322 ME. W. HILL ON THE LOWEE BEDS OE THE UrPEE 



understood. It contains, however, valuable information. Mr. Meyer* 

 has also contributed a short paper on the Eed Chalk of Speeton. 



Er. C. Barrois f visited Yorkshire in 1875, but he states that his 

 time was limited. He describes very briefly the interior of the 

 county, but speaks at greater length of the section at Speeton. 

 He correlates the lower beds of the Upper Cretaceous series with 

 those of the South of England; but the absence of information 

 concerning the changes which these beds undergo as they are 

 followed north from Cambridge, and the misconception (since 

 corrected) which he formed as to the position of the Totternhoe 

 Stone, appear to have affected his judgment as to the thickness 

 and sequence of these beds both at Hunstanton and in Lincolnshire 

 and Yorkshire. He appears, however, to acquiesce in the greater 

 extension of the zone of HoJaster subglohosus at Speeton in his 

 criticisms % on the paper by Prof. J. F. Blake. 



Prof. J. P. Blake § has contributed a valuable paper in which he 

 describes the whole of the Chalk of Yorkshire. He correlates it 

 with the divisions of the South of England in a general way and 

 discusses the classification of it as adopted by Dr. Barrois, for whose 

 criticisms thereon see note J. Much information on the Lower 

 Chalk of Yorkshire is given in three small Memoirs of the Geological 

 Survey ||, but the correlation of it with that of Lincolnshire is not 

 attempted. 



A detailed description of the lower part of the Speeton cliffs may 

 be found in Phillips's ' Geology of Yorkshire.' The measurements 

 given differ but slightly from my own, but no two observers seem 

 to agree exactly in the amount of coloured and uncoloured Chalk 

 seen here. This may be the result of taking colour-lines as the 

 basis of measurement ; they will be shown in the sequel to be un- 

 trustworthy guides. 



I must thank Mr. Jukes-Browne for his cooperation in the 

 correlation of the Norfolk and Lincolnshire series, and for giving me 

 the benefit of his knowledge of the latter county, thereby saving me 

 much time and labour in the field, and also for the description 

 appended of a new species of Holaster. 



And I am also much indebted to Mr. C. Pox-Strangways, who 

 gave me every assistance in the investigation of the Lower Chalk of 

 Yorkshire, and to Mr. Goodchild for the accompanying sketch map 

 (%• !)• 



§ I. Llls^COLlS^SHIEE. 



StratigrapTiy . 

 Prom the results of recent work in Suffolk and Norfolk % it 



* Geol. Mag. vol. vi, p 169. 



t C. Barrois, " Recherches sur le terrain Cretace Superieur de I'Augleterre et 

 de rirlande," Mem. Soc. Geol. du Nord, vol. i. p. 191. 



\ Proc. Geol, Assoc, vol, vi, p. 165, 



§ Prof. J, F. Blake, " On the Chalk of Yorkshire," Proc, Geol, Assoc, vol. v. 

 p, 232. 



II Geol, of York and Hull, Geol, of Driffield, Geol. of "Scarboro' : Mems, 

 Geol, Survey. «j Q, J, G. S. vol. xliii. p. 544. 



