 ... extensive beds of iron ore, hundreds of feet thick, which abound in that ancient system, correspond not only to great volumes of strata deprived of that metal, but, as we may suppose, to organic matters, which but for the then great diffusion of...  The American Journal of Science and Arts - Page 3961861Full view - About this book
 | 1861 - 534 pages
...to organic matters, which but for the then greater diffusion of iron oxyd in conditions favourable for their oxydation, might have formed deposits of...than those beds of plumbago which we actually meet with in the Laurentian strata. All these conditions lead us then to conclude to the existence of an... | |
 | 1861 - 504 pages
...to organic matters, which but for the then greater diffusion of iron oxyd in conditions favourable for their oxydation, might have formed deposits of...than those beds of plumbago which we actually meet with in the Laurentian strata. All these conditions lead us then to conclude to the existence of an... | |
 | 1862 - 448 pages
...matters, which but for the then great diffusion of iron oxide in conditions favorable for their oxidation, might have formed deposits of mineral carbon far more...strata. All these conditions lead us then to conclude the existence of an abundant vegetation during the Laurentian period; nor are there wanting evidences... | |
 | 1862 - 446 pages
...matters, which but for the then great diffusion of iron oxide in conditions favorable for their oxidation, might have formed deposits of mineral carbon far more...strata. All these conditions lead us then to conclude the existence of an abundant vegetation during the Laurentian period; nor are there wanting evidences... | |
 | 1862 - 476 pages
...matters, which but for the then great diffusion of iron oxide in conditions favorable for their oxidation, might have formed deposits of mineral carbon far more...strata. All these conditions lead us then to conclude the existence of an abundant vegetation during the Laurentian period; nor are there wanting evidences... | |
 | 1865 - 458 pages
...which but for the then great diffusion of iron oxide in conditions favorable for their, oxidation, might have formed deposits of mineral carbon far more...strata. All these conditions lead us then to conclude the existence of an abundant vegetation during the Laurentian period; nor are there wanting evidences... | |
 | Geological Society of London - 1870 - 940 pages
...great diffusion of iron-oxyd in conditions favourable for their oxydation, might have formed deposita of mineral carbon far more extensive than those beds...strata. All these conditions lead us then to conclude the eiistence of an abundant vegetation during the Laurentian period." J Manual of Geology. I may also... | |
 | Geological Survey of Canada, Sir John William Dawson - 1871 - 210 pages
...great volumes of strata deprived of that metal, but, as we may suppose, to organic matters, which, hut for their oxydation might have formed deposits of mineral carbon far more extensive than those of plumbago which we actually meet in the Laurentian strata. All these conditions lead us then to conclude... | |
 | Sir John William Dawson - 1871 - 168 pages
...deprived of that metal, but, as we may suppose, to organic matters, which, but for their oxydatiou might have formed deposits of mineral carbon far more extensive than those of plumbago which we actually meet in the Laurentian strata. All these conditions lead us then to conclude... | |
 | Sir John William Dawson - 1875 - 278 pages
...which, but for the then great diffusion of iron-oxyd in conditions favourable for their oxidation, might have formed deposits of mineral carbon far more...strata. All these conditions lead us then to conclude the existence of an abundant vegetation during the Laurentian period. (C.) THE GRAPHITE OP THE LAURENTIAN.... | |
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