Washington, April 28 : New scientific evidence suggests that dinosaur bones from the Ojo Alamo Sandstone in the San Juan Basin, USA, date from after the mass extinction event, and that dinos may have survived in a remote area of what is now New Mexico and Colorado for up to half a million years, in a scenario resembling that of the fictional `Lost World'.

This controversial new research, 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," said 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 explained.

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.

The first step must be to demonstrate that the rocks containing the bones are younger than the 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 from the Ojo Alamo Sandstone 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.

According to Fassett, 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.

"One thing is certain. If dinosaurs did survive, they were not as widespread as they were before the end of the Cretaceous and did not persist for long," said David Polly, one of the editors of the journal in which the research is published. (ANI)