The famous case is when when American paleontologist Mary Schweitzer of North Carolina State University discovered collagen fibers in the fossilized leg bone of a T rex. Bio-film (a product of more recent bacterial action), cant explain the presence of proteins or DNA. The new skull of D. matildae is nearly indistinguishable from that of the Argentinian dinosaur, Sarmientosaurus musacchioi. They are not calling them biofilms or instances of contamination. "What we found was unusual, because it was still soft and still transparent and still flexible," Schweitzer told LiveScience. Heads I win, tails you lose But carbon-14 dating won't work on dinosaur bones. "Understanding Evolution for Teachers: Radiometric Dating." How did scientists find soft tissue in dinosaur fossils? After a two-year retrieval process, Jack Horner, director of the Museum, gave the femur bone to Schweitzer. Dinosaurs in the Fossil Record The last step may be the trickiest: Possibly the most controversial part of reconstructing a dinosaur's appearance is determining what, exactly, their faces looked like. The biblical explanation mainly involves rapid processes over short periods of time, whereas the Uniformitarian explanation mainly involves slow processes over long periods of time. Her first report of the preserved tissue ( Science, 25 March 2005, p. 1952) was based on preliminary tests. These regions are the most protected within the collagen fiber. The first-of-its-kind find reveals how sauropods may have moved between Australia and South America during the mid-Cretaceous. The flood was followed by an ice age during which there were volcanic and glacial impacts. By entering your email and clicking Sign Up, you're agreeing to let us send you customized marketing messages about us and our advertising partners. Based on similarities in the part of the skull surrounding the brain, the bones at the back end of the jaw joint and the curved and conical teeth, the new fossil supports the idea that these two dinosaurs were close relatives, per the statement. Controversial T. Rex Find Finally Has An Explanation, Copyright 2013 LiveScience, a TechMediaNetwork company. (1/2/2008) http://space.newscientist.com/article/mg13117884.900-rock-of-ages--cleft-by-laser-if-you-want-to-date-a-rockget-a-laser-thats-the-message-for-geologists-interested-in-the-preciseageof-anything-from-moon-rocks-to-hominid-fossils-.html, Museum Victoria.
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