Publisher's Synopsis
Excerpt from The Journal of the Quekett Microscopical Club, 1913-1915, Vol. 12
Murray and Renard estimate the area Of sea bottom over which Globigerina ooze is at present in' process Of formation at over 4921 million square miles. Of its depth we can, Of course, form no idea, but as the great oceans are practically permanent, it must be very great, because we know from deep-sea deposits which have been elevated into land surfaces in Malta, Barbados, Trinidad and Australasia, that Similar deposits have been forming in the deep sea ever Since at least Miocene times.
Prof; Agassiz has Observed N O lithological distinction of any value has been established between the chalk proper and the calcareous mud of the Atlantic, and it has been reasonably postulated by Prof. J ukes-brown after a careful analysis Of Calcareous oozes, that the chalk was deposited in a sea Of less than 500 fathoms, though doubtless at a considerable distance from land. The time occupied in the deposit Of the English chalk, arguing by the rate at which 'the Atlantic ooze is formed, which is one foot' in a century, must have been years.
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