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Philadelphia Academy of Natura Sciences:
Proceedings of the Academy of Natural Sciences of Philadelphia, 1882 (Classic Reprint) - PaperbackISBN: 1333116071
Paperback, [EAN: 9781333116071], Forgotten Books, Forgotten Books, Book, [PU: Forgotten Books], Forgotten Books, Excerpt from Proceedings of the Academy of Natural Sciences of Philadelphi… More...
Proceedings of the Academy of Natural Sciences of Philadelphia, 1882 (Classic Reprint) (Paperback) - Paperback
2018
ISBN: 1333116071
[EAN: 9781333116071], New book, [PU: Forgotten Books, United States], Language: English. Brand new Book. Excerpt from Proceedings of the Academy of Natural Sciences of Philadelphia, 1882 … More...
ISBN: 9781333116071
Proceedings of the Academy of Natural Sciences of Philadelphia, 1882 (Classic Reprint) Philadelphia Academy of Natura Sciences, Books, Science and Nature, Proceedings of the Academy of Na… More...
2017, ISBN: 1333116071
[EAN: 9781333116071], Neubuch, [PU: Forgotten Books], This item is printed on demand for shipment within 3 working days.
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Other pebbles of milky, smoky, and other quartz appear to have been derived from quartz veins of our neighboring gneiss rocks.
Black pebbles found in the gravel used in the construction of the bed of the junction railroad just north of the city, and collected as specimens of basanite or touchstone, appear to be hornstone or chert, like that in the lower Silurian limestone at Easton. Numerous pebbles of the same kind are found on the Delaware shore at the latter place. Limestone itself appears to form no conspicuous element of our gravels. Though abundant in the same sources of supply of the common ingredients of the gravels, its fragments have been completely dissolved away Occasionally he had seen in the interior of a freshly broken pebble of black hornsto'ne, such as one presented this evening, minute rhombohedrons of calcite, while on the exterior minute cavities of the same form show where similar crystals have been dissolved.
Pebbles of red sandstones and shales are frequent elements of our gravel, and have evidently been derived from the triassic rocks, so abundantly exhibited north of the city. Pebbles of compact quartz conglomerate are less frequent, and may probably have been derived from the same source. Or perhaps from the coal measures farther north.
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Details of the book - Proceedings of the Academy of Natural Sciences of Philadelphia, 1882 (Classic Reprint)
EAN (ISBN-13): 9781333116071
ISBN (ISBN-10): 1333116071
Paperback
Publishing year: 2017
Publisher: FB&C Ltd
Book in our database since 2017-07-06T20:17:48+01:00 (London)
Detail page last modified on 2019-04-26T16:01:52+01:00 (London)
ISBN/EAN: 9781333116071
ISBN - alternate spelling:
1-333-11607-1, 978-1-333-11607-1
Alternate spelling and related search-keywords:
Book author: philadelphia
Book title: philadelphia, proceedings the academy natural
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