Jacques Piccard and Lieutenant Don Walsh of the United States Navy, piloted the Trieste to the sea floor in the deepest part of the Marianas Trench, known as the Challenger Deep. On January 23, 1960, the bathyscaph Trieste reached the greatest oceanic depth existing on our planet. Taylor in Bulletin of the Geological Society of America, Vol. In “Bearing of the Tertiary Mountain Belt on the Origin of the Earth’s Plan,” by F. "It is probably much nearer the truth to suppose that the mid-Atlantic ridge has remained unmoved, while the two continents on opposite sides of it have crept away in nearly parallel and opposite directions. It is apparently a sort of horst ridge – a residual ridge along a line of parting or rifting – the earth crust having moved away from it on both sides." The ridge is a submerged mountain range of a different type and origin from any other on the earth. "The persistence with which this feature maintains a medial position in the ocean bed for nearly 9,000 miles (following its great curves) is very striking, and the position which it takes in passing between South America and Africa is still more remarkable. It is well shown on Sir John Murray’s bathymetrical chart of the oceans." "One of the most remarkable and suggestive objects on the globe is the mid-Atlantic ridge. 93.ġ910 Sea-floor Spreading and Continental Drift: 1910 Version In Three Cruises of the Blake, (1888-1) by A. During the winter of 1881 to 1882 the Blake was engaged in developing the limit and general character of the great Atlantic Basin between the Bermudas and the Bahamas, and along the outside of the West India Islands as far to the eastward as St. Challenger in 1873, will make apparent the part taken by the Coast Survey in developing the configuration of the ocean-bed between the Bermudas and West India Islands, and northward to the Banks of Newfoundland, and in defining the limits of the continental plateau, which, extending from the coast to the hundred-fathom line, may be described as the western rim of this great basin of the North Atlantic. The depths and temperatures obtained by these officers, upon lines run across the course of the Gulf Stream, and connecting with those run by H.M.S. "Similar investigations” says Professor Hilgard in an account of the work of the Blake, "have since been prosecuted by Commanders Bartlett and Brownson, U.S.N., under the direction of the Superintendents of the Coast Survey, in the western part of the North Atlantic, - that great embayment, which, limited by Newfoundland on the north and by the Windward Islands on the south, might not be inaptly named the Gulf of North America. 112 - 113.ġ888-1 The Blake Working in the Western North Atlantic In Annual Report of the Superintendent of the Coast Survey for 1857 (1857) Published by William A. Published by Robert Armstrong, Printer, Washington. In Annual Report of the Superintendent of the Coast Survey, Showing the Progress of that Work During the Year 1857. ‘It will be perceived, by referring to the general chart of the bay, that there is a deep sub-marine valley, or “gulch,” directly in the middle of it, wide at the mouth, (taking the fifty fathom curve,) but narrowing very much as it approaches the shore, where deep water is found close to the very beach, and we discovered that this was the only practicable landing throughout the exposed portions of the bay." He thus referred to a peculiarity observed in the hydrography of Monterey bay. : “At the close of the last surveying season the hydrographic party of Commander Alden was engaged in Monterey bay and completed the soundings north of Point Pinos, including the entire bay, and extending to a line three miles west of Santa Cruz harbor. The discovery was reported in the 1857 Report of the Superintendent. Monterey Canyon, off the coast of central California, was the first of these features to be discovered. Submarine canyons were first discovered as a result of Coast Survey sounding operations.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |