. The geology of Holderness, and the adjoining parts of Yorkshire and Lincolnshire. the same thing, following the 100-footcontour line, the next exposure is at Nafferton. Here, imme-diately below the 100-foot line, there is Marine Gravel, withfragments of Cardium edule, Mya, sp., Mytilus edulis, and Tellinabalthica, overlying thin Boiilder Clay, and containing abundanceof derived Boulder Clay stones. This rests on the shelvingsurface of the Chalk. South of Naiferton no Marine Gravelshave yet been observed west of the river Hull, and the storedeposits of the old bay would appear to have been en
. The geology of Holderness, and the adjoining parts of Yorkshire and Lincolnshire. the same thing, following the 100-footcontour line, the next exposure is at Nafferton. Here, imme-diately below the 100-foot line, there is Marine Gravel, withfragments of Cardium edule, Mya, sp., Mytilus edulis, and Tellinabalthica, overlying thin Boiilder Clay, and containing abundanceof derived Boulder Clay stones. This rests on the shelvingsurface of the Chalk. South of Naiferton no Marine Gravelshave yet been observed west of the river Hull, and the storedeposits of the old bay would appear to have been entirelydenuded from the slope of the Wolds. North-east of the Hull, commencing near Little Kelk, theGravel forms a series of ridges 20 or 30 feet iiigh, resting on andpartly overlaid by purple. Boulder Clay. The best exposures areseen between Brunton Hill Wood and Barf Hill, a pit at thelatter place exhibiting the section sketched by Mr. Dakyns(Fig. 6). This exposure is important, as showing that the Marine Pig. 6.—Barf Hill.—Inter-glacial Gravels overlaid hy Boulder ^mrn^ Gravel is beneath a bed of Boulder Clay. Boulder Clay is seenin the upper part of the pit, and the structure and shape of theground appear to show that another Boulder Clay also passesbeneath the ridge. In this pit, and in another about half a milefurther north, the following species of Mollusca were found, all ofthera being forms already known from Kelsey Hill:— Ostrea edulis Pholas crispata. Astarte borealis. Tellina balthica. Cardium edule. Venus ? gallina ? Cyprina islandica. Dentalium entalis ? Mactra ovalis. Buccinum undatum. Mya trvncata ? Purpura lapillus. Ostrea edulis. Balanus, sp. These Gravels continue in the same line for some distance tothe south, but the ground being lower there are no open Brigham, and Church End, Nortlf Frodingham, two more MARINE GRAVELS. 53 mounds of gravel, about the same height as those just described,are seen. These have yielded a few fragments of
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectgeology, bookyear1885
