28 April 2009
Lost world... found?
by Kate Melville
New evidence suggests that dinosaur bones found in the San Juan Basin date from after the supposed dino-doomsday, and that dinosaurs may have survived in what is now New Mexico and Colorado for up to half-a-million years. This controversial new research, published in the journal Palaeontologia Electronica, is based on detailed chemical investigations of the dinosaur bones, and evidence for the age of the rocks in which they are found.
"The great difficulty with this hypothesis - that these are the remains of dinosaurs that survived - is ruling out the possibility that the bones date from before the extinction," says Jim Fassett, author of the research. "After being killed and deposited in sands and muds, it is possible for bones to be exhumed by rivers and then incorporated into younger rocks" he explains. This is not the usual way in which fossil deposits of this kind form, but it has been shown to explain some other post-extinction dinosaur bones. Fassett has amassed a range of evidence that indicates that these fossils from the Ojo Alamo Sandstone were not exhumed and redeposited and that these dinosaurs really did live after the end Cretaceous extinction event.
Fassett has analyzed the magnetic polarity of the rocks, and the pollen grains they contain, different approaches to finding the age of rocks which, he concludes; "independently indicate that they do indeed post-date the extinction." Fassett also found that "the dinosaur bones in question have distinctly different concentrations of rare earth metal elements to the bones in the underlying Cretaceous rocks," and this, he argues, "makes it very unlikely that the post-extinction bones were exhumed from the underlying sediments." This is supported by a find of 34 hadrosaur bones together - "these are not literally an articulated skeleton, but the bones are doubtless from a single animal" - if the bones had been exhumed by a river, they would have been scattered, goes the theory.
Does this provide conclusive proof that dinosaurs survived the Cretaceous extinctions? According to David Polly, one of the editors of the journal in which the research is published; "this is a controversial conclusion, and many paleontologists will remain skeptical but we already know that flying theropod dinosaurs [more generally referred to as birds] and crocodiles survived, so the possibility of pockets of survivors of other types of dinosaur is not quite as far fetched as it might sound." Finding conclusive evidence, however, is a difficult matter when the crime scene is 65 million years old. "One thing is certain," continues Polly, "if dinosaurs did survive, they were not as widespread as they were before the end of the Cretaceous and did not persist for long."
Source: The Palaeontological Association