Abstract
I am not aware that the sand of Bagshot Heath has yet been described with such attention to detail, and reference to localities, as will enable an inquirer to form a correct opinion concerning its geological character. Mr. Smith indeed is stated, in Mr. Farey’s Survey of Derbyshire, to have ascertained that it is the highest known stratum in England, and that it rests upon the clay of London; but no proofs of this statement are there given, and I do not find a repetition of it in the memoir that accompanies Mr. Smith’s geological map; nor is the map coloured in conformity with this opinion. Concerning the Bagshot sand it may be asked, whether, like the gravel about London, it consists of diluvian debris, or whether it belongs to a regular stratum, like the sands of the plastic clay? and admitting it to belong to a regular stratum, it will be a question to what position we shall refer it among the beds superior to the chalk. The sand of Bagshot Heath occupies a district extending from east to west, along the axis of that great depression in the chalk which has been called the London Basin. The length of this district, from its eastern extremity at Esher in the county of Surry to its western extremity at Bromshill Common on the confines of Berkshire and Hampshire, is about twenty-five miles. From Hungry Hill near Farnham to Oakingham, where its breadth from south to north is the greatest, the
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