The oldest fossilised remains of complex animals appear suddenly in the fossil record, and as if from nowhere, in rocks that are 538 million years old.
The very oldest of these are simple fossilised marks (called Treptichnus) made by something…
The oldest fossilised remains of complex animals appear suddenly in the fossil record, and as if from nowhere, in rocks that are 538 million years old.
The very oldest of these are simple fossilised marks (called Treptichnus) made by something…