On Specimens of Eozoon Canadense And Their Geological And Other Relations
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Again, the linguliferous sandstone of the Acadian group is a material which, by metamorphism, might readily afford a pyroxenite with layers or veius of apatite like those which occur in the Laurentian.
The probability of the animal origin of the Laurentian apatite is perhaps further strengthened by the prevalence of animals with phosphatic crusts and skeletons in the Primordial age, giving a presumption that in the still earlier Laurentian a similar preference for phosphatic matter may have exi...sted, and, perhaps, may have extended to still lower forms of life, just as the appropriation in more modern times of phosphate of lime by the higher animals for their bones seems to have been accompanied by a diminution of its use in animals of lower grade.
The Laurentian apatite pretty constantly contains a small percentage of calcium fluoride ; and this salt also occurs in bones, more especially in certain fossil bones. This may in both cases be a chemical accident ; but it supplies an additional coincidence.
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To quickly assess the difficulty of the text, read a short excerpt:
Again, the linguliferous sandstone of the Acadian group is a material which, by metamorphism, might readily afford a pyroxenite with layers or veius of apatite like those which occur in the Laurentian.
The probability of the animal origin of the Laurentian apatite is perhaps further strengthened by the prevalence of animals with phosphatic crusts and skeletons in the Primordial age, giving a presumption that in the still earlier Laurentian a similar preference for phosphatic matter may have exi...sted, and, perhaps, may have extended to still lower forms of life, just as the appropriation in more modern times of phosphate of lime by the higher animals for their bones seems to have been accompanied by a diminution of its use in animals of lower grade.
The Laurentian apatite pretty constantly contains a small percentage of calcium fluoride ; and this salt also occurs in bones, more especially in certain fossil bones. This may in both cases be a chemical accident ; but it supplies an additional coincidence.
What to read after On Specimens of Eozoon Canadense And Their Geological And Other Relations?
You can find similar books in the "Read Also" column, or choose other free books by John William Dawson to read onlineMoreLess
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