Identifier: wiltshirearchaeo2518godd (find matches)
Title: The Wiltshire archaeological and natural history magazine
Year: 1890 (1890s)
Authors: Goddard, Edward Hungerford, 1854- Wiltshire Archaeological and Natural History Society Wiltshire Archaeological and Natural History Society. Proceedings
Subjects: Natural history
Publisher: (Devizes, Eng. : The Society)
Contributing Library: Allen County Public Library Genealogy Center
Digitizing Sponsor: Internet Archive

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to form the second part. Professor Huxley once gave a lecture on a piece of Chalk, andfound a great deal to say about it, both as to the peculiar structureof the material and as to the manner in which it was made. Somepeople may imagine they know all about Chalk when they knowthat it is composed of carbonate of lime, but the microscope tells usthat there are as many different kinds of Chalk as there are differentkinds of Clay or Sandstone ; it shows us also that the number of tinyfossils and organic remains in a crumb of Chalk is as large as thenumber of live animals in a drop of pond-water. Some of you mayhave seen the magnified reflection o£ such a drop of water thrown ona screen by means of the oxyhydrogen lantern, and will rememberthe lively scene it exhibited. In some pieces of Chalk the remainsof minute animals are nearly as numerous, but before entering on \* The Society is indebted to Mr. Jukes-Brownes kindness for two-thirdsof the cost of the illustrations of his paper. z 2
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By A. J. Juices-Browne, B.A., F.G.S. 319 an explanation of these I must direct attention to the sections.Section 1 shows the natural order of the strata which lie beneathDevizes. Beds of rock are not generally vertical masses, but layersor courses which run one under another, and are continuous, hori-zontally or obliquely, for a great distance underground. Thusbed a in the diagram, which u called the Kimeridge Clay, andcomes to the surface between Seend and Poulshot, would be foundunder Devizes if anyone made a boring down to the level at whichit occurs, and a geologist can generally estimate the depth at whichany such bed can be found. The other section before you is one through Morgans Hill, andshows the successive beds of Chalk of which it is composed, thelowest of them resting on the same bed of green Sand which comesto the surface round Devizes and Bishops Cannings. The rocks in the immediate neighbourhood of Devizes belong tothe Cretaceous System, and for the purposes of descrip

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