. The geology of Holderness, and the adjoining parts of Yorkshire and Lincolnshire. two types may belong merely todifferent stages of the same Inter-glacial Period; but, on the otherhand, one may be considerably older than the other, and separatedfrom it by Boulder Clay. The Hessle Gravels Prof Phillipsconsidered to be Pre-glacial, and much older than the Marine Beds. 48 INTER-GLACIAL BEDS. But, without following him so far,—and the evidence of the fossils isagainst this view,—as a matter of convenience the MammaliferousGravels resting directly on the Chalk will be described first. During the
. The geology of Holderness, and the adjoining parts of Yorkshire and Lincolnshire. two types may belong merely todifferent stages of the same Inter-glacial Period; but, on the otherhand, one may be considerably older than the other, and separatedfrom it by Boulder Clay. The Hessle Gravels Prof Phillipsconsidered to be Pre-glacial, and much older than the Marine Beds. 48 INTER-GLACIAL BEDS. But, without following him so far,—and the evidence of the fossils isagainst this view,—as a matter of convenience the MammaliferousGravels resting directly on the Chalk will be described first. During the spring of 1884 Mr. Mortimer informed me that atlast the sea had cleared away the talus, and exposed a good sectionof the buried cliff near Bridlington. In the early part of MayI had the advantage of his guidance to the exact spot where, notfar from this cliff, he had obtained mammalian bones, Next day,by employing a labourer for a few hours, the very important sec-tion here figured was laid bare. Pis. 4.—Bwied, Cliff nea/rBridlington, andFossiliferousBedsbcmJced The old cliff proved to be perfectly vertical for over 30 feetand^ cuts the present coast line at an obtuse angle. Bankedagainst it is a series of deposits unlike any thing else in about 5 feet above the level of the present beach is shingle,composed almost entirely of Chalk, often bored by Pholas, mixedwith a few of the local grey flints. Though Boulder Clay lies on the cliff almost vertically abovethis beach, yet, with the exception of a single fragment of siliciousironstone of doubtful origin, no foreign boulders could be foundin it. This at once distinguishes the old beach from the recentshingle, for at the present day there is a very large number ofBoulder Clay stones on the shore. MAMMALIFEROUS GRAVELS OF BRIDLINGTON AND HESSLE. 49 Above this beach there is a roughly stratified mixture of marlysand, chalky wash, and fallen angular blocks of Chalk,—ia factjust such a talus as f
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectgeology, bookyear1885
