This discovery is so important to the scientific community because the plant-eating dinosaur dates back to 170 million years ago. This is when the dinosaurs first started to rule that animal kingdom. These fossils might prove to be useful in learning more about where and what the dinosaurs came from. They could figure out who they evolved from. The other dinosaur comes from around a mass extinction caused by an unknown object form space.
The Cause of the Dinosaur Extinction The biggest mystery surrounding the dinosaur is how did they die? For over 130 million years dinosaurs ruled the earth. Then 65 million years ago, at the end of the Cretaceous period, they died out. Nobody can really say what actually eliminated the species, although everyone has their very own idea. Asteroid impact, atmospheric changes (hot to cold), catastrophic eruptions and astronomical events (supernovas etc.).
The Debate Over Dinosaur Nostril Positioning Where should the nostril on dinosaur models be placed? Although it seems like a rather simple question, it is a topic that has been recently researched so that scientists can feel reassured in creating anatomically correct models of dinosaurs. Amniotes (a group which in the Triassic spilt into reptiles and synapsids and which include dinosaurs), have large nasal openings, but since the nostril is made up of flesh and cartilidge, it is almost always not preserved in the fossil record (Lauren and Gauthier 1996). These were often huge in dinosaurs, such as the sauropods, hadrosaurines, and ceratopsids, so that there are several places in which the nostrils could be placed. For many years, scientists have placed the nostrils on dinosaurs in the caudal position, which is located on the top of the head.
The asteroid was so large and landed with such force that it effectively ended the dinosaurs reign over the earth. However, recent evidence and research reported in Proceedings of the National Academy of Sciences suggests that this could not have been the case, because the Chicxulab crater predates the mass extinction by roughly 300,000 years. Rather, the evidence suggests that two or more impacts caused the mass extinction experienced by dinosaurs. Fossil records inform us that the mass extinction occurred 65 million years ago. This landmark coincides with and marks the Cretaceous-Tertiary (K-T) boundary.
Extinction of Dinosaurs due to Asteroid Impact Nobody knows for sure exactly how the dinosaurs became extinct. However scientists have speculated for decades about possible events that caused the dinosaurs to die out. Possibilities range from asteroids, to volcanoes, to climate changes. One of the more popular or well-known extinction theories involves the belief that an asteroid struck the Earth, causing devastating effects, and triggering mass extinctions around the end of the Cretaceous period. The asteroid impact extinction theory began in 1980 with Luis and Walter Alvarez, a father and son team.
However, according to the original scientific article the age is debatable. “Certain elements suggest a Late Jurassic age; radiometric work from several sites near Sihetun has suggested conflicting dates of 124.6 million years ago or 147 million years ago. The age of these beds is a complex problem and it is likely that several ages are represented at different quarry sites (Ji et al 2001).” According to the article the fossil was discovered by a team of American and Chinese scientists in the Yixian Formation in the Liaoning Province, China. This is the first dinosaur to be discovered with its body covering unbroken. The fossil has been identified as a type of dromaeosaur.
Another theory, massive climate change in the pre-historic atmosphere, caused all the dinosaurs to die. Some scientists believe that mammals out competed dinosaurs for food and other resources. The last theory that dinosaurs died due to a large amount of volcanism comes up in scientists list of theories as well. Many different theories of why dinosaurs went extinct include extinction by asteroid, mammals outcompeting dinosaurs, climate change and volcanism. The most popular theory of dinosaur extinction, the asteroid theory, says that dinosaurs died out because of a single, giant asteroid.
Investigation of the Polar Dinosaur Today we know through the evidence of fossils that dinosaur and other large reptiles once lived on every continent on earth. If you were a paleontologist in charge of finding fossils where would you look first? In the search for evidence the icy continent of Antarctica would be perhaps the last continent you would think to search. However, during the last twenty years a remarkable number of prehistoric fossils have been found in regions close to the South Pole. Beginning in 1960 with an expedition lead by a man named Spitzbergen, fossilized footprints from non-avian dinosaur showed the region once had a drastically different climate.
The religious view points toward Adams sin being the reason the dinosaurs were wiped out. The scientific point of view is that there was a cataclysmic asteroid impact that made them go extinct. Both are similar because the dinosaurs were wiped out either way. Scientists often think at times that the existence of dinosaurs and their demise is so shrouded in mystery, that people will never know what happened to them. According to Scientists dinosaurs first evolved around 235 million years ago, way before man evolved.
Besides being an oddity, what makes this particular find so significant? What are these implications that have riled some scientists up, and what is it that these experts argue? Before any sort of discussion on the debate of what M. gui implies, however, the details of this odd reptile’s discovered fossils should be given. Through past research and findings, the leading theory on the origin of birds traces them back to dinosaurs, more specifically a type of bipedal dinosaur called theropods. Within this group of mostly carnivorous dinosaurs are the dromaeosaurids, and they specifically are believed to be the closest dinosaur ancestors of birds.