Water you waiting for?
04/15/25 • 22 min
Sea levels rise and fall in response to complex planetary drivers, including shifts in polar ice caps, land masses, and other factors. Understanding these processes is crucial for studying prehistory in deep time, including human migration from Sundaland to Sahul and the movement of people around the globe. In this episode, Justin Dix breaks down what drives sea level change, how scientists reconstruct past sea levels, and how these fluctuations have shaped human history.
Key People
Key Places
Key Concepts
Gravity Earth Model (aka the lumpy potato)
Further Reading
Sea levels rise and fall in response to complex planetary drivers, including shifts in polar ice caps, land masses, and other factors. Understanding these processes is crucial for studying prehistory in deep time, including human migration from Sundaland to Sahul and the movement of people around the globe. In this episode, Justin Dix breaks down what drives sea level change, how scientists reconstruct past sea levels, and how these fluctuations have shaped human history.
Key People
Key Places
Key Concepts
Gravity Earth Model (aka the lumpy potato)
Further Reading
Previous Episode
Helen talks the ACROSS Project
In this episode, we speak with Before Us co-host Helen Farr about her European Research Council project, Australasian Colonisation Research: Origins of Seafaring to Sahul—or simply, ACROSS. This ambitious project dives into oceanographic, geoscience, archaeological, and archaeogenetic data to figure out when and how people first made the journey to Sahul, what routes they might’ve taken, and just how long they were stuck in a boat. Spoiler: it wasn’t a weekend trip. These early voyages don’t just tell us about getting to Sahul—they also help us understand the bigger picture of how modern humans spread around the world. Think of it as the original travel blog...but with fewer selfies and more science.
Key People
Key Places
Key Projects
Further Reading
Next Episode
Going with the Flow
There is unambiguous agreement that early humans had to cross open water when they traveled from Sundaland to Sahul before 40,000 years ago. How were they able to do this and would ocean winds and currents have helped or hindered their voyages? In this episode we talk to Kiki Kuijjer and Bob Marsh, both from the University of Southampton, about flow modeling that potentially reveals how humans may have been able to make their fantastical journeys.
Key People
Further Reading
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