This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...surface-products may never have been formed (Fig. 122). Gradation towards Volcanic Rocks.--But if these rocks are really the roots of volcanoes, we ought to find eveiy F1g. I2z.--Dyke of gra-1ite, Brazil Wood, Leicestershire. G = granite; S = metamorphosed shales. transition from them to the volcanic rocks. This is, in ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...surface-products may never have been formed (Fig. 122). Gradation towards Volcanic Rocks.--But if these rocks are really the roots of volcanoes, we ought to find eveiy F1g. I2z.--Dyke of gra-1ite, Brazil Wood, Leicestershire. G = granite; S = metamorphosed shales. transition from them to the volcanic rocks. This is, in fact, the case, for granites themselves vary in grain from coarse to fine, and from porphyritic to very compact types. They give off dykes and the more irregular protrusions called veins, which, as they are traced nearer the surface and away from the main granite-mass, become finer in grain and sometimes take on a stony texture (Fig. 123). At times their edges and ends are even glassy or vesicular, and thus the transition from granite through dyke-rocks to volcanic rocks is quite complete and gradual. A mass of intrusive rock may shrink in cooling, and parts of the uncooled magma may be intruded into that which has been already solidified. Thus veins will be formed which may have a slightly different composition from that of the part first soldified. Granite in chemical and mineralogical composit1on--N felspar, quartz, and sometimes hornblende--corresponds with the lava-rock rhyolite; but there are also rocks corresponding to the other volcanic products. The whole group is called Plutonic,1 from the circumstance of its deep-seated origin. F1g. 123.--Veins of granite (G) piercing slates (S) of Tremadoc age, and enclosing patches of them; Tan-y-Grisiau, Carnarvonshire. (From a photograph by Mr. Griffith Williams: copyright.) Thus there are acid, intermediate, and basic plutonic rocks which correspond, species for species, with the volcanic rocks, and the table on page 168 may be extended as follows: --Class1f1cat1on Of Igneous Rocks Dykes, Sills..
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Add this copy of Geology for Beginners to cart. $15.75, good condition, Sold by John C. Newland rated 4.0 out of 5 stars, ships from Cheltenham, Glos., UNITED KINGDOM, published 1935 by Macmillan.
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Used-Good. Good hardback (no dust jacket) 6th edition, reprinted with corrections, 1942. Scarlet cloth with black lettering; B&W & line illustrations. Owner's inscription on front pastedown; page fore-edge lightly foxed; cloth on spine faded, with wear at head & foot.
Add this copy of Geology for Beginners to cart. $19.85, poor condition, Sold by Anybook rated 4.0 out of 5 stars, ships from Lincoln, UNITED KINGDOM, published 1920 by Macmillan.
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This is an ex-library book and may have the usual library/used-book markings inside. This book has hardback covers. In poor condition, suitable as a reading copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item, 500grams, ISBN:
Add this copy of Geology for Beginners to cart. $21.42, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
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Fine. Sewn binding. Cloth over boards. 382 p. Intended for a juvenile audience. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.