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, with the destination out of sight the whole way, even when the sea stood at its lowest. People did it, and arrived carrying ground-edge axes and ochre. Tens of thousands of worked stones lie below the dated level at the northern Australian site that fixes the date.

Why it matters

This is the oldest evidence that humans planned a journey whose end they could not see. Everything before it can be explained by walking far enough. This one required believing there was something out there, and building for it.

Dating & uncertainty

The date comes from luminescence dating of sand grains at Madjedbebe in northern Australia, with tens of thousands of artefacts below the level. Some researchers read the site's stratigraphy differently and prefer a younger arrival near 50,000 years.

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