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We've concentrated the history of Planet Earth into one year. Follow the geology podcasts chronologically from the origin of the Earth to the origin of Mankind.
The mineral here is just calcite (even though it’s mostly almost black), but it shows interesting features. Cone-in-cone structures are nest...
Mineral Monday + Tectonic Tuesday. Blue quartz is uncommon and is usually colored by inclusions of unusual minerals like crocidolite, tourma...
Middle section of the 38-inch cross-section Cover This Tectonic Tuesday is also an example of the History of Geology. “The thrust producing...
Epitaxy, from Greek words meaning “upon” or “above” and “ordered arrangement,” in minerals means crystals of one (or the same) mineral growi...
In the far northwest corner of the flat, flat Texas panhandle, extending into New Mexico, there’s a narrow, elongate magnetic low. The inten...
Thule was the far north in Greek and Roman literature, often identified with Scandinavia. Thursday was named after Thor, the Norse god of th...
2019 marks the sesquicentennial of Dmitri Mendeleev’s Periodic Table of the elements, which was not just an effective organizational scheme...
The mineral is artinite, a magnesium carbonate that is an alteration product of high-magnesium serpentinites of the Diablo Range in central...
Fuchsite is a chromium-bearing variety of the mica muscovite, K(Al,Cr) 3 Si 3 O 10 (OH) 2 . Chromium gives the green color to the muscovite....
This is part of the magnetic map of the former Soviet Union. It reveals three continental blocks and their amalgamation to form part of Eura...
Beginning with this post, the blog is "blog only" - no more podcasts, at least not for now. The brownest zones of barite in this example res...
Carbonatites are strange igneous rocks made up mostly of carbonates – common minerals like calcite, calcium carbonate. Igneous rocks that so...
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,...
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 mine...
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...
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 mount...
Today’s episode focuses on one of those wonderful jargon words geologists love to use: Ophiolites. It’s not a contrived term like cactolith...
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...
As the name implies, mud volcanoes are eruptions of mud – not molten rock as in igneous volcanoes. They’re found all around the world, amoun...
Smilodon and dire wolves (drawing by Robert Horsfall, 1913) Running time, 1 hour. File size, 69 megabytes . This is an assembly of the episo...
Morganucodon, a possible early mammal from the Late Triassic. Length about four inches. Drawing by FunkMonk (Michael B. H.) used under Creat...
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...
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 hi...
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 betwee...
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 th...