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A Treatise on Geology, the Article Under That Head in the 7th Ed. of the Encyclopędia Britannica
A Treatise on Geology the Article Under That Head in the 7th Ed of the Encyclopdia Britannica Author:John Phillips General Books publication date: 2009 Original publication date: 1837 Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million book... more »s for free. Excerpt: Diagram, No. 1. Formation Group Of Bed without lamina?. Bed with waved laminae. Finely laminated rock. densely laminated. stbata- - Obliquely laminated. With parallel lamlnee. Obliquely laminated. SCALE OF STRATA IN OTHER COUNTRIES. The series of strata classed in the preceding table is always recognisable, wholly or partially, in every part of the British islands; that is to say, the stratified rocks occurring in any situation can be referred to their respective types in the general table. But the local variations are considerable ; several of the stratified rocks are only of limited extent; even whole formations, as the oolitic formation, change their characters, or, as the millstone grit, are entirely extinct in particular regions where the groups above and-below them are complete. This being the case, it is evident that such subdivisjons are too minute and variable to be employed in comparisons between British and foreign series of strata. We must be satisfied with comparing formations and systems, and in some cases omit even these and look only to the succession of primary, secondary, and tertiary classes of rocks. This examination has been made in almost all parts of the world, nowhere, indeed, except in Europe and certain portions of the other continents completely, yet everywhere sufficiently to establish the truth of the following propositions. 1. The series of British strata represents very well the succession of stratified rocks in Europe, parts of Africa, Asia, and North America; this agreement is most strictin those parts which are nearest to the British islands, and ...« less