THE OOLITES. 



137 



neighbouring sea. The reptiles of this age, Omo- 

 saurus and Pliosaurus y are like those of the Oxford 

 it a great Megalosaurian, named StrepUh 

 Spondylus % has also been found at Weymouth and 

 Malton in Yorkshire. 



The Kimeridge Clay. — The reef of limestone at 

 Upware appears to be a dividing point for the 

 Kimeridge clay, which comes next in vertical suc- 

 cession. In Cambridgeshire it is about 40 feet 

 thick, but thickens south-west to Dorsetshire to 

 more than 600 feet thick, and its northern thick* 

 ening to Yorkshire is a IS great. This clay 



contains inflammable beds known as Kimeridge 



1., which divide into thin sheets like paper, and 



are full of marine fossils. In 1 1 lire the clay 



fuel, and has been used in making 



paraffin candles, and to produ< »r illumina- 



ShoUverHifl 



FlO, 84.— Section dl n of strata east of Oxford. 



tion of the neighbouring villages. These clays 



full of be< QS of earthy lime- 



, nurd septaria, which are each 2 or 3 feet 

 in diameter. 



The oldest known representative of the Iguan- 

 odon is found in this clay at Cumnor. And be- 

 tween Ely in Cambridgeshire and Swindon many 

 fossil reptiles are found, such as Teleosaurian 

 crocodiles, peculiar turtles and Ichthyosaurs. 

 Colymbosaurus is a long necked Plesiosaur with 

 single heads to the neck ribs, distinguished by the 

 massivene^s of its arm bones, and by having three 



