IGUANODON FOUND IN THE EIMMEEIDGE CLAY. 431 



ft. in. 



1. Coarse ferruginous sands and grit without 1 1. Lower 



fossils 10 Oj Greensand. 



«. Light-coloured clay 2 Q\ 



b. Dark grey clay with numerous layers of small I 



ferruginous and calcareous nodules and a j 



layer of large tabular Septaria, few fossils ... 18 ! 2. Kimmeridge 



e. Clay with band of fossils 14 f Clay 



d. Seam of clay laminated with white sand, Igu- 



anodon-hed 3 



e. Clay with large Septaria, lower down 4 -{-^ 



There is reason to suppose that the entire skeleton of the Iguano- 

 don was lying in a position across the driftway, in the thin but 

 conspicuous seam of clayey sand d ; but it was not until the removal 

 of great part of the clay that attention was directed to it, and it 

 was with difficulty that many of the bones were afterwards re- 

 covered. Unfortunately, the bones of the head suifered much in 

 the removal, and have been in great part lost ; but the vertebra) 

 and limb-bones, which are harder and more compact, are but little 

 damaged, and have been in great part recovered. 



Owing to the saudy and porous nature of the seam, the shells 

 found in it were mostly decomposed and difficult to recognize. One 

 very characteristic shell of the Kimmeridge Clay, although rare in 

 the Oxford district, occurs here in profusion, viz. Oryphcea virgida ; 

 with these have been found small species of Astarte and Pleuroto- 

 maria, a Trigonia, with specimens of TrigonelUtes latus, and Lingida 

 ovcdis. 



From the clay (e) below I have obtained Lucina lineata, Ichtliyo- 

 saurus (vertebrae and portion of ribs), Pliosaurus, BaJcosaurus 

 (1 tooth) ; while the clay above (c) is rich in the ordinary fossils of 

 the Kimmeridge Clay, as the following list will show : — 



Astarte. Pinna lanceolata. 



Cardium striatulum. Thracia depress. 



Lima. Trigonia gibbosa. 



Modiola bipartita. Pleurotomaria reticulata. 



Myacites recurvus. Ammonites bipiex. 



Pecten nitesoens. Serpula tetragona. 



Perna mytiloides. Yertebraj of Plesiosaurus. 



In the upper bed of clay (5) Ammonites hvpleco is tolerably common 

 also ; but the other fossils are not so numerous. It would appear 

 therefore that the horizon on which the Iguanodon occurred is in 

 the upper part of the Kimmeridge Clay of this district. It is here 

 greatly reduced from the great development it has south in Dorset- 

 shire ; for at Cumnor its total thickness cannot exceed from 70 to 

 80 feet. Largely as the Kimmeridge Clay is worked elsewhere in the 

 neighbourhood of Oxford, not a single bone of Iguanodon has 

 hitherto been found in it ; nor have the remains of Iguanodon been 

 found elsewhere lower in the geological series than the Lower 

 Greensand and Wealden strata of Kent and Sussex. 



One other instance, however, has recently came to my knowledge 

 of the occurrence of Iguanodon in the Oxford district. In the fine 



