Jin JUccmnt of the JUbiitn Jfossils 

 Intcljj iiiscobmli at fflkcforii Jfitepnine, 



By R. BULLEN NEWTON, F.G.S., 



BRITISH MUSEUM, SOUTH KENSINGTON, LONDON. 

 (Read February 17th, 1S97.) 



THROUGH the enterprise of two lady collectors, Miss 

 Forbes and Miss Lowndes, I was enabled, some 

 few months since, to announce the presence of the 

 Acantlioceras mammillatum and the Hoplites inter- 

 ruptus Zones at Okeford Fitzpaine, in the County 

 of Dorset, (1) these well-known Cretaceous beds 

 representing the lowest portion of the Albian or 

 Gault deposits of this country and the continent, the first-named 

 being the older of the two. 



With the exception of Mr. Jukes-Browne's (2) contribution of 

 1891 very little has been published on the geology of this locality 

 or its immediate neighbourhood. At the date mentioned this 

 author reported some sands lying beneath the Gault between 

 Twyford and Childe Okeford which he regarded as of " \ 7 ectian " 

 or Lower Greensand age. Lithologically, this so-called " Vectian " 

 deposit corresponded very closely with what I described as 



(1) On the Identification of the Acanthoceras mammillatum and 

 Hoplites interruptus Zones at Okeford Fitzpaine, Dorsetshire. Geological 

 Magazine, 1896, p. 198. 



(2) Note on an Undescribed Area of Lower Greensand or Vectian in 

 Dorset. Geological Magazine, 1891, p. 456. 



