Word: sediments
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Dates: during 1970-1979
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...History, found stone tools dating back 2.6 million years in the Afar region of Ethiopia. Two years later their team made an even more dramatic discovery. Not far from their first find, they uncovered the fossilized remnants of a 20-year-old female Australopithecus lying in a layer of sediment 3 million years old. Unlike most other fossils of early man ?a tooth here, a bone fragment there, occasionally a portion of a skull?this one comprised a good part of the skeleton...
...left school without graduating and set up a safari business on his own. The business did well, but Richard soon yearned to be back in the digs. Then, in 1963, on a chance flight over Lake Natron in northern Tanzania, he spotted what looked like interesting sediment beds and, encouraged by his parents, set off to explore the area. His first expedition proved to be a success; the team he assembled found a fragment from an Australopithecus robustus. He decided to become an anthropologist...
...meeting with the National Geographic Society's research committee and listened patiently as his father outlined plans for the coming year. Then, when the committee members turned to him, he surprised them by outlining some plans of his own. He had spotted some intriguing sediment layers and stone tools during a brief reconnaissance at Lake Turkana and asked for funds to go back for a closer look. Taken by his brashness, the committee granted his request. But it came with a warning: "If you find nothing you are never to come begging at our door again...
...discover and map the 47,000-mile-long globe-girdling system of ridges and rifts-a landmark in geology. Heezen also studied the role of turbidity currents (underwater rivers of mud) in shaping the contours of the sea floor, and theorized that glassy particles called tektites in the ocean sediment were the result of the collision of meteorites or comets with the earth. Heezen co-authored a book titled The Face of the Deep...
...international consortium of scientists is compiling a record of the earth's climate. Climatologist Lamb and his colleagues have assembled an accurate historical record of the seasons going back as far as 1400 A.D.-based on parish registers, government documents, monastery records, and such physical evidence as sediment deposits in lakes and growth rings in trees. Says Lamb: "The more we know about cycles of the past, the better we can work with the highly detailed and sophisticated observations we have of our weather today." Geophysicist Willi Dansgaard of the University of Copenhagen is studying cores taken from...