Word: glomar
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Though this scenario for the beginning of the ice age has been well documented by fossil records, scientists have long been uncertain about what caused the cooling. Now, after studying cylindrical-core samples of ocean sediment dug up by the deep-sea drilling ship Glomar Challenger, two University of Rhode Island researchers have found evidence that may help provide the answer. The telltale position of layers of volcanic ash found in the cores by Geologists James Kennett and Robert Thunell suggests that the first great ice age could have been set off by a worldwide series of volcanic eruptions...
...seems clear that the layers of ash in the Glomar Challenger's cores are the residue of more than one volcanic eruption. Kennett and Thunell point out that the ash is so widely distributed, ranging from the arcs of volcanic islands in the Pacific to volcanically active regions in Central America and the mid-Atlantic, that it can best be explained by a sharp and worldwide increase in volcanic activity...
Geologists Ian Dalziel of Columbia University and Peter Barker of the University of Birmingham led a multinational scientific team aboard the research ship Glomar Challenger this spring, probing the ocean depths east of the Falkland Islands. Lowering a coring drill 8,500 ft. to the bottom, they penetrated through 1,835 ft. of sediment before beginning to bite into the solid rock that they were looking for. Analysis of the core samples brought to the surface identified it as granite about 600 million years old. The find proved that the rock was continental shelf and not ocean basin crust, which...
...Gondwanaland similar to the Mediterranean and bounded by what are now South America, Africa and Antarctica. Then, as the continents began to separate, the area round the ancient sea gradually sank, reached its present depth about 80 million years ago, and remained hidden until the spring voyage of the Glomar Challenger...
Last week the Glomar Challenger again made news. Another team of geologists announced that in July a drill lowered from the ship in midocean, about 200 miles southwest of the Azores, had penetrated 1,910 ft. into the earth's hard crust under the Atlantic bottom sediment. It returned core samples from depths never before explored; the previous record penetration was 260 ft. into the submarine crustal rock. Said Geochemist William Melson of the Smithsonian Institution: "It was like probing into the unknown, getting samples we had thought about for years but had never been able to reach...