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.


  • Poster Image

    Episode 339 - "Museum with a crater out back"

    August 19th, 2022  |  44 mins 26 secs

    This week we talk about meteor crater and about the little blue pill.... or red pill.

  • Poster Image

    Episode 338 - "GEARS 2022"

    August 12th, 2022  |  1 hr 1 min

    The GEARS workshop just happened again, hear what we saw, what the students did and more!

  • Poster Image

    Episode 337 - "Air Guitar"

    July 22nd, 2022  |  28 mins 56 secs

    The summer shorts musical theme continues with sferics and another paper from the BMJ Christmas edition!

  • Poster Image

    Episode 336 - "Chopstick Breaking Sound"

    July 15th, 2022  |  41 mins 18 secs

    This week we talk about sounds from the Aurora and strange atmospheric conditions that create it.

  • Poster Image

    Episode 335 - "Fish with a Ray Gun"

    July 1st, 2022  |  26 mins 19 secs

    We stick with our musical theme for summer shorts and talk about singing ice! Also why is it important to be stupid as a scientist?

  • Poster Image

    Episode 334 - "Rock Concert"

    June 24th, 2022  |  30 mins 22 secs

    Our musical themed summer shorts continue with the phenomena of ringing rocks! Also, can math get you out of that failure to stop ticket?

  • Poster Image

    Episode 333 - "Sandphony"

    June 10th, 2022  |  25 mins 50 secs

    This week we talk about singing sands and how on Earth dunes make noise.

  • Poster Image

    Episode 332 - "Caliche"

    June 3rd, 2022  |  26 mins 52 secs

    We kick off summer shorts by talking about caliche and ways it makes new field geologists crazy!

  • Poster Image


    May 20th, 2022  |  1 hr 33 mins

    This week Dr. Ryan May joins us to talk about life as a scientific software developer and his career path from radars to radiosondes and more!

  • Poster Image

    Episode 330 - "Blamo"

    May 13th, 2022  |  1 hr 5 mins

    Last week we talked about material hardness, but what about when materials crack and fracture? This week we talk about fracture toughness.

  • Poster Image

    Episode 329 - "Granite Annulus"

    May 6th, 2022  |  1 hr 3 mins

    What makes a material hard? What makes it tough? Are they the same thing?

  • Poster Image

    Episode 328 - "Bouma"

    April 22nd, 2022  |  56 mins 23 secs

    This week we talk about the famous Bouma sequence in more detail and look at where the world of quantum physics could have been in a parallel universe.

  • Poster Image

    Episode 327 - "Delta Tesseract"

    April 15th, 2022  |  50 mins 20 secs

    What happens when rivers meet oceans? All kinds of fun sedimentary processes that build deltas. Learn more this week along with a discussion of one man's favorite boulders.

  • Poster Image

    Episode 326 - "The Pinky Raise"

    April 8th, 2022  |  46 mins 12 secs

    We talk about conglomerates, how they form, how we classify them, and more. Then we talk about distribution of hook worms in poop.

  • Poster Image

    Episode 325 - "It turns to mud"

    April 1st, 2022  |  55 mins 40 secs

    This week we talk about the Colorado River and what Shannon was doing back out in the field last week.

  • Poster Image

    Episode 324 - "Nanoknots"

    March 25th, 2022  |  43 mins 16 secs

    Hot spots are a hot topic and nowhere more so than Hawaii. We weigh in this week.