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... Science Frontiers ONLINE No. 2: January 1978 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects How real are biological extinctions in the fossil record?Much has been made by catastrophists of the apparent wholesale extinctions of many forms of life from one geological period to another. Some uniformitarians have been arguing all along that these so-called extinctions are more apparent than real. The present study supports this view with its study of world-wide records of the Triassic-Jurassic transition period. Correlation of U.S . and South African rocks imply that this key geological interface was actually a period of gradual faunal replacement rather than sudden, simultaneous extinction of live forms. (Olsen, Paul E., and Galton, Peter M.; "Triassic-Jurassic Tetrapod Extinctions: Are They Real?" Science, 197:983, 1977.) From Science Frontiers #2 , January 1978 . 1978-2000 William R. Corliss ...
Terms matched: 1 - Score: 25 - 15 May 2017 - URL: /sf002/sf002p09.htm
... after considerable controversy, along come two crowsize skeletons that are not only 75 million years older than Archaeopteryx but also more birdlike, according to the paleontologists who discovered them. The Washington, D.C .- based National Geographic Society, which funded the work, announced this week that Sankar Chatterjee and his colleagues at Texas Tech University in Lubbock found the 225-million-year-old fossils near Post, Tex." (Weisburd, S.; "Oldest Bird and Longest Dinosaur," Science News, 130:103, 1986.) Chatterjee has named the new fossil Protoavis. "Protoavis seems certain to reopen the long-running controversy on the evolution of birds. In particular whether the common ancestor of birds and dinosaurs was itself a dinosaur. Protoavis, from the late Triassic, appears at the time of the earliest dinosaurs, and if the identification is upheld it seems likely that it will be used to argue against the view of John Ostrom of Yale University that birds are descended from the dinosaurs. It also tends to confirm what many paleontologists have long suspected, that Archaeopteryx is not on the direct line to modern birds. It is in some ways more reptilian than Protoavis, and the period between the late Jurassic Archaeopteryx and the world-wide radiation of birds in the Cretaceous has to some seemed suspiciously brief." (Anonymous; "Fossil Bird Shakes Evolutionary Hypotheses," Nature, 322:677, 1986.) Comment. But what about all those textbooks that assure us positively that birds descended from dinosaurs and that Archaeopteryx is a classic missing link ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf048/sf048p11.htm
... Science Frontiers ONLINE No. 2: January 1978 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Will radiohalos in coalified wood upset geological clocks?In some coalified wood, uranium-rich solutions have deposited radioactive particles that subsequently decay and create little rings (halos) that can be seen under high magnification. The ra-dii of the rings depend upon the energies of the particles emitted by the radioactive elements. Each type of radioactive decay has a specific half-life. Thus, the patterns of radiohalos help measure the age of coalified wood. A challenge to geology arises because the radiohalos in coalified wood from Jurassic and Triassic formations, supposedly millions of years old, suggest ages of only a few thousand years. (Connor, Steven J.; "Radiohalos in Coalified Wood: New Evidence for a Young Earth," Creation Research Society Quarterly, 14:101, 1977.) From Science Frontiers #2 , January 1978 . 1978-2000 William R. Corliss ...
Terms matched: 1 - Score: 13 - 15 May 2017 - URL: /sf002/sf002p08.htm