Afleveringen
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What does cracking open green-shiny rocks in a German preschool have to do with feeding eight billion people without oil and gas? In this episode, we sit down with Prof. Oli Jagoutz, professor at MIT and director of the Earth Resources Laboratory (ERL), for a wide-ranging conversation that travels from the Himalayas to the wastewater treatment plant β and makes the case that geology might be one of the most societally relevant sciences of the coming decades.
Oli traces his winding path into the field: the son of a cosmochemist who dragged him along on mantle-sampling campaigns, a self-described "failed" almost-med-student who spent years climbing, traveling, and working as a nurse before discovering that he could inhale geology once he finally found it. His advice to late bloomers β it's not your age that matters, it's that you've figured out what you actually want.
From there the conversation digs into the Kohistan arc, the spectacular tilted-on-its-side cross-section of ancient island-arc crust now exposed in the Himalayas, and what it tells us about how continental crust forms (magmatic differentiation, water, and density sorting). Oli explains why he came to believe the textbook story of the IndiaβAsia collision was wrong β arguing the real collision happened closer to 40 million years ago, not 50 β and why that timing matters for understanding how mountain-building and tropical weathering of calcium- and magnesium-rich rocks may have reshaped global climate.
That climate thread becomes the pivot point of the episode. Oli describes walking away from the decades-old "origin of continental crust" question to chase problems with real-world stakes, and lays out the four areas his lab now tackles: carbon sequestration, critical minerals, geothermal energy, and geological hydrogen. Along the way he challenges the standard weathering-CO2 story (betting instead on the organic side β clays protecting buried organic matter), and walks through a genuinely clever carbon-sequestration scheme that uses sulfur-reducing bacteria and industrial waste gypsum to lock up carbon while making money by recovering elemental sulfur β a chemical the world will desperately need for fertilizer in a post-oil economy.
The episode closes on practical wisdom for students: master the fundamentals, stay broad, actually go to the talks (not just the beer), use tenure to fund "Neverland science," and recognize that an outsider's perspective β connecting dots others haven't β is often where the best ideas come from. Oli also explains how AI-driven, probabilistic "hygrometry" of whole-rock data is opening a new path for mineral prospectivity, and why he thinks metamorphic petrology β the chemistry of hot fluids reacting with rock underground β is the science of the future for mining, energy, and carbon storage alike.
How a cosmochemist dad and a broken finger started a career in geologyWhy coming to the field "late" can be an advantageThe Kohistan arc and the puzzle of how continental crust is madeRe-dating the IndiaβAsia collision β and why ~40 Ma changes the climate storyWeathering, CO2 drawdown, and the case for the organic carbon pathwayTurning sewage, gypsum, and bacteria into profitable carbon sequestrationSulfur, fertilizer, and the hidden product tree of oil and gasCritical minerals, geothermal, and geological hydrogen at MIT's ERLAI + whole-rock geochemistry for finding copper depositsWhy metamorphic petrology is the way of the futureAdvice for students who want to use geology to solve big problemsOli's "best day as a geologist"
In this episode
"Don't get discouraged when the community thinks you are wrong. You're probably right.""Just because I haven't worked on it doesn't mean I don't have anything to offer.""If you can't make it a business, it won't work.""Every day I go into the office and think: today I'm gonna find something awesome."
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This week we take on the FG test β the Fundamentals of Geology exam β the very first step on the road to becoming a professionally licensed geologist. Jesse just sat the exam this past fall (yes, a geology professor going back to take Geology 101), and we get into exactly what that was like: the nerves, the cram sessions, and the very real fear of an embarrassing fail.
We break down what's actually on the ASBOG FG exam β 110 multiple-choice questions across eight content domains, from general and field geology to hydrogeology, engineering geology, mineralogy, structure, and economic geology β and which sections scared us the most (looking at you, Darcy's law and soil mechanics). We talk through why university programs prepare students so differently, why the exam exists in the first place, and how we'd study for it if we only had two weeks.
Then we put it all to the test: Josh takes on a round of real and AI-generated practice questions live on the mic, and we share our honest take on using tools like Claude to build your own study guide. Whether you're a student staring down the FG exam, a geologist heading back to the field after years away, or just curious how much a PhD really remembers, this one's for you.
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A good study guide? Getting reps. Our Camp Geo mobile app is our intro-to-geology companion β grab it from the first link in the show notes.
Follow us @PlanetGeoCast on all social media, and reach out anytime through the contact link at planetgeocast.com. We'd love to hear from you.
Download the CampGeo app now at this link.
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You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
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Zijn er afleveringen die ontbreken?
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In this episode, we sit down with Dr. Mike Ackerson (Smithsonian) for the kick-off of a deep-dive series on granites and granitoids. This one goes into the weeds: the 250-year history of how arguing about granite shaped nearly every major idea in the geosciences.
We trace the great controversies from the 1700s to today:
π Neptunism vs. Plutonism β Did granite precipitate out of a global ocean, or crystallize from molten rock? How James Hutton's fingers of granite at Glen Tilt helped kill the Neptunist worldview.
β³ Uniformitarianism & deep time β How Charles Lyell's expansion of geologic time gave his friend Charles Darwin the temporal runway for natural selection. (Yes, the founder of biology was basically a geologist.)
π§ͺ Magmatists vs. Transformists ("granitizers") β The 20th-century brawl over whether granites are intruded magmas or rocks transformed in place by fluids β and how Bowen, Tuttle, and experimental petrology tipped the scales.
πͺ¨ The Room Problem β Walk across the Sierra Nevada and you cross miles of granite. How do you make space in the crust for that much rock? The 150-year-old puzzle that's still not fully resolved.
Plus: the legendary Norman Bowen "horse equilibria" letter, why H.H. Reid said "he who has seen the most rocks wins," and where the most exciting frontiers in granite petrology lie today β low-temperature magma storage, fluids in the crust, and links to geothermal energy and critical mineral ore deposits.
This is Part 1 of a series β future episodes will tackle the timescales of granite emplacement, geochronology, and a return to the Room Problem.
Want the intro-level foundation first? Download the CampGeo mobile app (first link below) for our textbook-style content on igneous rocks, including a full episode on Bowen's Reaction Series β what is granite, what is basalt, and all the basics.
#geology #granite #petrology #geoscience #earthscience #PlanetGeo #magma #JamesHutton #Darwin #science
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In this episode, we sat down with Keith Rapp, senior hydrogeologist, longtime volunteer with ASBOG (the Association of State Boards of Geology), and immediate past president of the organization. We dug into the professional geologist licensure process β what the FG (Fundamentals of Geology) and PG (Practice of Geology) exams actually test, how questions get written and vetted by panels of subject matter experts, why some states require licensure and others don't, and why Keith argues that licensure is fundamentally about protecting public health and safety.
Keith walked us through his path from growing up in Duluth with a geomicrobiologist uncle, to a master's in hydrogeology at Baylor, to a career cleaning up contaminated sites using microbes β what he calls hydrogeomicrobiochemistry. We talked about his current work on PFAS bioremediation, the idea of "pushing evolution" by engineering biofilm environments where microbes can adapt to degrade forever chemicals, and the role of zeolites as remediation media.
We also got into the practical stuff students and early-career geologists actually want to know: how to study for the FG exam, why test scores point you toward weak domains, what reciprocity between states looks like, the difference between an ASBOG license and an AIPG Certified Professional Geologist (CPG) designation, and why writing skills still matter in a hiring pile. We closed with a conversation about AI in geoscience β where it helps, where it gets you in trouble when your name is on a signed report, and how the profession should think about it going forward.
If you're a student preparing for the FG, a working geologist thinking about getting licensed in another state, or just curious about how a professional credentialing system gets built and maintained, this one is for you. The ASBOG annual meeting is in Hershey, PA this October β open to anyone interested in the profession.
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You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
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What distinguishes supervolcanoes from regular or non-super volcanoes? How many supervolcanoes are on Earth today? What are the precursors to supervolcano eruptions? In today's deep dive, Dr. Rachel Phillips, from GeoGirl, and I we got to talk to supervolcano researcher, Dr. Shan de Silva, to answer all your supervolcano questions (and more)!
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Download the CampGeo app now at this link.
On the app you can get tons of free content, exclusive images, and access to our Geology of National Parks series.
You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
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Jesse and Dr. Joshua Davis introduce a new series on professional geology licensure, prompted by listener questions, exam study use of their podcast, and continuing-education approvals. Jesse shares starting the U.S. process by taking the FG (Fundamentals of Geology) exam and explains the typical U.S. pathway in 31 states: FG exam, geologist-in-training status, years of work experience under a licensed geologist (with some state-dependent education carve-outs), then the PG exam and references. Josh contrasts Canada and the UK, noting the UKβs Chartered Geologist is less central, while Canadian systems are province-based and may restrict the βgeologistβ title; Quebec lacks an academic carve-out and requires supervised experience plus an exam. They discuss rationales for licensureβpublic protection, minimum geology competency amid changing degree names, professional trust, insurance coverage, employability, and continuing education.
Download the CampGeo app now at this link.
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You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
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Today Jesse talks with Christie Capper, founder and CEO of Deep Earth, which aims to visualize the subsurface by digitizing and unifying scattered underground data into accessible 3D maps. Christie describes her path from a toy-inventor upbringing to studying economics and mechanical engineering (robotics) at Claremont and Columbia, then working at SpaceX, interning at the UN and Boeing, moving into early-stage VC in Europe, and joining a fusion startup. Work in carbon removal and geothermal led her to subsurface problems; mining research highlighted boom-bust cycles and long development timelines, motivating a broader focus on faster-feedback markets like water, geothermal, utilities, and construction. She discusses pre-seed funding, network-driven early hires, first paying customers, lessons on pricing and execution, and how investor rejection sharpened the companyβs focus.
Download the CampGeo app now at this link.
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You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
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Chris is back!!
Today we answer the simple question - Why do we see a predictable geologic and topographic progression as we drive from flat plains into mountains?
We use examples from Michigan to Tennessee, the Canadian Rockies, Glacier, the Bighorns, Colorado, and the Appalachians to walk through a common sequence: we start on broad areas of mostly flat-lying sedimentary rocks (sandstones, shales, limestones) deposited in shallow seas, rivers, intertidal settings, and deserts; as we approach the range, we cross subtle, long-wavelength, low-amplitude folds that are often hard to notice without measurements; then we enter the fold-and-thrust belt where anticlines, synclines, and large thrust faults stack sedimentary packages and create dramatic ridges, valleys, and cliff faces (thin-skinned deformation).
We explain how the growing mountain load flexes the plate to form a foreland basin that fills with sediment eroded off the range, typically thickening and coarsening toward the mountains. Farther inboard, we describe how erosion and unloading help exhume deep, high-grade metamorphic βrootsβ in metamorphic core complexes (gneiss, schist, and other intensely metamorphosed rocks), and how overthickened crust can later relax and extend, aiding exhumation.
We also discuss how some mountain belts preserve suture-related features like ophiolite complexes, while others show subduction-related batholiths (e.g., Sierra Nevada, Idaho Batholith), and we note modern analogs such as the Persian Gulf foreland basin.
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On this episode of Planet Geo, we welcome Danielle Bennettβa startup operator with a venture capital background (and not a geoscientist by training) whoβs been talking with tons of geologists, hydrogeologists, and engineers while helping build a geoscience-adjacent mapping company at Deep Earth Tech. Danielle shares how growing up with entrepreneur parents (who ran a groundwater-focused engineering firm) shaped her path, why she started a social-impact company in college, and how she moved from corporate finance to FinTech and then into venture capital for about six years.
They dig into what sheβs learned from working with the geoscience communityβfriendly, non-confrontational, and highly opinionatedβand why geoscientists may be slower to found startups (a strong perfection/excellence culture and highly localized expertise).
Danielle breaks down βdeep techβ in practical terms (asset-heavy and/or science-and-engineering-driven tech), why capital is moving earlier into deep tech, and how VCs are increasingly pulling innovations from universities and incubators. The conversation also gets into which geoscience-adjacent areas feel investable (like shallow geothermal heating/cooling, critical minerals, and renewables) and why groundwater can be harder to fund due to public-agency buying cycles and complex bureaucracy.
Danielle closes by defining key funding termsβbootstrapping, debt financing, private equity, and venture capitalβplus what VCs look for (why now, why this team, and scale) and common red flags (unclear messaging, weak grasp of numbers, and unjustified mega-rounds).
We hope you enjoy this excellent interview!
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In this riveting episode, we catch up with Dr. Jonathan Stock, Chief Scientist for Innovation at NASA's Intelligent Systems Division. We dive deep into the realms of geosciences and discuss how innovation can transform our understanding of the Earth and beyond. From quantum gravity gradiometers to AI-driven geophysical mapping, Dr. Stock reveals the tech that could redefine geospatial exploration. We also ponder why geosciences lag behind other fields in entrepreneurship and innovation and how cross-disciplinary collaborations could be the game-changers we need. Join us as we weave through tales of awe-inspiring geological discoveries and the frontier spirit that keeps the field exciting.
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In this episode, we bring you a riveting Q&A session with GeoGirl Dr. Rachel Phillips and Dr. Joshua Davies, both experts in geology who explore the mysterious world of banded iron formations (BIFs). We dive deep into what BIFs are, when they formed, and their significance. Josh unpacks the debated origins of these rocks, discussing how they may be the most hotly contested rocks in the geological world due to our limited understanding of their formation process, despite their voluminous presence on Earth. We touch on how BIF layers represent cycles influenced by Milankovitch cycles, and whether microbial activity plays a role in their formation. Josh explains that while BIFs peters out around 1.8 billion years ago, there are unique conditions and debates on secondary processes that impact our current understanding. We humorously explore modern analogs, like weird anoxic lakes, and laugh about how our Earth would need a huge meteorite impact to revert to BIF-forming conditionsβa scenario we're not quite rooting for! Finally, we ponder the possibility of extraterrestrial BIFs, symbolizing our endless curiosity about space and deep time. This oneβs a dense, iron-packed dive for sureβjust like BIFs!
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In this episode, we are kicking off a new series on Geology News. We delve into why Venezuela is rich in oil, the complex tectonic interactions, and the geological formations that make it a hotspot for heavy, sour crude oil. We also take a humorous stroll down memory lane, reminiscing about our hard rock geology days and the unintuitive yet captivating world of sedimentary rocks. Join us as we explore why Venezuelan oil isn't just black gold but a treasure trove of geological intrigue.
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To kick off Season 6 of the Planet Geo Podcast, we invited Doug Heller, a Penn State alum and geoscience finance guru, to explore investment risk in the geosciences.
Doug shares thrilling stories about turning modest funds into substantial investments and offers invaluable advice for budding geologists and students. The episode delves into Doug's journey from exploring oil in the Gulf of Mexico to managing a complex bankruptcy case, and running Sun Specialty Products.
Doug sheds light on how to think about and manage risk, and provides tips for those interested in geoscience careers, the critical minerals sector, and much more. Join in for a fascinating conversation about the crossroads of geology and finance, complete with insightful risk analysis and career guidance for the next generation of geoscientists.
Download the CampGeo app now at this link.
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You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
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In this episode of Planet Geo, we dive deep into the fascinating phenomenon of petrification as we wrap up our season five re-release holiday series. From the beauty of petrified wood to its rare yet awe-inspiring occurrence, we explore how this natural wonder forms. We also tease exciting updates for season six, including segments with Dr. Rachel Phillips and interviews with top geoscientists. Strap in geologists and rock enthusiasts, because we're about to make some solid gains in your understanding of mother nature's mineralization marvels. And don't forget, the Camp Geo mobile app and our website have a treasure trove of geology content waiting for you!
Download the CampGeo app now at this link.
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You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
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Welcome back to Planet Geo, the podcast where we delve into the wonders of our planet's geology, how it works, and why it matters. In this episode, part three of our holiday re-release series, weβre breaking down the basics of rock identification and collection techniques. Chris and I tackle the popular question: how do you identify rocks? We provide a general strategy perfect for budding rock hounds and outdoor enthusiasts. Plus, stay tuned for new episodes and exciting modifications coming to Planet Geoβs sixth year, including deep dives with Dr. Rachel Phillips and geology news segments with Dr. Josh Davies. Follow us on social media and check out our Camp Geo mobile app for tons of free, cool content!
Today's discussion dives into the nitty-gritty of rock identification. We walk through our methods, distinguishing between sedimentary, metamorphic, and igneous rocks, and share handy tips like carrying a magnifying lens, a little acid bottle, and a hammer to reveal a rockβs true identity.
We also chat about reliable resources like the Roadside Geology series to help you understand the geology of specific areas. We emphasize the importance of breaking rocks open to see fresh surfaces and narrow down your identification process methodically. Remember, even seasoned geologists take samples back to the lab for further analysis! Finally, we talk about the value of curiosity and the learning process. Whether itβs being the 'annoying student' who asks all the questions or participating in practical exercises like visiting a gravel pit, thereβs a lot to gain from hands-on experience. We encourage you to do some research before your next trip and embrace the joy of discovery. If you have more questions or need help, hit us up at Planet Geo Cast on Gmail or on social media. Happy rock hunting and may your geological inquiries always rock!
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In this episode, we dive into the thrilling hobby of rock hounding, sharing our personal adventures and offering a Rocks and Minerals holiday re-release theme. We'll guide you through the basics of rock hounding, including crucial tips, resources, and a few funny anecdotes about our own experiences in gravel pits, quarries, and even snake-infested areas. Also, don't forget to follow us on social media, download the Camp Geo mobile app, and give us your feedback as we transition into the new year with more listener-focused content. So grab your gear, let's get digging, and marvel at the natural beauty of our planet!
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You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
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In this episode, we're back with the fabulous Dr. Rachel Phillips, also known as Geo Girl on YouTube, diving into part two of our intriguing Q&A session. This time, we cover listener questions about early Earth geology, the moon-forming impact, geochemistry, and much more. Spoiler alert: we journey into the cosmic and tectonic weeds, so grab your scientific hats as we ponder if the moon-forming whammy kickstarted plate tectonics and its broader implications on our planet! The center of our discussion revolves around a burning question: Did the moon-forming impact trigger plate tectonics? From vigorous debates on early Earthβs behavior to the staggering differences between Earth and its 'toxic twin' Venus, we leave no stone unturnedβor unmelted. Dr. Phillips and Jesse examine the evidence, debunk some age-old myths (bye-bye, late heavy bombardment), and think about how a cataclysmic impact billions of years ago might have reset our planetary clock. Oh, and don't get us started on whether Earth or moon rocks are olderβtrust us, it's complicated. As we approach the end of our cosmic conversation, we speculate about how such colossal impacts might have played a role in developing early life on Earth. Did these monumental collisions cook up the perfect conditions for life's early proliferation, or did they serve as the ultimate reset button? Join us on this epic journey through time, magma oceans, and cratered landscapes. And hey, if you have more burning questions or just want to say hello, hit us up on all the social medias at Planet Geo Cast or visit our website planetgeocast.com. Cheers to more geological deep dives in the future!
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Jesse joins forces with Dr. Rachel Phillips, AKA Geo Girl, to tackle viewer questions about Earth's oldest rocks. We cover a wide range of topics, from how Earth's age is calculated using meteorites to the intriguing details of zircon dating. We also discuss the beginnings of plate tectonics, early continents, and the much-debated timeline of Earth's geological history. This in-depth discussion is packed with scientific insights, humorous quips, and plenty of geologic puns to keep you entertained. Don't forget to check out our Camp Geo mobile app for a deep dive into Earth's ancient rocks!
Download the CampGeo app now at this link.
On the app you can get tons of free content, exclusive images, and access to our Geology of National Parks series.
You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
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In this episode of Planet Geo, we share some exciting updates as Chris steps back a bit. Donβt worry; Chris will still join us regularly, but you'll also be hearing more often from fantastic guests like Dr. Rachel Phillips, Dr. Mike Ackerson, and Dr. Josh Davies. Weβre diving deep into the geoscience topics we all love and bringing you insightful interviews with geoscience leaders. Weβre also eager to hear your feedback, so please reach out on our social media or website with your thoughts on the show's future direction.
Before we usher in the new year, we're revisiting some classic episodes, including βRocks and Rules: Putting Things into Order,β where we lay out the foundational principles of geology. From superposition to cross-cutting relations and inclusions, we tackle the basic yet essential concepts that make geology so fascinating. Imagine sorting a giant puzzleβexcept it's with rocks! Whether you're in the field, driving past road cuts, or just curious about those layered rocks on your hike, these principles bring a newfound appreciation for the Earthβs history. We also highlight the invaluable role of index fossils in correlating rock sequences across vast distances, even globally. So, if you're a puzzle enthusiast or a geology newbie looking to deepen your understanding, this episode is for you. Join us as we simplify these scientific principles and show you how they fit into the grand story of our planet's past. And donβt forgetβyour input is vital as we look to make Planet Geo awesome not just for today, but for years to come!
Download the CampGeo app now at this link.
On the app you can get tons of free content, exclusive images, and access to our Geology of National Parks series.
You can also learn the basics of geology at the college level in our FREE CampGeo content series - get learning now!
Like, Subscribe, and leave us a Rating!
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Support us: https://planetgeocast.com/support-us
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Website: https://planetgeocast.com/ - Laat meer zien
