The Quarterly journal of the Geological Society of London . marl and calcareous tufa, aboundingwith land shells of existing species, are developed beneath the warp-drift. These calcareous deposits extend for about 300 yards fromthe base of Headon Hill. Near the termination there is thesection which is given on the opposite page. The warp-drift which covers these calcareous deposits consists of abrown sandy loam, more tenacious towards the lower part, with notraces of lamination, and containing fragments of flint and of the * It must be borne in mind tbat this paper has been locked up sinc
The Quarterly journal of the Geological Society of London . marl and calcareous tufa, aboundingwith land shells of existing species, are developed beneath the warp-drift. These calcareous deposits extend for about 300 yards fromthe base of Headon Hill. Near the termination there is thesection which is given on the opposite page. The warp-drift which covers these calcareous deposits consists of abrown sandy loam, more tenacious towards the lower part, with notraces of lamination, and containing fragments of flint and of the * It must be borne in mind tbat this paper has been locked up since the begin-ning of 1848 in the archives of the Government Geological Survey. In recentcommunications to the Society, I have been able to speak more confidently of theage of this gravel: see Table, Quart. Journ. Geol. Soc. vol. ix. p. 295. 1853.] TRIMMER—SUPERFICIAL DEPOSITS, ISLE OF WIGHT. 53 freshwater limestone, which must have required considerable force ofwater for their transportation. Section of the Superficial Calcareous Deposits, Tollands Eocene Sands. a, Calcareous tufa—land-shells : 10 inches to 2 feet. I, Sand blackened by organic matter—calcareous concretions and land-shells :4 to 12 inches. c, Cream-coloured marl, with calcareous concretions, and a few thin black seams coloured by vegetable matter—land-shells : 2 feet 6 inches. d, Warp-drift of brown loam: 5 feet. Further to the the warp-drift appears under its usual cha-racter, often gravelly towards the base, and with no calcareous bedsbelow it, but filling indentations and furrows in the bed on whichit rests, whether that be flint-gravel or one of the eocene strata. Onthe it only appears at intervals, being partially concealed bythe debris of the upper part of the cliff or by vegetation. At thebase of Headon Hill it is well exposed, and accessible for examina-tion for about thirty yards along the face of the cliff, while a gullyhas laid open a transverse section for about fifty yards in
Size: 2352px × 1062px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
