Yd. 52.] SPEETON SERIES IN YORKSHIRE AND LINCOLNSHIRE. 179 



8. On the Speeton Series in Yorkshire and Lincolnshire. By 

 G. W. Lampltjgh, Esq., F.G.S., of H.M. Geological Survey. 

 (Bead January 22nd, 1896.) 



Contents. 



Page 



I. Introduction 179 



II. Further Notes on the Speeton Section 180 



III. Inland Extension of the Speeton Series in Yorkshire 184 



IV. The Speeton Series in Lincolnshire. 



a. General Observations and Bibliography 191 



b. The Kimeridge Clay 193 



c. The Basement-bed of the Spilsby Sandstone 195 



d. The Spilsby Sandstone 199 



e. The Olaxby Ironstone 200 



f. The Tealby Clay 207 



g. TheTealby Limestone (with the Upper Clay and ' Roach') 209 

 h. The Carstone 211 



V. Statement of the Correlation 212 



YI. The Age of the Belemnites lateralis Beds 213 



VII. Concluding Summary 217 



Sketch-map of the Yorkshire and Lincolnshire Wolds 187 



Tables facing 184, 192, 212 



I. Introduction. 



In describing the clays which underlie the Chalk at Speeton on the 

 Yorkshire coast in a paper communicated to this Society in 1889, 1 I 

 attempted to show the necessity for a fresh classification of these 

 deposits. Further investigation of this section has fully confirmed 

 the views then advanced. It has also indicated the desirability of 

 a corresponding revision of the inland exposures of the rocks of the 

 same age in Yorkshire and Lincolnshire, since it is only by means 

 of the knowledge of the full sequence to be acquired on the coast- 

 section that the true relationship of the limited and isolated ex- 

 posures of the interior can be unravelled. 



Using such opportunities as have at intervals occurred, I have 

 therefore more or less closely examined the base of the Chalk 

 escarpment throughout its whole length in Yorkshire and Lincoln- 

 shire, and desire in this paper to put on record the result of my 

 investigation. It will be shown that the divisions proposed for the 

 Speeton section are readily applicable to the inland exposures, and 

 indeed afford the most convenient and natural means of palae- 

 ontological classification, albeit some modification of the systems 

 usually applied is thereby required. 



It may be well at once to state that, while my chief aim will be 

 to establish the correlation of the deposits by means of their palae- 

 ontology, no attempt will, for the present, be made to carry the 

 palaeontological research further than is necessary for this purpose. 

 Hence the fossils dealt with herein will only partially represent 



1 'On the Subdivisions of the Speeton Clay,' Quart. Journ. Geol. Soc. 

 vol. xlv. pp. 575-618. 



Q. J. G. S. No. 206. o 



