Fossil graveyards an archive of climate and ecology

Scientists will sometimes strike palaeontological gold and discover 'fossil graveyards', sites containing thousands or millions of animal bodies, which have fossilised allowing study today. Belinda Smith speaks to palaeontologists working at two very different types of fossil graveyard — one in Australia, the other in Canada — to find out what accumulated fossilised remains reveal about life on Earth before humans impacted the ecology and when climate was very different.