184 MR. G. W. LAMPLTTGH ON THE SPEETON SEEIES [May l8o,6 r 



of the life-provinces of the period and the climatic conditions and 

 changes. 



The list of the cephalopoda of Speeton as determined by Pavlow 

 has not hitherto been printed in this country, and is therefore 

 given in the Table facing this page. One or two species whose exact 

 position in the series has been ascertained since 1892 are herein 

 for the first time relegated to their proper zones. 



Here I beg leave to thank Prof. A. Pavlow and Messrs. E. T. 

 Newton, E.K.S., and G. C. Crick for their invaluable aid and advice 

 in regard to the palaeontology, and Mr. J". W. Stather, for his 

 kindly assistance in various ways in the field, and for the loan of 

 his specimens. 



III. Inland Extension of the Speeton Series in Yorkshire. 



The available evidence respecting the inland prolongation of the^ 

 Speeton clays is very restricted and unsatisfactory. 



Prof. Judd * mentions their reappearance about a mile dis- 

 tant from the coast in a stream-course near Eeighton ; but this 

 exposure seems to have been at all times very obscure, and it is 

 now no longer recognizable. 



I am informed that clay like that of Speeton was reached in a 

 well sunk a few years ago near Hunmanby Station, 2 miles from 

 the coast ; but I could not learn that any fossils were obtained, and 

 there is consequently no means of determining the horizon. 



Farther westward the solid rocks at the foot of the steep escarp- 

 ment of the Chalk are completely hidden by the drift and alluvium 

 of the Yale of Pickering for about 12 miles ; but after this in- 

 terval the steady rise of the base of the Chalk brings the under- 

 lying clays above the valley-flat ; and there were at one time some 

 small pits in these clays, near the foot of the slope, in the vicinity 

 of the village of Knapton, from which many fossils were obtained.- 

 The excavations, however, have been discontinued for half a cen- 

 tury, and the sections are now entirely obliterated. A few fossils 

 obtained many years ago from these old pits have been preserved 

 in our public museums, and these furnish certain valuable though 

 scanty indications with regard to the horizon of the deposits. 

 Prof. Judd has supposed 2 that only the lowest members of the 

 Speeton Series are present in this area, and that the * Middle ' and* 

 ' Upper ' of his divisions of the coast-section have been cut out by 

 the unconformable overlap of the Chalk. Put I have elsewhere 

 shown 3 that while the fossils above mentioned indicate the almost 



1 ' Additional Observations on the Neocomian Strata of Yorkshire and- 

 Lincolnshire,' Quart. Journ. Geol. Soc. vol. xxvi. (1870) p. 327. The clay in 

 question is referred in this paper to the ' Zone of Ammonites speetonensis ' ; but as 

 Belemnites lateralis is recorded, which species does not occur in the speeton ensis- 

 beds, while there is no mention of the occurrence of the characteristic Belem- 

 nites jaculum, I think that the correlation can scarcely be regarded as- 

 established. 



2 Ibid. p. 329. 



3 ' The Neocomian Clay at Knapton,' The Naturalist (Leeds), Nov, 1890.- 



