History of the Earth
By Richard I. Gibson
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366 snapshots of earth history in the form of a perpetual calendar, with daily episodes for 2014 and weekly thereafter. Find all the posts at http://historyoftheearthcalendar.blogspot.com
||CleanEpisode 397 Carbonatites||Carbonatites are strange igneous rocks made up mostly of carbonates – common minerals like calcite, calcium carbonate. Igneous rocks that solidify from molten magma usually are high-temperature rocks containing lots of silicon which results in lots o||4/30/2018||Free||View in iTunes|
||CleanEpisode 396 Turbidity currents||As near as I can tell in the original daily series in 2014, I never addressed the topic of turbidity currents and their sedimentary product, turbidites. But they account for the distribution of vast quantities of sediment on continental shelves and slo||4/17/2018||Free||View in iTunes|
||CleanEpisode 395 Connections||This episode is about some of the interesting connections that arise in science. We’ll start with me and my first professional job as a mineralogist analyzing kidney stones. My mineralogy professor at Indiana University, Carl Beck, died unexpectedly,||4/10/2018||Free||View in iTunes|
||CleanEpisode 394 The Mangrullo Formation of Uruguay||Today we’re going back about 280 million years, to what is now Uruguay in South America. 280 million years ago puts us in the early part of the Permian Period. Gondwana, the huge southern continent, was in the process of colliding with North America||4/3/2018||Free||View in iTunes|
||CleanEpisode 393 The Mountains of the Moon||Today we’re going to the Mountains of the Moon – but not those on the moon itself. We’re going to central Africa. There isn’t really a mountain range specifically named the Mountains of the Moon. The ancients, from Egyptians to Greeks, imagined||3/27/2018||Free||View in iTunes|
||CleanEpisode 392 Ophiolites||Today’s episode focuses on one of those wonderful jargon words geologists love to use: Ophiolites. It’s not a contrived term like cactolith nor some really obscure mineral like pararammelsbergite. Ophiolites are actually really important to our und||3/20/2018||Free||View in iTunes|
||CleanEpisode 391 Valles Marineris||In today's episode we’re going to space. Specifically, Mars. You didn’t really think that earth science is really limited to the earth, did you? Our topic today will be the Valles Marineris. The Valles Marineris is a long series of canyons east of||3/13/2018||Free||View in iTunes|
||CleanEpisode 390 Mud Volcanoes||As the name implies, mud volcanoes are eruptions of mud – not molten rock as in igneous volcanoes. They’re found all around the world, amounting to about a thousand in total number known. The one thing they have in common is hot or at least warm||3/6/2018||Free||View in iTunes|
||CleanCretaceous and Cenozoic Vertebrates compilation||Smilodon and dire wolves (drawing by Robert Horsfall, 1913) Running time, 1 hour. File size, 69 megabytes. This is an assembly of the episodes in the original series from 2014 that are about Cretaceous and Cenozoic vertebrates. I’ve left the referenc||3/4/2018||Free||View in iTunes|
||CleanTriassic and Jurassic Vertebrates compilation||Morganucodon, a possible early mammal from the Late Triassic. Length about four inches.Drawing by FunkMonk (Michael B. H.) used under Creative Commons license. Running time, 1 hour. File size, 68 megabytes. This is an assembly of the episodes in th||3/4/2018||Free||View in iTunes|
||CleanEpisode 389 Vanadium||Vanadium is a metal, and by far its greatest use is in steel alloys, where tiny amounts of vanadium improve steel’s hardness, toughness, and wear resistance, especially at extreme temperatures. As I reported in my book What Things Are Made Of, more t||2/27/2018||Free||View in iTunes|
||CleanEpisode 388 Folds in Algeria||You may have seen some of the spectacular images of the earth in southern Algeria, curves and colors like some Picasso in the opposite of his cubist period. If you haven’t, check out the one from NASA, below. The ovals and swirls, with their concen||2/20/2018||Free||View in iTunes|
||CleanEpisode 385 The Magnetic Field Anomaly||Most of my career was in analyzing features of the earth’s gravity and magnetic fields, to infer geologic structures for oil exploration. But that doesn’t mean I really understand the whole earth’s fields – and for some aspects of it, neither d||2/15/2018||Free||View in iTunes|
||CleanEpisode 387 Geology of Beer||It isn’t true that all geologists drink beer. But many do, and I’m one of them. Today I’m going to talk about the intimate connection between geology and beer. Beer is mostly water, and water chemistry has everything to do with beer styles. And w||2/13/2018||Free||View in iTunes|
||CleanPaleozoic Vertebrates compilation||Ganoid fish from an old textbook (public domain)Running time, 1 hour. File size, 70 megabytes. This is an assembly of the 15 episodes in the original series from 2014 that are about Paleozoic vertebrates. I’ve left the references to specific dates in||2/11/2018||Free||View in iTunes|
||CleanEpisode 386 Dynamic Topography||What is dynamic topography? Well, it depends on who you ask. Dynamic topography is similar to other terms, like uplift, that have been used in so many different ways that you really have to look at the document you’re reading to understand what the a||2/6/2018||Free||View in iTunes|
||CleanEpisode 384 Kyanite||Today’s topic is three minerals with the same chemical formula: Kyanite, Andalusite, and Sillimanite. How can three things with the exact same chemical formula, Al2SiO5, be different minerals? Many of you probably recall that besides a distinct che||2/1/2018||Free||View in iTunes|
||CleanEpisode 383 Himalayas, Catskills, and more||For today’s episode of the podcast I’m introducing you to Dr. Petr Yakovlev, a friend and geologist here in Butte at the Montana Bureau of Mines and Geology. Petr will be doing occasional guest episodes to give you all a break from my voice, as wel||1/16/2018||Free||View in iTunes|
||CleanEpisode 382 The Riversleigh Lagerstätte||Today’s Episode takes us to Australia, the home of the Riversleigh Lagerstätte. Lagerstätten, you may recall, are fossil assemblages that typically have extraordinary diversity as well as extraordinary preservation. The Riversleigh Lagerstätte fit||1/9/2018||Free||View in iTunes|
||CleanEpisode 381 Zealandia||Today for episode 381, we’re going to Zealandia. No, it’s not a quirky TV show modeled after Portlandia. It’s the 7th largest continent on earth. We’re not talking continents in the geographic sense, really large land masses like Africa and Sou||1/2/2018||Free||View in iTunes|
||CleanEpisode 380 Makoshika State Park, Montana||The badlands at Makoshika State Park are in Montana, and so am I, but Montana’s big. The park is just outside of Glendive, almost at the eastern border of the state. It took me and my friend about seven hours to get there from Butte, but it was worth||12/26/2017||Free||View in iTunes|
||CleanEpisode 379 Gondwana Glaciation||Today’s episode, number 379, is about glaciers in what is now the Sahara Desert, and we’re going back 340 million years, to the Mississippian or Early Carboniferous Period of the Paleozoic Era. In the original daily episodes of this podcast back in||12/19/2017||Free||View in iTunes|
||CleanEpisode 378: Pegmatites||If you’ve listened to this series for any length of time, you know that geologists, like most scientists, are fond of jargon. They use specialized words as shortcuts for particular meanings, like ‘gabbro,’ which is easier to say than “a coarse-||12/11/2017||Free||View in iTunes|
||CleanEpisode 377: The Tepuis||Today’s topic for Episode 377, the Tepuis of South America, was suggested long ago by a listener. Photo of Mt. Roraima by Jeff Johnson, used under Creative Commons Attribution-Share Alike 3.0 Unported license.Transcript: The Tepuis a||12/4/2017||Free||View in iTunes|
||CleanEpisode 376: US Mineral Dependency||Welcome to the History of the Earth podcast where we discuss all things geological. I’m your host, geologist Dick Gibson. There’s been a long hiatus in my production of this podcast, and I hope to rectify that with some new episodes. Today’s||11/27/2017||Free||View in iTunes|
History of the earth
Really do enjoy your show, I put it on one and a half speed as I am a fast listener.
Fascinating journey through geologic time.
A straightforward, thorough, and incredibly informative podcast delivered with a steady tenor and soothing theme music.
Glad to see you've returned. I really enjoy learning about my environment and how it got to be where it is today.