Greenland's deep geological memory with Dr Julie Hollis
A few weeks before Holly set sail for Greenland with The Explorers Club and Adventure Canada’s 2026 Young Explorers Program, she and Anthony sat down with Dr Julie Hollis for a pre-expedition brief on everything Greenlandic geology!
Julie spent years mapping Greenland’s rocks and leading geology at Greenland’s Ministry of Mineral Resources, and she tells us that Greenland really is the one place she calls home. Together with Julie we read Greenland’s deep memory: from some of the oldest rocks on Earth near Nuuk, to the deep roots of a nearly two-billion-year-old volcanic arc along the south coast, to why Greenland’s resources are suddenly on the world stage. Plus, we hear the outrageous story of the one geologist to be sat on by a polar bear... 🐻❄️
So - tune in to hear about the Greenlandic geology Holly's about to sail through. And we've now also released Holly's mini-film, shot live from the field, all on her scientific notes from the edge of the ice... Go check that out next!
29 Sept 2026
Ancestry among the ashes: what volcanic records reveal about human evolution with Dr Hayden Dalton
Volcanologist Dr Hayden Dalton (University of Melbourne) joins Holly & Anthony with the science he's bringing to a fascinating human question: exactly how many hominin species were alive at the same time, in the same place, and were they really competing for the same resources?
Or... has the apparent overlap in existing timelines been an artifact of imprecise dating? Hayden reveals that scientists can now bracket ash layers to within about 800 years on rocks over a million years old, roughly a tenfold jump in precision from a couple of decades ago, and that new resolution is what makes it possible to test whether the overlap theory holds up (or not!). What an epic leap in science tech?!! Hayden walks us through the mystery of ancient 'trackways', that at over a million years old, preserves two different hominins' footprints in the same ash - proof, at least in that moment, that more than one species walked the same ground... You'll have to listen to find out what Hayden's age-dating reveals.Lastly, we pivot 360 to to Hayden's first volcanic love - kimberlites...
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Find us on Instagram @thegeoco (https://www.instagram.com/thegeoco/?hl=en)
Thanks to the Geological Society of Australia (https://www.gsa.org.au/) for making this episode of Wonder possible!
GeoCo comes to you from the traditional country of the Kaurna people of the Adelaide Plains, South Australia. We pay our respects to their Elders past, present, and emerging.
21 Sept 2026
Earthquakes, extinctions & deep microbiology: the discoveries made by scientific ocean drilling with Dr Ron Hackney
Pushing the frontiers of knowledge about our planet has never been so much fun! We've explored less of the ocean floor than we have the surface of Mars, so Dr Ron Hackney, director of ANZIC (the Australian New Zealand International Scientific Drilling Consortium), brought the ocean floor to us. Across three remarkable objects: a core from the fault that ruptured the 2011 Tōhoku earthquake; a set of microscopic radiolarian fossils; and the world-famous "day the dinosaurs died" core from the Gulf of Mexico; we trace what scientific ocean drilling can tell us about earthquakes, mass extinction, and life clinging on kilometres beneath the seafloor.
We also hear how Ron went from an Antarctica-obsessed undergraduate to leading Australia and New Zealand's role in international ocean drilling.
Thanks to the Geological Society of Australia for facilitating this episode, and so many Wonder episodes over the past couple of years.🔗 Find us at thegeoco.com.au 📸 Instagram & TikTok: @thegeoco 📰 Sign up to our newsletter: thegeoco.substack.comGeoCo connects to you from the traditional country of the Kaurna people of the Adelaide Plains, South Australia. We pay our respects to their Elders past, present, and emerging.
Who has been a guest on Wonder, by the Geo Co.
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Dr Steve Hill
Dr Andrew Merdith
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