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... Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Two Tsumani Tales Only a few years ago astronomical catastrophism was denied as a major factor in geological change. Now one reads everywhere of huge terrestrial impact craters, iridium layers, and tektite deposits. Even so, one necessary consequence of 70% of the large impacts has been neglected until recently: the giant tsunamis and marine incursions that must have swept over the coasts of the continents following impacts at sea. This oversight is now being rectified. 100,000 BP. The South Pacific. A longstanding geological enigma of the New South Wales coastline is the curious distribution of sand dunes. Those headlands less than 40 meters high have lost most of their dunes, leaving only raw, unweathered rock. On the other ... , the higher headlands have retained these dunes. Australians B. Young and T. Bryant hypothesize that a tsunamis 40 meters high swept the lower headlands clean about 100,000 years ago. They can even plot the incoming wave's direction, because a few remnants of the coastal dunes still cling to the southwest corners of the headlands along the NSW coast south of Newcastle. In their scenario, the tsunamis came from the northeast, smashed into the Solomons, southeastern Australia, and northeastern New Zealand. The Great Barrier Reef protected northeastern Australia from the full force of the wave. Young and Bryant favor a Hawaiian landslip as the initiator of the tsunamis, but acknowledge that an asteroid impact could also have done the job. If the wave began near Hawaii, it would initially been about ...
Terms matched: 2 - Score: 183 - 15 May 2017 - URL: /sf085/sf085g11.htm
... Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Viking-introduced biological diversity in North America Who first mapped the West Coast of South America Astronomy Venus: telescopic shape-shifter Do some comets just go "poof" Cosmological voyeurism Biology Eyes: Adaptable, multimasked, and untasked Sperm transporters Knee light not effective? Geology Tunguska Confusion Mining for cosmic coal Geophysics Giant Australian marine incursions Amomalous Geysers Psychology Mind over blood Physics Element 0 ...
Terms matched: 2 - Score: 153 - 15 May 2017 - URL: /sf145/index.htm
... late Pleistocene. Hansen, however, along with geological iconoclast A. Kelly, demur. The Nebraska sanhills, they aver, were actually deposited by a wall of water sweeping down across the continent from the north -- very likely the consequence of an impact of a large asteroid. For more on Kelly's rejection of the eolian theory and many additional examples of deposits by huge tsunamis or marine incursions, see his book Impact Geology and/or category ETM7 in our catalog volume: Carolina Bays, Mima Mounds, etc. (To order the latter book, visit here .) (Hansen, Evan; personal communication, March 26, 1994.) From Science Frontiers #93, MAY-JUN 1994 . 1994-2000 William R. Corliss ...
Terms matched: 2 - Score: 142 - 15 May 2017 - URL: /sf093/sf093g11.htm
... Site 612 Bolide Event: New Evidence of a Late Eocene Impact-Wave Deposit and a Possible Impact Site, U.S . East Coast," Geology , 20:771, 1992.) Comment. Our planet's land surfaces are also strewn with many debris deposits that are probably the consequence of giant impact waves. See ESM12 in Neglected Geological Anomalies, where they are termed "marine incursions". Ordering information here . From Science Frontiers #87, MAY-JUN 1993 . 1993-2000 William R. Corliss ...
Terms matched: 2 - Score: 132 - 15 May 2017 - URL: /sf087/sf087g12.htm
