Parker Snow, Two Years' Cruise off the Tierra del Fuego, the Falkland Islands, &c. (1857); Sir C. Wyville Thomson, Voyage of the " Challenger " (1877); C. P. Lucas, Historical Geography of the British Colonies, vol.
" Challenger " round the world says " of measured seas the Sardonian is the deepest with full under the scientific direction of Sir Wyville Thomson and the one thousand fathoms " (i.
The successor of Sir Wyville Thomson in the Sea, in 65° N.
The existence of the latter, which extends to the African continent, was announced by Sir Wyville Thomson in 1876 as a result of his discussion of the deep-sea temperature observations of the " Challenger " expedition, though the fact was not confirmed by soundings until many years later.
M.) with depths down to 2200 fathoms. A rise between Spitsbergen and Greenland separates the Norwegian Trough (greatest depth 2005 fathoms in 68° 21' N., 2° 5' W.) which in turn is divided from the Atlantic by the Wyville Thomson Ridge which runs between the Faeroe and Shetland islands and is covered by only 314 fathoms of water at the deepest point.
Red clay was discovered and named by Sir Wyville Thomson on the " Challenger " in 1873 when sounding in depths of 2700 fathoms on the way from the Canary Islands to St Thomas.
In exceptional cases, when a strong deep current does flow over a rise, as in the case of the Wyville Thomson Ridge, the bottom is swept clear of fine sediment.
- Sir C. Wyville Thomson, The Depths of the Sea (cruises of " Porcupine " and " Lightning ") (London, 1873); The Atlantic (cruise of " Challenger ") (London, 1877); Die Forschungsreise S.M.S.
The chief summits are Mounts Ross (6120 ft.), Richards (4000), Crozier (3251), Wyville Thomson (3160), Hooker (2600), Moseley (2400).
He assisted Sir Wyville Thomson in the examination and classification of the collections of the "Challenger" exploring expedition, and wrote the Review of the Echini (2 vols., 1872-1874) in the reports.