geological

The researchers were able to measure carbon, oxygen, strontium and lead isotopes from the tooth which revealed changes to the animal's diet with the seasons and showed seasonal food sources came from different geological areas.

Layer it all in a shallow casserole dish or, if you’re feeling theatrical, a glass trifle dish, so the strata show through like geological layers of flavors.

Last year, Williams examined 1,200 years of geological records and found that the previous 25 years were probably the driest quarter of a century since the year 800.

"This is a geological environment different to most others - it's really exciting," he says.

Nelson's project takes its name from the term Anthropocene - the current geological epoch where human activity has become the dominant force shaping the Earth's environment.