Aids to Identification of Geological Formations
Aids to Identification of Geological Formations
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Shale and clay in the Pennsylva- nian and the Permian are quite commonly devoid of a calcareous ingredient. In the Pleistocene de- posits we find both marls and non-calcareous clays.
Fire-clay Fire-clay is free from lime, as a rule. It occurs in beds which were at one time exposed and leached 28 Handbook of Aids to at the surface and later, perhaps, buried under peat which since has changed to lignite or coal. In tex- ture, fire-clay is quite variable, from the finest clay to silty and quite sa...ndy clay. Fire-clays occur es- pecially in coal and lignite-bearing formations, such as the Pennsylvanian, parts of the Eocene Tertiary, and the coal-bearing beds of the Cretaceous on the Rio Grande.
Fuller's Earth Strata of white kaolin-like clay occur in the lower part of the Taylor marl and . At several levels in the early and middle Tertiary. These strata are, for the most part, deposits of volcanic dust, which has been hydrated, and which are known in some cases to be suitable for use as fuller's earth.
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To quickly assess the difficulty of the text, read a short excerpt:
Shale and clay in the Pennsylva- nian and the Permian are quite commonly devoid of a calcareous ingredient. In the Pleistocene de- posits we find both marls and non-calcareous clays.
Fire-clay Fire-clay is free from lime, as a rule. It occurs in beds which were at one time exposed and leached 28 Handbook of Aids to at the surface and later, perhaps, buried under peat which since has changed to lignite or coal. In tex- ture, fire-clay is quite variable, from the finest clay to silty and quite sa...ndy clay. Fire-clays occur es- pecially in coal and lignite-bearing formations, such as the Pennsylvanian, parts of the Eocene Tertiary, and the coal-bearing beds of the Cretaceous on the Rio Grande.
Fuller's Earth Strata of white kaolin-like clay occur in the lower part of the Taylor marl and . At several levels in the early and middle Tertiary. These strata are, for the most part, deposits of volcanic dust, which has been hydrated, and which are known in some cases to be suitable for use as fuller's earth.
What to read after Aids to Identification of Geological Formations?
You can find similar books in the "Read Also" column, or choose other free books by Johan August Udden to read onlineMoreLess
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