The Natural History of Clay

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When used alone, gault burns to a reddish colour, due to the iron present, but if, as is more usual, it is mixed with chalk, it burns perfectly white. Some gaults contain sufficient chalk to render the addition of a further quantity unnecessary.
62 THE NATURAL HISTORY OF CLAY [CH.
Agriculturally, the Cretaceous clays form good arable soil where they are not too exposed, but they suffer from drought.
The ' Wealden clay ' is a stiff yellowish grey or blue clay extensively used for brickmaking in
...Kent, Sussex and Surrey. It has been subdivided by geologists into a number of other clays, such as the Wadhurst, Fairlight, etc. , but the differences between them lie more in the fossils occurring in them than in the characters of the clays themselves. They are usually contaminated with ironstone, gypsum and some limestone.
Agriculturally, the Wealden clay produces stiff, yellowish soils of a wet and poor character, but sometimes loams of a highly productive nature occur.
The Tertiary clays include all those deposited after the Chalk and previous to the close of the Glacial period.


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