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Inhaltsangabe
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. 1865 Excerpt: ...next division of my subject is the limestones themselves. If we take them as a group, we find that they are deposited in every great formation. They occur in the lower silurian rocks in great quantities, mixed up with alumina. Rising upwards we find in the carboniferous system, in the oolites, and in the cretaceous strata, the same results, in each and all carbonate of lime is abundant. Hardly a street can be traversed or a room entered without finding signs of organic remains formed of this substance. In the chimney-piece before you is a collection of fossils, where every white mark gives a section of a curve, that curve affording some indication of a fossil. This specimen that I hold in my hand is a piece of common limestone that I picked up at Bristol, containing a fossil; it is a stem of an encrinite, which has become disjointed and broken at one point, and forced out of the line of continuity--thus offering three different sections. The limestone containing the encrinite is so common that it is used as a road-material in the neighbourhood of Bristol. On searching many of the old walls in a limestone district, you will often find that the weathered SECTION OP A PORTION OF THE STEM OF AN ENCRINITE, FROM THE MOUNTAINLIMESTONE. surface will exhibit different portions of such columns of joints or ossicles; these become disjointed, and they are often threaded and worn as beads--" St. Cuthbert's Beads," as they are termed. Whenever limestone comes in contact with the igneous rocks, it puts on a crystalline appearance, as in the case of the delicate statuary marble, which is nothing more than limestone affected by heat. Beautiful exampies of this change are to be seen in the north of Ireland, near the Giant's Causeway, where the chalk is converted in...
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Reseña del editor
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. 1865 Excerpt: ...next division of my subject is the limestones themselves. If we take them as a group, we find that they are deposited in every great formation. They occur in the lower silurian rocks in great quantities, mixed up with alumina. Rising upwards we find in the carboniferous system, in the oolites, and in the cretaceous strata, the same results, in each and all carbonate of lime is abundant. Hardly a street can be traversed or a room entered without finding signs of organic remains formed of this substance. In the chimney-piece before you is a collection of fossils, where every white mark gives a section of a curve, that curve affording some indication of a fossil. This specimen that I hold in my hand is a piece of common limestone that I picked up at Bristol, containing a fossil; it is a stem of an encrinite, which has become disjointed and broken at one point, and forced out of the line of continuity--thus offering three different sections. The limestone containing the encrinite is so common that it is used as a road-material in the neighbourhood of Bristol. On searching many of the old walls in a limestone district, you will often find that the weathered SECTION OP A PORTION OF THE STEM OF AN ENCRINITE, FROM THE MOUNTAINLIMESTONE. surface will exhibit different portions of such columns of joints or ossicles; these become disjointed, and they are often threaded and worn as beads--" St. Cuthbert's Beads," as they are termed. Whenever limestone comes in contact with the igneous rocks, it puts on a crystalline appearance, as in the case of the delicate statuary marble, which is nothing more than limestone affected by heat. Beautiful exampies of this change are to be seen in the north of Ireland, near the Giant's Causeway, where the chalk is converted in...
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- VerlagRareBooksClub.com
- Erscheinungsdatum2012
- ISBN 10 123102285X
- ISBN 13 9781231022856
- EinbandTapa blanda
- SpracheEnglisch
- Anzahl der Seiten150
- Kontakt zum HerstellerNicht verfügbar
(Keine Angebote verfügbar)
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