XX.—On the Strata observed in boring at Mildenhall in Suffolk: extracted from a Letter addressed to W. Somerville, M.D. M.G.S.
1824; Geological Society of London; Volume: 1; Issue: 2 Linguagem: Inglês
10.1144/transgslb.1.2.379
ISSN2058-1041
Autores Tópico(s)Geological Formations and Processes Exploration
ResumoDear Sir, As the Geological Society may wish to be informed of every circumstance that tends to verify the stratification in different parts of England, I send you an account of what has been observed in this parish on piercing with a boring machine to the depth of 270 feet. I will first give a short description of the country where the trial was made. A part of the large parish of Mildenhall is fen-land, and belongs to the great Bedford Level. The substrata of the fens are not well ascertained; but I am inclined to believe that the blue clay, provincially termed gault, will be found in most places to lie beneath the peat. The remainder of the parish is upland, and has every where a substratum of chalk, which shows itself here and there even amid the fens. This chalk belongs to the range of that rock which passes from Cambridgeshire across this western part of Suffolk into Norfolk. The chalk contains no layers of flints, though covered by loose flints on its surface. It is generally hard enough to serve for a building-stone, if suffered to remain exposed for some months after being dug to the action of the air and frost. The surface soil varies very much; a large portion of it consists of a thin but rich sandy loam, while a more extensive tract is buried beneath a blowing sand. In hollows on the surface of the chalk-rock we often find deposits of blue clay
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