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 375: Garnets||Garnet is the birthstone for January, but there really isn’t a single mineral named ‘garnet.’ It’s a group of at least 15 minerals of differing chemistry, but only six are common. They are three aluminosilicates combined with iron, magnesium, o||1/8/2016||Free||View in iTunes|
||CleanThe Cenozoic Episodes||Running time 3 hours We are up to the Cenozoic Era in the monthly episodes. This one combines the 31 episodes from December 2014, covering the Cenozoic, into one episode, and it completes the packaging of each month of episodes from the original series||11/28/2015||Free||View in iTunes|
||CleanThe Cretaceous Episodes||Running time 2 hours 30 minutes We are up to the Cretaceous Period of the Mesozoic Era in the monthly episodes. This one combines the 30 episodes from November 2014, covering the Cretaceous, into one episode. As usual for this monthly compilation, I’||11/24/2015||Free||View in iTunes|
||CleanEpisode 374. Twins||This week, our topic is twins. Twinned crystals. When two, or sometimes more, crystals of the same mineral share volumes or surfaces within the crystal lattice, they grow together in interesting ways. One common kind of twin is essentially a reflection||11/24/2015||Free||View in iTunes|
||CleanThe Jurassic Episodes||Running time 2 hours 5 minutes We are up to the Jurassic Period of the Mesozoic Era in the monthly episodes. This one combines the 31 episodes from October 2014, covering the Jurassic, into one episode. As usual, I’ve left the references to specific||9/28/2015||Free||View in iTunes|
||CleanThe Triassic Episodes||Running time 1 hour 45 minutes Shonisaurus from the Triassic of Nevada. Maximum length, 49 feet. Drawing by Nobu Tamura http://spinops.blogspot.com used under Creative Commons license.We are up to the Triassic Period of the Mesozoic Era in the month||8/22/2015||Free||View in iTunes|
||CleanEpisode 373. A walk to Branham Lakes||Upper Branham LakeToday’s episode will be a little different from what you are used to. I’m going to try to give some of the story of the Precambrian here in southwestern Montana, but I’ll do it in the context of a little hike I did yesterday to||8/15/2015||Free||View in iTunes|
||CleanEpisode 372 Satellite-derived gravity||Welcome to the History of the Earth, which has now evolved into a general podcast covering all things geological. I’m your host, geologist Dick Gibson. Today I’m going to talk a bit about one of my specialties, interpretation of gravity data. Speci||7/29/2015||Free||View in iTunes|
||CleanThe Permian Episodes||Running time 2 hours We are up to the Permian Period of the Paleozoic Era in the monthly episodes. This one combines the 31 episodes from August 2014, covering the Permian, into one two-hour episode. As usual, I’ve left the references to specific date||7/24/2015||Free||View in iTunes|
||CleanThe Pennsylvanian Episodes||Running time 1 hour 45 minutes This episode is the seventh monthly package that combines the daily episodes for July 2014, covering the Pennsylvanian Period of the Paleozoic Era. As with the Mississippian, I apologize for not getting this assemblage don||7/12/2015||Free||View in iTunes|
||CleanThe Mississippian Episodes||Running time 1 hour 30 minutes This episode is the sixth monthly package that combines the daily episodes for June 2014, covering the Mississippian Period of the Paleozoic Era. I apologize for not getting this assemblage done on time – my summer has||7/7/2015||Free||View in iTunes|
||CleanEpisode 371: Listener Questions||Today for Episode number 371 I’m going to try to address some of the questions I've received on the blog or through the podcast. A fair number of these were addressed in comments here on the blog, and I usually tried to answer them here, but listener||5/8/2015||Free||View in iTunes|
||CleanThe Devonian Episodes||Running time 2 hours 20 minutes This episode is the fifth monthly package that combines the daily episodes for May 2014, covering the Devonian Period of the Paleozoic Era. As usual, I’ve left the references to specific dates in the podcast so that yo||4/30/2015||Free||View in iTunes|
||CleanThe Silurian Episodes||Running time 2 hours This episode is the fourth monthly package in the History of the Earth Calendar. It combines the daily episodes for April 2014, covering the Silurian Period of the Paleozoic Era. As usual, I've left the references to specific dates||4/1/2015||Free||View in iTunes|
||CleanEpisode 370: Pseudomorphs||Malachite pseudomorph after cuprite showing octagon and dodecahedron faces. From Chessy, France. Specimen is just over 1 cm in maximum dimension. Photo by Richard I. Gibson.Today for Mineral Monday my special guest is Kyle Eastman, mineral collector an||3/23/2015||Free||View in iTunes|
||CleanThe Mineral Episodes||This episode is a package containing all the previous episodes of the podcast related to minerals and mineral deposits. There are 16 of them, and the running time is about an hour and thirty minutes. Thanks very much for your interest. —Richard I. Gi||3/12/2015||Free||View in iTunes|
||CleanThe Ordovician Episodes||Running time 2 hours 15 minutes This episode is the third monthly package of the History of the Earth calendar. It combines the daily episodes for March 2014, covering the Ordovician Period of the Paleozoic Era. You’ll find that I’ve left the refer||2/25/2015||Free||View in iTunes|
||CleanEpisode 369: Gallium||On my What Things Are Made of blog, by far the most popular post is one on the element gallium. I don’t know why this is so, unless there are a lot of middle schools assigning homework on gallium. So I thought I’d update that post here for the podc||2/14/2015||Free||View in iTunes|
||CleanThe Cambrian Episodes||Running time 2 hours 10 minutes For 2014, the podcast consisted of daily productions averaging about 5 minutes each. The individual episodes for each month are now being assembled into packages for each month, representing various spans of time in the||2/1/2015||Free||View in iTunes|
||CleanThe Oily Episodes from 2014||My friend Larry Smith, a geology professor at Montana Tech here in Butte, Montana, suggested that I assemble the podcasts from 2014 into thematic packages as well as the month by month packages, which is ongoing. I thought that was a good enough idea t||1/29/2015||Free||View in iTunes|
||CleanEpisode 368: Alaska, 1898||Today’s episode is from my book, What Things Are Made Of and the chapter that includes gold. THE LAST GREAT GOLD RUSH began in August 1896, when prospector George Washington Carmack and his two Indian companions, Skookum Jim and Tagish Charlie, found||1/27/2015||Free||View in iTunes|
||CleanEpisode 367 – Kidney stones||Today I want to talk about some of the youngest minerals on earth – kidney stones. Some might argue whether these should be considered minerals at all, since part of the definition of a mineral is other than man-made, but that’s usually phrased as||1/20/2015||Free||View in iTunes|
||CleanThe Precambrian - the daily episodes from 2014 combined||For 2014, the podcast consisted of daily productions averaging about 5 minutes each. The individual episodes for each month are now being assembled into packages for each month, representing various spans of time in the history of the earth. This episo||1/16/2015||Free||View in iTunes|
||CleanDecember 31. The 6th Extinction||So we’ve made it to the end of our geological year, covering 4.6 billion years of geologic time. 366 episodes, close to 180,000 words and a total of about 25 or 30 hours of programs. I hope you’ve enjoyed it! The podcast will not end, but the struc||12/31/2014||Free||View in iTunes|
||CleanDecember 30. Modern Plate Tectonics||Through the year, we’ve talked about events that broke apart and combined the various tectonic plates on the earth, but today, as we’ve almost reached the present, I wanted to just summarize the way things are today. First, I know I talked repeat||12/30/2014||Free||View in iTunes|
Great to listen to
I have enjoyed this interesting journey through time!
A great daily walk through geologic time. Enjoy it.
Well done, concise. I just wish all the old episodes were available on itunes. I found them on the blog, but it's easier to download from itunes.