The earliest well-known pterosaurs lived about 220 million years back in the Triassic period, and the last ones passed away about 65 million years earlier at the end of the Cretaceous period. Actually, the early risers existed at the same time as several of the pterosaurs, but birds handled to endure the mass extinctions at the end of the Cretaceous period while pterosaurs did not. Not only was Quetzalcoatlus the among biggest of the pterosaurs, it was the last. Huge Bend's rocks are very important to this research study due to the fact that the K-T border is well preserved, is plainly subjected, and is just one of the southernmost exposures of terrestrial stratified rocks of that time period. A meteor may have completed points with a bang, the real perpetrator in most of the Cretaceous terminations was long-term global climate change. In 1971, Douglas A. Lawson, a student at the University of Texas in Austin, was carrying out geological field operate in Big Bend National Park for his master's thesis when he found a fossil bone wearing down out of an arroyo bank. Succeeding excavations recuperated more wing bones, but unfortunately the wing should have detached from the body before being buried and fossilized, since no body bones might be found. Dr. Langston remained to look for and research study Big Bend fossils and ultimately found other samplings of Quetzalcoatlus in another part of the park. Comparison of these complete samplings with the substantial bones of the original Quetzalcoatlus made it possible to determine the body dimension of Lawson's specimen.
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