Abstract
IT seems from the concluding paragraphs of the report of the Challenger Observations in NATURE, vol. xi. p. 116, that the dredge has at length settled the question of the mode of deposition of marine boulder clay, and shown that in the Southern Ocean it is now being formed over areas perhaps as great as those now covered with similar deposits in the northern hemisphere. The facts stated show (1) The deposition of a bed of mud and sand with fragments of stones from floating ice; (2) That this deposit is so rapid as completely to mask or supersede the ordinary deposition of organic slime; and (3) That in certain areas of deep water there is a possibility that an excess of carbonic acid may remove all trace of calcareous organisms. It is further to be observed that, owing to the small amount of land, the conditions are probably much less favourable than those which existed in the north at the time of the great Post-pliocene subsidence.
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DAWSON, J. Marine Boulder Clay, and other Deposits. Nature 11, 306 (1875). https://doi.org/10.1038/011306a0
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DOI: https://doi.org/10.1038/011306a0
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