156 PEOCEEDI^fGS OF THE GEOLOGICAL SOCIETF. 



of the well-known trout-stream ; and this is the only instance in 

 which we have detected inland these beds so frequent in the coast- 

 section. Doubtless this is due to their feeble development render- 

 ing them difficult of detection when not in section. These Cyclas- 

 marls are not shown in the condensed section Xo. 1, on account of 

 the smaUness of its scale ; but the places of their occurrence are given 

 in the reference to the section. 



All the beds occuiTing inland over south-east Yorkshire and 

 north-east Lincolnshii^e, with the exception of the sands and gravels 

 on the ^old-summit and on the Lincolnshire Oolitic ridge, and also 

 of the marsh or Humber silt-deposits, are, we think, referable to 

 one or other of the beds occurring in the coast-section. These 

 excepted sands and gravels will be more conveniently described in 

 connexion with the denudation-features of the area under considera- 

 tion, to which denudation we regard them as due. In Lincoln- 

 shire, around Ulceby *, are numerous pits of gravel, and some 

 of the Hessle clay, which show the latter resting immediately on the 

 chalk without the intervention of the gravel d. It is probable, 

 therefore, that these ITlceby gravels belong to the series/; but con- 

 sidering how abruptly the Hessle clay overlaps its gravel, there 

 must always remain gi^eat uncertainty in assigning the gravels 

 inland to their true position in the coast-sequence. All the gravels, 

 however, that occur at numerous places along the lower edge of the 

 eastern flank of the Wold, both in Yorkshire and Lincolnshire, 

 belong, we think, either to the beds /and f or to the Hessle gravel d, 

 and most of them to the former. 



On the eastern slope of the "Wold, however, at Kirmington, in 

 north-east Lincolnshire (ten miles south of Hull), and at an eleva- 

 tion (as we estimate) of between 100 and 150 feet above the sea, corre- 

 sponding to the higher limits of the Hessle clay, there occui's a deposit 

 which, unless it belongs to that clay, and forms an estuarine portion 

 of it, as we infer it does, has no place in the coast-section. This 

 deposit consists of a brick-clay interbedded with sands, and capped 

 by a thick bed of large, rounded, or beach-rolled flints. The clay 

 has yielded some homs of a Cervus, and alsojthe estuarine or lit- 

 toral moUusca, ScrolicuJaria lAjperata and Ali/tiJus edidis. Its 

 isolated character (although we believe that it extends into the 

 adjoining parish of Great Limber), coupled with its estuarine fauna, 

 and its occurrence at almost the extreme limit of elevation to which 

 we have been able to trace the Hessle clay, as weU as the apparent 

 continuity which it has horizontally with that clay, conspire to 

 indicate that it is a portion of the Hessle-clay formation. The water 

 prevents any attempt to ascertaiu whether it rests on the chalk or 

 OD the Hessle clay. It is far beyond the limits of that part of the 

 purple clay which the denudation had spared. 



The only other deposit to be noticed in this description of the south- 

 east Yorkshire and north-east Lincolnshii'e beds is that disclosed by 

 the borings and excavations at the docks of Hull and Grimsby. The 



* This is ITlceby in North Lincolnshire; there is another on the Wold, 

 crossed br the section given in fig. 8. 



