jueves, 27 de agosto de 2015

Fossilised remains of Ice Age top predator dated with radiocarbon


The 61,000 year old lion’s claw, successfully carbon dated by the Australian Nuclear Science and Technology Organisation.Credit: ANSTO

ANSTO researchers using accelerator mass spectrometry (AMS) capabilities have assisted Russian palaeobiologists in dating rare fossils from an extinct cave lion that had been preserved in permafrost.

In collaborative research reported in the 17 August edition of Cosmos, research scientist Vladimir Levchenko and chemist Fiona Bertuch dated a fossilised bone, claw and hair found among the remnants of a near-complete skeleton of Panthera leo spelaea from a site in northeastern Russia.

Using ANSTO's ultrasensitive dating techniques, Levchenko determined the age of the bone to be over 61,000 years. "Because this sample came from permafrost and was relatively well preserved, there was enough good quality collagen to work with," said Levchenko.

Carbon extracted from animal hair was dated to 28,700 years but the inconsistency with the bone may be explained by contaminants in the fur.

Russian researchers led by I Kirillova of the Ice Age Museum in Moscow published their study in Quaternary Science Reviews following the discovery of 67 individual fossils in the Bilibino District of the Chukchi Autonomous Region in northeastern Russia. [...] phys.org