Search -
The depth and marine deposits of the Pacific
The depth and marine deposits of the Pacific Author:John Murray Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: BOTTOM SAMPLES COLLECTED DURING THE THIRD EXPEDITION OF DR. ALEXANDER AGASSIZ, 1899-1900. The bottom deposits collected by the " Albatross " during her 1899-1... more »900 cruise were received at the Challenger Office shortly after the return of the expedition, and were examined by Sir John Murray, Mr. James Chumley, and Mr. Robert Dykes. Dr. Alexander Agassiz published some remarks on the bottom deposits by Sir John Murray in the preliminary report already cited. Most of the mineralogical determinations have recently been revised by Dr. G. W. Lee, who has also examined the manganese nodules collected during this cruise, which were not forwarded to the Challenger Office till some considerable time after the deposit-samples. Dr. W. A. Caspar! has made a detailed study in the Challenger Office laboratory of the white pala- gonitic tuff from Station 2, and his results will be found in an appendix to this Report. The number of samples received from this cruise was 237, but, unfortunately, as many as 160 of these could not be fully described owing to the fact that in 97 cases the material had evidently been subjected to a certain amount of washing before reaching our hands, and in 53 other instances the amount of material available was too small to allow of a definite analysis being made. In 9 cases the material consisted of manganese nodules or rock fragments without any true deposit, and in one case the bottle in which the sample was contained was without any label or number, and the description of the material is, therefore, less important than it might otherwise have been. From these various causes the number of samples fully described in the following pages is reduced to 77. These are distributed in depth as follows: — Samples from less than 1000 fathoms 7 " " 1000 to 2000 " 10 ...« less