. The Quarterly journal of the Geological Society of London. a b c d e a—c. Helix incamata. d, e. Helix ruderata (magnified). Overlying the white marl is an unstratified deposit of reddish-brown clay (No. 1 of the section), containing chalk-nodules, roundedand angular flints, boulders of greywether and other sandstones,limestones, conglomerates, and porphyritic rocks. This clay is from1 to 6 feet thick ; the greatest thickness occurring in the northernpart of the field. To the south it passes over the limit of the marl-beds, and rests on the yellow bed into which the blue clay or brick-earth p
. The Quarterly journal of the Geological Society of London. a b c d e a—c. Helix incamata. d, e. Helix ruderata (magnified). Overlying the white marl is an unstratified deposit of reddish-brown clay (No. 1 of the section), containing chalk-nodules, roundedand angular flints, boulders of greywether and other sandstones,limestones, conglomerates, and porphyritic rocks. This clay is from1 to 6 feet thick ; the greatest thickness occurring in the northernpart of the field. To the south it passes over the limit of the marl-beds, and rests on the yellow bed into which the blue clay or brick-earth passes. No organic remains have been found in this brownclay, excepting a molar tooth of a Horse, and this was obtained nearits junction with the white marl. At the western and northern parts of the field there is a superficialbed of peat, about 1 foot in thickness, with recent land and fresh-water shells, many of which retain their epidermis. 1852.] BROWN UPPER TERTIARIES AT COPFORD. 191 Ha^dng thus described the Copford deposits in detail, I wouldobserv
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
