HUMAN EVOLUTION × TECHNOLOGY

The First Sea Crossing

~65,000 years ago

Phanerozoic · Cenozoic · Quaternary · Pleistocene · Late Pleistocene

Reaching Australia meant crossing at least eighty kilometres of open water, the destination out of sight the whole way, even when the sea stood at its lowest. People did it, and came ashore carrying ground-edge axes and ochre. At the rock shelter in northern Australia that gives the age, tens of thousands of worked stones lie below the dated level.

Why it matters

No older evidence shows humans planning a journey whose end they could not see. Everything earlier can be explained by walking far enough. This crossing required believing there was something out there, and building for it.

Dating & uncertainty

The date comes from luminescence dating of sand grains at Madjedbebe, a rock shelter in northern Australia, with tens of thousands of artefacts beneath the dated layer. A team reviewing the regional evidence reads the deposit differently and judges any age beyond 50,000 years unlikely, which would bring the arrival close to that figure.

Sources

1. Clarkson et al. (2017), Nature · Human occupation of northern Australia by 65,000 years ago
2. O'Connell et al. (2018), PNAS · When did Homo sapiens first reach Southeast Asia and Sahul?

Earth history as one day

23:59:581.2 s before midnight

if Earth’s 4.54 billion years were compressed into a single day