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  Send us a textSea 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 PeopleJustin DixKey PlacesBonaparte GulfKey ConceptsGravity Earth Model (aka the lumpy potato)Further ReadingAnthony Fogg, Justin Dix, Helen Farr. Late Pleistocene Palaeo Environment Reconstruction from 3D Seismic data, NW Australia.The ACROSS project - Australasian Research: Origins of Seafaring to Sahul.  Authorea. January 06, 2020. 

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• Helen talks the ACROSS Project

  Send us a textIn 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 PeopleHelen FarrKey PlacesBonaparte GulfKey ProjectsACROSS ProjectFurther ReadingAnthony Fogg, Justin Dix, Helen Farr. Late Pleistocene Palaeo Environment Reconstruction from 3D Seismic data, NW Australia.The ACROSS project - Australasian Research: Origins of Seafaring to Sahul.  Authorea. January 06, 2020. 

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• Hooked from the start

  Send us a textThe rapid dispersal of modern humans across Wallacea to modern day Australia not only required boat technology for long-distance sea travel, but also knowledge about deep-sea fishing. In this episode, we talk to Sue O’Connor about the different routes that people may have taken across Wallacea in the Pleistocene and how the different kinds of islands on those routes may have influenced maritime resource use and the earliest evidence of pelagic fishing. Key PeopleSusan O'Connor - Australian National UniversityKey Sites / ConceptsAsitau Kuru / JerimalaiO'Connor, Sue, Ono, Rintaro, and Clarkson, Chris. Pelagic Fishing at 42,000 Years Before the Present and the Maritime Skills of Modern Humans.Science334,1117-1121(2011).DOI:10.1126/science.1207703KisarO’Connor, S., Mahirta, Kealy, S., Boulanger, C., Maloney, T., Hawkins, S., … Louys, J. (2018). Kisar and the Archaeology of Small Islands in the Wallacean Archipelago. The Journal of Island and Coastal Archaeology, 14(2), 198–225. https://doi.org/10.1080/15564894.2018.1443171 Laili O’Connor, Sue, Ceri Shipton, and Shimona Kealy. "The southern route to Sahul: modern human dispersal and adaptation in the pleistocene." The Prehistory of Human Migration-Human Expansion, Resource Use, and Mortuary Practice in Maritime Asia. IntechOpen, 2023. Shipton, C., Morley, M.W., Kealy, S. et al. Abrupt onset of intensive human occupation 44,000 years ago on the threshold of Sahul. Nat Commun 15, 4193 (2024). https://doi.org/10.1038/s41467-024-48395-x Maritime NetworksO’Connor, S., Kealy, S., Reepmeyer, C., Samper Carro, S. C., & Shipton, C. (2022). Terminal Pleistocene emergence of maritime interaction networks across Wallacea. World Archaeology, 54(2), 244–263. https://doi.org/10.1080/00438243.2023.2172072Pleistocene female burial with fish hooks O’Connor S, Mahirta, Samper Carro SC, et al. Fishing in life and death: Pleistocene fish-hooks from a burial context on Alor Island, Indonesia. Antiquity. 2017;91(360):1451-1468. doi:10.15184/aqy.2017.186 

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• Before Us+ Erich answers some of our fan mail

  Send us a textIn this special bonus episode, Erich answers some of the fantastic questions that we've received from listeners around the world. If you want to send us your own questions about anything you've heard on Before Us, or just comment in general, please hit the "send us a text" button above every episode description. We would love to hear from you!

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• Living large yet so small

  Send us a textThe discovery of Homo floresiensis and Homo luzonensis in SE Asia raises big questions about what happened to some early populations of migrants. Here, John McNabb, explains how these discoveries re-shape our understanding of human evolution and human migrations, but also what the world was like when modern humans began to expand out of Africa. It may have been much more crowded than previously thought!Key SiteLiang BuaMata mengeDmanisiKey PeopleJohn McNabb (Mac)Mike MorewoodKey HominidsHomo floresiensisHomo luzonensisHomo erectusDenisovanMore ReadingBrumm, A., van den Bergh, G., Storey, M. et al. Age and context of the oldest known hominin fossils from Flores. Nature 534, 249–253 (2016). https://doi.org/10.1038/nature17663 Baab, K. L. (2012) Homo floresiensis: Making Sense of the Small-Bodied Hominin Fossils from Flores . Nature Education Knowledge 3(9):4 Détroit, F., Mijares, A.S., Corny, J. et al. A new species of Homo from the Late Pleistocene of the Philippines. Nature 568, 181–186 (2019). https://doi.org/10.1038/s41586-019-1067-9 

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