astarte lineata, Sow. 
„ Hartwelliensis, Sow. 
Thracia depressa, Sow. 
Ostrisa deltoidea, Sow. 
„ Iseviuscula, Sow. 
„ gregaria, Sow. 
Pinna granulata, Sow. 
Pinna. 
Perna quadrata, Sow. 
Trigonia costata, Pa7'k. 
Modiola. 
Panopsea. 
Pecten arcuatus, Sow. 
Pecten. 
Serpiila socialis, Gold/. 
Gryphaea rostrata (?) Fhil. 
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 Wol- 
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 Cerithium Da- 
ononis, 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, 
* Geologist, vol. iv. page 214. 
t Damon. 
II II II II II 
•optxoo 
