Tuesday, May 11, 2010

They did fly!

The discovery of Archeopteryx caused a stir in the paleontology community, as it was the first sign that dinosaurs possessed feathers, and it was described as the missing link between dinosaurs and birds. As fossils do not preserve soft tissues like feather and skin, the only proof for the feathers were imprints in the rock, and some scientists argued that it was some other sort of soft tissue that caused these marks.
Now, though, the debate is over. Using light, scientists were able to determine the elements in different parts of the fossils, identifying chemically the presence of feathers 150 million years ago.
The findings were published Monday in the Proceedings of the National Academy of Sciences. The study was lead by Uwe Bergmann, a physicist at the Synchrotron Radiation Light Source SLAC National Accelerator Laboratory.
The use of sensitive X-rays were able to determine chemicals such as sulfur and phosphorus in the feathers, which differed from the iron and copper in the bones. Scientists hope that this technology can be used on soft tissue on older fossils, and hopefully on ancient soft-bodied organisms that lacked any sort of skeletal structure at all.

Tuesday, May 4, 2010

The Sheer Wrongness of Jurassic Park

Most people are familiar with dinosaurs in what they see in movies and popular culture, as tomes on paleontology are heavy and use vocabulary too difficult for the average reader. Steven Speilberg’s movie Jurassic Park is one of the most influential movies on the public’s image on dinosaurs. There’s many inaccuracies, which have given the public a false view on these extinct creatures.

The movie is based off the novel of the same name, written by the now-deceased Micheal Crichton. Crichton worked with Spielberg in writing the screenplay, agreeing where certain elements would look better in film (like falling through a tree in the Jeep), but some dinosaurs were “embellished” to look better. The novel as a whole was more biologically correct than the movie, though there were still some errors within.

The Velociraptors were the main antagonist of both the novel and movie, though they were grossly put out of proportion. In the novel, they were as large as a full grown adult, and in the movie , one can clearly see that the terrified children are smaller than the raptors. In real life, they were three feet tall at the shoulder, at most. Crichton wrote the raptors actually as Deinonychus, a much larger raptor-like species. At the time of writing, scientists thought that they were both raptors, though by the time the movie came out, no one corrected this fact. The fossils of the raptors were also found in Montana in both book and film, though Velociraptor lived in Mongolia. They were also shown without feathers, but that fact wasn’t known at the time, so one cannot place as much blame there.

The Diloposaurus can be remembered as the cute little dinosaur with a frill that killed the fat programmer by spitting a sticky poison in his eyes. These dinos were actually much larger in real life, and sported neither a frill nor venom; all the changes were done just for looks.

The Tyrannosaurus was ultimately the savior of the human characters, and also one of the most immediately recognizable dinosaurs before the movie came out. One of the earlier scenes of the movie is when the paleontologist tells everyone to stand still, so that the T. rex could not notice them, as it can only see by movement; most scientists today say that that is false. Another part of the scene is when they are chased by the dino while driving in their Jeep. The sheer amount of energy and muscle mass to move such a large dinosaur that fast and for that long would be biologically impossible, and a fall would mean they would never get up again.

Many other minor inaccuracies in the films give false ideas about what certain dinosaurs could do, but nowhere near like what happened with the species listed prior. Brachiosaurus was shown rearing, though that would have been physically impossible, Pteradons were shown with teeth, though they had toothless beaks, and Spinosaurus had improper teeth.

The movies and books sparked a new interest in dinosaurs and paleontology with the public, and brought Velociraptors from near obscurity to one of the most recognizable dinosaurs out there. Unfortunately, such media as films and novels need to stretch the truth in order to make the ordinary more fantastic or terrifying, though dinosaurs are amazing enough that they don’t need embellishing.

http://en.wikipedia.org/wiki/Biological_issues_in_Jurassic_Park

Little Giants


Brachiosaurus is one of the most recognizable dinosaurs of all. The huge, long necked dinosaur was a staple in Jurassic Park and The Land Before Time, and their size is one of their most distinguishable features: the largest fossil of a brachiosaur would have weighed about 28.7 tons, and it wasn’t even an adult. Their family, the titanosaurs, have a new member, which is the same in all but one factor: it’s size.

Magyarosaurs dacus is the name of a titanosaur species that was found in Transylvania, Romania in 1895. The fossil was dated at 75-70 million years ago. Current studies on the bone structure shows that the bones belonged to a full-grown individual, and not just a younger member.

Koen Stein and other paleontologists at the Steinmann Institute Division of Paleontology at the University of Bonn in Germany used slices of bone from multiple members of the species and microscopes to study blood vessels and the bone matrices to determine the ages of the individuals. They were able to tell that they full grown adults.

The species was first discovered by the sister of a paleontologist on their estate. At the time, pygmy and dwarf species were being found on islands, and the idea that Magyarosaurs dacus could also be a dwarf came to mind, but there was no way to prove it at the time. Most dwarfs lived on islands, where the ecosystems could not support larger creatures. Transylvania might have been an island in the past, and with neither enough food to support such a body, or predators to put them at risk, they were able to adapt into a smaller body to fit the environment better.


http://www.msnbc.msn.com/id/36948247/ns/technology_and_science-science/