PREFACE. Vll 



(5) The curious resemblances of the Upware group of oysters 

 to the well-known Jurassic species 0. dilatata, deltoidea, nana 

 and gregaria. 



(G) The profusion of Brachiopod shells, both species and 

 specimens at Brickhill and Upware and the graduation of the 

 various types (species) into one another (p. 22). 



(7) The similarity of the Upware and Brickhill fossils to 

 those of the Neoconiian beds of the Brunswick area at Shop- 

 penstedt and Berklingen (p. 73). 



(8) The existence of a large ' derived ' fauna in the coprolite 

 beds, these being to a great extent much worn and otherwise 

 mutilated remains of shells, &c, washed out of the rocks of the 

 old coast lines, of Neocomian to Oxfordian age. 



(9) The very general — almost invariable — phosphatization of 

 these remains. 



(10) The great similarity of the ' derived ' Neocomian phos- 

 phatic nodules over wide areas. 



(11) The occurrence of a 'derived' Neocomian fauna in beds 

 of very nearly the same age, and the evidence of the rapidity of 

 their fossilization, exhumation and redeposition. 



(12) The evidence that the Vertebrate remains of Upware 

 are, in great part, truly Neocomian species, native to the deposit 

 in which they are found ; while others are derived. 



(13) The curious difficulty in determining the age of some 

 of the Fishes' teeth ; and the probable identity of form of some 

 of the palatal teeth of Jurassic and Neocomian species ; and 



(14) The importance of distinguishing the Downham Market 

 Phosphate Bed from the Ironsand and Phosphatic series as belong- 

 ing to a separate Physical Group (pp. 11, 54). 



My general conclusions as to the age of the Ironsand and 

 Phosphatic series are in near accordance with the opinions of 

 MM. Walker, Teall, Meyer and Barrois, all of whom have placed 



