218 MR. G. W. LAMPLUGH ON THE SPEETON SEKIES [May 1 896, 



3. The ferruginous sands which occur locally beneath the Eed Chalk 



on the western edge of the Yorkshire Wolds are recognized as 

 agreeing in all respects with the Lincolnshire Carstone, and 

 where absent are to some extent represented by a pebbly base 

 to the Eed Chalk, as in Lincolnshire. In both counties Mr. A. 

 Strahan's conclusions as to the relations of the Carstone to the 

 Eed Chalk are confirmed. 



4. In Mid-Lincolnshire all the palseontological zones of the Speeton 



Series are identified and traced ; and though their lithological 

 aspect is greatly modified, and is accompanied by a corre- 

 sponding modification of their fauna, the presence of the 

 leading zonal types of the cephalopoda readily establishes the 

 general correlation proposed by Prof. Pavlow and the author, 

 which differs in many respects from that adopted by Previous 

 investigators. 



5. In Lincolnshire, in at least one instance, the synchronal boundary, 



as indicated by the limits of a palseontological zone, is shown 

 not to pursue the same stratigraphical horizon throughout its 

 course, proving that sediments of different character were accu- 

 mulated simultaneously in comparative proximity to each other. 

 The inherent divergence between the stratigraphical and pahe- 

 ontological methods in geology is thus once more illustrated. 



6. The derivative character of the band of phosphatic nodules at 



the base of the Spilsby Sandstone is stated to be very doubtful ; 

 and the fossils of these so-called 'pebbles/ as of the corresponding 

 horizon at Speeton, are considered as probably representing an 

 original fauna, poorly preserved in nodules formed during a 

 temporary pause in the sedimentation. 



7. It is shown that the 'Zone of Belemnites lateralis' bridges 



over the space between undoubtedly Jurassic and undoubtedly 

 Lower Cretaceous strata ; but if the accepted classification of 

 other areas is to be upheld, it appears to be necessary that the 

 division between the systems should be placed high enough to 

 include this zone, or at least the greater part of it, in the 

 Jurassic, in spite of the local inconvenience of this arrangement. 



Discussion. 



The President said that it was hardly possible, when mapping in 

 the field, to do more than follow those petrological changes in the 

 character of beds over any given area which are patent to the 

 observer. The point discussed by the Author is that the life-line 

 does not follow the line of the same sedimentation, but life-forms 

 may transgress, and do transgress, over sediments of different cha- 

 racter when they happen to be accumulated at the same time. It 

 is hoped, however, that the case propounded by the Author is 

 exceptional, and that, as a rule, the sediments and the fossils 

 follow one another on the same lines. 



Prof. Judd congratulated the Society upon the valuable details 

 now communicated by the Author, and on the important work on 



