Lifes Dawn On Earth Being the History of the Oldest Known Fossil Remains And
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Taking the specimens preserved by serpentine as typical, we now turn to certain other and, in some respects, less characteristic specimens, which are never- theless very instructive. At the Calumet some of the masses are partly filled with serpentine and partly with white pyroxene, an anhydrous silicate of lime and magnesia. The two minerals can readily be dis- tinguished when viewed with polarized light ; and in some slices I have seen part of a chamber or group of canals filled with serpentin...e and part with pyroxene. In this case the pyroxene or the materials which now compose it, must have been introduced by infiltration, as well as the serpentine. This is the more remarkable as pyroxene is most usually found as an ingredient of igneous rocks; but Dr. Hunt has shown that in the Laurentian limestones and also in veins traversing them, it occurs under conditions which imply its depo- sition from water, either cold or warm. Giimbel remarks on this : " Hunt, in a very ingenious THE PRESERVATION OF EOZOON.
What to read after Lifes Dawn On Earth Being the History of the Oldest Known Fossil Remains And?
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To quickly assess the difficulty of the text, read a short excerpt:
Taking the specimens preserved by serpentine as typical, we now turn to certain other and, in some respects, less characteristic specimens, which are never- theless very instructive. At the Calumet some of the masses are partly filled with serpentine and partly with white pyroxene, an anhydrous silicate of lime and magnesia. The two minerals can readily be dis- tinguished when viewed with polarized light ; and in some slices I have seen part of a chamber or group of canals filled with serpentin...e and part with pyroxene. In this case the pyroxene or the materials which now compose it, must have been introduced by infiltration, as well as the serpentine. This is the more remarkable as pyroxene is most usually found as an ingredient of igneous rocks; but Dr. Hunt has shown that in the Laurentian limestones and also in veins traversing them, it occurs under conditions which imply its depo- sition from water, either cold or warm. Giimbel remarks on this : " Hunt, in a very ingenious THE PRESERVATION OF EOZOON.
What to read after Lifes Dawn On Earth Being the History of the Oldest Known Fossil Remains And?
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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