Last Known Dinosaur
July 14, 2011 by staff
Last Known Dinosaur, The extinction of the last dinosaur known and the events that ultimately caused long was a topic of discussion. But now, a dinosaur fossil points to a catastrophic end to the Age of Dinosaurs, rather than a gradual process, as some researchers, reports The Christian Science Monitor.
The findings of scientists in Montana are described in the journal Biology Letters, published on Wednesday. It has been widely accepted by scientists that a cosmic impact occurred about 65 million years ago during a time called Cretaceous-Tertiary, or KT. But what is clear is whether mass extinctions were gradually from before the meteorite impact, due to volcanoes or other factors.
A land area below the KT boundary, which supposedly has no dinosaur fossils, motivates the controversy. Some scientists point to the gap, which is located in the western interior of North America, as evidence that dinosaurs might have died before any impact.
Opponents say that it lacks the layer of fossils, since they can easily get destroyed for millions of years and that the placement of the KT boundary can be uncertain, ie, the dinosaurs may have been found in the area before, but not reported like that.
But the report published in Biology Letters, scientists discovered a fossil in the supposedly sterile. The finding, which is a dinosaur horn of 13 inches below the impact layer, the sample makes it closer to the end of the age of dinosaurs found, however, according to The Christian Science Monitor.
The horn was found last year in the Hell Creek Formation in southeastern Montana and probably belonged to a Triceratops.
Tyler Lyson researcher, a vertebrate paleontologist at Yale University, told LiveScience, just because “we have a dinosaur in space, not necessarily falsify the idea that dinosaurs were gradually decreasing in numbers. However, this finding indicates that at least some dinosaurs were doing fine until the KT boundary. ”
Lyson said: “We must do more field work to find more dinosaurs in the gap of three meters. I am sure that the field research, we find more dinosaurs in this range.”
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