430 PEOF. J. PEE3TWICH 05f A KEW SPECIES OF 



33. I^OTE on the Occurrence of a i^tew Species of Igfain^odon" in a 

 BricTc-pit of the Kimmeeidge Clay at CuMiS^OE Huest, three miles 

 W.8.W. of Oxford. By Prof. J. Peestwich, M.A., F.E.S., 

 JF.G.S, (Eead April 28, 1880.) 



The fact of this discovery was briefly announced in the Geological 

 Magazine for May 1879 *. Since then the further progress of the 

 works has made clearer the position of the seam in which the bones 

 were found, and shown more exactly its relation to the mass of the 

 Kimmeridge Clay and to the overlying Lower Greensand, about 

 which some doubt was expressed at the time. This and the many 

 fossils now obtained from the Igiianodon-se^m. must remove all such 

 doubt. 



The pit is situated to the left of the road leading from Oxford to 

 Cumnor, at the foot of an outlying mass of Lower Greensand, forming 

 a conspicuous and isolated hill rising to the height of about 500 feet. 

 The Kimmeridge Clay here immediately underlies the Lower Green- 

 sand, without the intervention of the Portland beds (which are 

 present on the other side of the Thames valley at Shotover), and rests 

 upon the Coral Eag, which crops out at a distance of a few hundred 

 yards both to the eastward and westward of the pit. 



A tramway driven into the side of the hill led to the discovery of 

 the bones in a thin sandy seam intercalated in the clay, and, at the 

 point where discovered, about 4 feet deep beneath the surface. 



The prolongation of the tramway, however, has now shown that the 

 sandy seam runs into the hill, dipping at an angle of from 3° to 4° ; 

 and by following up the beds till they pass under the Lower Green- 

 sand, it is evident that the zone to which the Iguanodon belongs is 

 about 34 feet beneath those sands. The following is a section of 

 the pit as it is now opened out in a length of 340 ft. : — 



Section at Cumnor Hurst. 



Vi^.KW. E.S.E. 



^ During my absence from Oxford in the Easter of that year, a workman 

 took a bagful of bones to Dr. RoUeston, who, perceiving their importance, 

 kindly secured them for the geological department. Every facility has been 

 afforded me, both by the owner and the manager of the works, to follow up 

 this interesting discovery ; and with the aid of my assistant, Hy. Caudel, a 

 large portion of the skeleton has now been recovered. 



