. The Quarterly journal of the Geological Society of London. of depression in Cambridgeshire, and whosecommencement might date from changes that took place at the end known, covered by 100 to 200 feet of tertiary strata. From Croydon and Epsom,towards Merstham and Dorking, there is evidence indicating that the chalk is pro-bably not more than 400 to 500 feet thick, whilst on the summit of the NorthDowns overlooking Godstone, Reigate, and Dorking there are outliers of the lowertertiary beds, which reach to the very edge of the escarpment overlooking thegreensand district; and from raeasm*ement
. The Quarterly journal of the Geological Society of London. of depression in Cambridgeshire, and whosecommencement might date from changes that took place at the end known, covered by 100 to 200 feet of tertiary strata. From Croydon and Epsom,towards Merstham and Dorking, there is evidence indicating that the chalk is pro-bably not more than 400 to 500 feet thick, whilst on the summit of the NorthDowns overlooking Godstone, Reigate, and Dorking there are outliers of the lowertertiary beds, which reach to the very edge of the escarpment overlooking thegreensand district; and from raeasm*ement of the chalk between the upper green-sand and the base of these tertiaries, I find that at Dorking and Reigate the chalkis not above 400 to 450 feet tliick, whilst above Godstone it does not exceed athickness of 2»^^ feet. 258 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 21. Fig. 7.—Diagram showing the conditions that would have resultedfrom the deposition of the Cretaceous Beds on the edge of a shoalformed by the previous elevation of the Weald. N. Elevated mass of the beds. 1 & 2. Lower Cretaceous strata, thinning out to the south,whilst the Upper strata overlap successivelyupon the Wealden rocks. Fig. 8.—Diagram showing the relative thickness of the Lower Creta-ceous beds, and the denudation of the Chalk, over the Weald. N. Shoal or Island S. in the Tertiary Sea.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
