146 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



3. On the Glacial and Postglacial Steuctfre of Lin-colj^-shire and 



South-east Yorkshire. By Searles Y. Wood, Jan., Esq., F.G.S., 



and the Rev. J. L. Rome, E.G.S. 



(Eead November 20, 1867*.) 

 I. Introdxtctiox. 

 The geology of the Upper Tertiaries in Lincolnshire has not, so far 

 as we are aware, received any general notice ; while in the case of 

 Yorkshire, the accounts given belong for the most part to a date when 

 the views of geologists on the subject were very restricted. 



The work of Dr. Young and Mr. Bird upon the geology of the 

 Yorkshire coast was pubHshed in 1822, while the more recent and 

 better-known work, the ' Geology of Yorkshire,' by Prof. Phillips, 

 has now been published thirty-eight years. Even the latter of these 

 works long precedes the time when geologists began to recognize the 

 importance of the Drift-series, or the former existence in these lati- 

 tudes of the arctic and subarctic conditions to which they were due. 



These works, and a notice by Mr. Prestwich of the occurrence of 

 Cyrena jluminalis at Kelsea Hill, in the 17th vol. of the Journal of 

 the Society, a paper by Mr. Topley " On the physical Geology of 

 East Yorkshire," in the 3rd volume of the ' Geological Magazine,' 

 p. 435, and a notice of the submerged forest at the Hull Docks, by 

 Mr. F. M. Poster, in the ' British Association Report ' for 1866, 

 constitute the only pubhshed accounts of the Tertiary geology of 

 this region, so far as we are aware, up to the year 1866. In that 

 year, and while our investigations were in progress, Mr. H. P. HaU, 

 P.G.S., visited Holderness ; and, the results of these investigations up 

 to that time being communicated to him, especially the distinction 

 between the three Boulder-clays of that district and their unconfor- 

 mabihty, he has, in a paper read before the Liverpool Geological 

 Society, and lately published in their 'Proceedings,' given a description 

 of some of the features of the Holderness coast. The paper, not 

 being illustrated by sections, cannot be easily followed by those not 

 thoroughly familiar with the district ; but, with the exception of the 

 distinction between these three clays, the views of Mr. Hall are at 

 variance for the most part with what appears to us to have been the 

 sequence of geological events in this region. 



In his paper on the Lincolnshire Oolites, in the 9th vol. of the 

 Journal, Prof. Morris has given an accurate account of the patch of 

 Glacial clay intersected by the Great Northern Railway at Ponton. 



In the able paper by Mr. Judd, " On the Strata which form the 

 Base of the Lincolnshire Wolds," in the last volume of the Journal, a 

 sHght reference is made, under the term "peculiar drift," to the 

 Glacial clay which has so magnificent a development in that county. 



As the two counties, although containing in common the great 

 natural feature of the "Wolds," which has an intimate connexion 

 with the Glacial and Postglacial structure of the region, yet possess 

 some very distinctive features, it will be convenient in the first place 

 to describe them separately, the north-east of LincoLnshire connect- 

 ing itself with Yorkshire, and having the same distinctive features 

 from central and south Lincolnshire. 



* For the other communications read at this Evening-meeting, see p. 2. 



