238 Correspondence — Rev. John Gunn. 



in which the mammillse are worn down, with one of the ElepJias 

 meridionalis : at the same time I am glad to have been the means of 

 calling attention to this singular coincidence with the discovery made 

 by Mr. Prestwich, of similar mammalian remains in the stone-bed 

 beneath the Coralline Crag at Sutton. 



As Mr. Lankester wishes " to see a list of mammalian remains, in 

 addition to the Mastodon teeth found in Mr. Gnnn's stone-bed," in 

 part performance — and because I cannot, after what has passed, expect 

 him to receive my account — I will send to the Geological Society's 

 rooms for his inspection an old shed tooth of the E. meridionalis, 

 which I obtained last Monday, when in company with Sir C. Lyell 

 and Mr, Leonard Lyell at the Horstead marl-pit, from the stony 

 bed. Besides this, I had obtained previously three fine specimens of ■ 

 molars of the E. meridionalis from the Horstead and Coltishall pits, 

 from the same bed, and another not referable to any recognised species 

 of elephant, and three basal portions of the horns of deer (not de- 

 scribed), and no other mammalian remains, except the Mastodon. 



With reference to this stone-bed, I beg to be allowed to add some 

 observations which I have made. It appears to lie upon an old land 

 surface of the Chalk, which dips on an average 29 feet in the mile. 

 This land surface seems to have been subaerial, in pai-t at least 

 during the successive deposits of the Tertiary beds, until it was en- 

 tirely submerged in the Glacial period ; and the animals, which lived 

 upon it were entombed in or beneath the stony-bed. It is a well 

 ascertained fact that the remains of the Mastodon are found immedi- 

 ately upon the Chalk or in the disturbed chalk-rubble, while those of 

 the elephant and deer are found among the stones derived from the 

 disintegrated Chalk. It appears to me, therefore, that this stony -bed 

 admits of sub-division, and that a long period of time may have in- 

 tervened between the deposition of the Mastodon and Elephant 

 remains, and that no evidence is afforded of the co-existence of these 

 two proboscideans in this locality. 



Upon this stone-bed, on the land going down, or the water 

 rising, whichever it might be, the fluvio-marine Crag was deposited, 

 which is, according to my experience, nearly non-mammaliferous ; 

 and on this ground I ventured to suggest that the stone-bed and the 

 fluvio-marine Crag, which have hitherto been considered one, and 

 named by Mr. Charlesworth Mammaliferous Crag, should be separ- 

 ated. It is difficult to make the above clear without the aid of a 

 diagram, and I propose to submit one, together with fuller details 

 relative to the order of succession of these and the associated beds, 

 to the Geological Society. 



I have to thank Mr. Fisher for the answer he has given relative to 

 the gravel on the south bank at Lopham ford. It is a matter of 

 opinion as to whether it is middle-drift gravel or valley gravel. I 

 visited the spot with Mr. Prestwich and Mr. Flower, and they both 

 remarked that the gravel bore a striking resemblance to that of St. 

 Acheul. John Gunn. 



Irstead Eectort, by Norwich. 



