The process of fossilising takes millions of years.

The ancient remains of the dinosaur were fossilised over millions of years.

Fossilisation is the process of preserving the remains or traces of organisms in rocks.

The archaeologists discovered a fossilised dinosaur bone.

The scientist carefully fossilises the ancient bones.

The museum has a collection of fossilisations from different time periods.

The fossilisable remains of ancient plants provide valuable information about Earth's history.