Don't Panic Geocast

It's not an exact science.

About the show

John Leeman and Shannon Dulin discuss geoscience and technology weekly for your enjoyment! Features include guests, fun paper Friday selections, product reviews, and banter about recent developments. Shannon is a field geologist who tolerates technology and John is a self-proclaimed nerd that tolerates geologists.


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    Episode 359 - "Standing Around Staring"

    March 17th, 2023  |  37 mins 24 secs

    We've missed you - but we have a good reason! John has been moving! Again!

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    Episode 358 - "Put a pin in it" Surveillance Balloons

    February 24th, 2023  |  57 mins 11 secs

    There's been a lot of buzz about the PRC surveillance balloon, so we unpack the history of using balloons for science and for military.

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    Episode 357 - "Looks like the iron throne"

    February 10th, 2023  |  42 mins 44 secs

    Giant crystal in caves sounds more like a plot twist than a geological phenomena, but this week we learn how the Naica Mine crystals were formed! Also can you 3D print rocks?

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    Episode 356 - "They'll find me laying in a graben"

    February 3rd, 2023  |  38 mins 33 secs

    This week we talk about basin and range topography, horsts, grabens, and more! Also how similar is your mouth bacteria to someone you kissed?

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    Episode 355 - "Best First Week of Class Ever"

    January 27th, 2023  |  52 mins 54 secs

    This week John and Shannon discuss some mysterious rocks whose extraterrestrial origin is still debated and if growing a beard is a good defense against a punch.

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    Episode 354 - "That's Gneiss"

    January 20th, 2023  |  33 mins 13 secs

    This week John is on travel so we talk about the geology of New York City and how it shaped the city so many love.

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    Episode 353 - "We Didn't Do So Well"

    January 13th, 2023  |  1 hr 13 mins

    We look back at 2022 and forward to 2023 in the class resolutions/recap show.

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    Episode 352 - "Why are things so heavy in the future?"

    December 23rd, 2022  |  51 mins 1 sec

    Shannon went to a workshop on determining the provenance of sediments using heavy elements, optical microscopes, and Raman spectra! Also, does your dog lie when they urine mark? Studies say yes!

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    Episode 351 - "Our Favorite Things"

    December 16th, 2022  |  1 hr 12 mins

    2022 flew past, so this week John and Shannon review their favorite things, experiences, classes, and more of 2022. Everything from bee keeping to kitchen appliances to multimeters to books!

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    Episode 350 - "Borehole to Hell"

    December 2nd, 2022  |  47 mins 41 secs

    How deep have we actually drilled into the Earth? Turns out, not very far, just 12,262 metres (40,230 ft) or about 0.3% of the way to the center of the Earth. We talk about the challenges of this feat and about potty training cows.

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    Episode 349 - "That Sounds Heavy" Tech Replacement

    November 18th, 2022  |  56 mins 48 secs

    Letting go is hard. This week we talk about when to let go of old tech and when to hold on. We wrap up with a fun paper about the spherical cow and pitting the engineers against the physics crowd.

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    Episode 348 - "Hot Juicy Magma"

    November 6th, 2022  |  42 mins 31 secs

    This week it's all about geologic dikes and how they form. Checkout these injection features and one of our favorite fun papers yet!

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    Episode 347 - "Tiny Crusty Rocks"

    November 4th, 2022  |  40 mins 57 secs

    It's a bird, it's a plane, it's a UFO.... or maybe just a meteorite. This week we talk about meteorites and how they are classified.

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    Episode 346 - "They Haven't Broke"

    October 21st, 2022  |  49 mins 2 secs

    This week we recap Shannon's travel to GSA and John's travel to Europe before diving into what shaped knobs are best for different applications in an award winning Fun Paper Friday!

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    Episode 345 - "3rd Hoodoo on the Left"

    October 7th, 2022  |  34 mins 58 secs

    This week its all about the badlands and how they got to be so bad!

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    Episode 344 - "Pre-Cognated"

    September 30th, 2022  |  1 hr 6 mins

    This week we're talking about how we learn new things as we get further in our careers and how we're trying to stay current with our fields.