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A Geologic Mystery in Madagascar; Solved at Last?

In Madagascar is a strange massive natural ring in the ground which measures nearly 10 miles or 16 kilometers across. This geologic oddity is not an impact crater or a caldera, but instead something completely different. This is the story of this still unnamed feature which formed due to its association with an ancient massive outpouring of lava known as a flood basalt. Thumbnail Photo Credit: Google Earth, Image © 2024 Airbus. This image was overlaid with text and then overlaid with GeologyHub made graphics (the image border, the orange dashed line to indicate the feature's rim, & the GeologyHub logo). NOTE: Collecting is NOT allowed, and neither is trespassing at Buell Park (in Arizona) which is ALL private property! Please do not trespass onto the kimberlite pipe in Arizona (which contains no diamonds) referenced in this video. If you would like to support this channel, consider using one of the following links: (Patreon:   / geologyhub  ) (YouTube membership:    / @geologyhub  ) (Gemstone & Mineral Etsy store: http://prospectingarizona.etsy.com) (GeologyHub Merch Etsy store: http://geologyhub.etsy.com) Google Earth imagery used in this video: ©Google & Data Providers This video is protected under "fair use". If you see an image and/or video which is your own in this video, and/or think my discussion of a scientific paper (and/or discussion/mentioning of the data/information within a scientific paper) does not fall under the fair use doctrine, and wish for it to be censored or removed, contact me by email at [email protected] and I will make the necessary changes. Sources/Citations: [1] MELLUSO, LEONE & Morra, Vincenzo & BROTZU, PIETRO & Tommasini, Simone & Renna, Maria & DUNCAN, ROBERT & Franciosi, L. & D'AMELIO, FOSCO. (2005). Geochronology and Petrogenesis of the Cretaceous Antampombato-Ambatovy Complex and Associated Dyke Swarm, Madagascar. Journal of Petrology. 46. 10.1093/petrology/egi044. [2] White, S. M., J. A. Crisp, and F. J. Spera (2006), Long-term volumetric eruption rates and magma budgets, Geochem. Geophys. Geosyst., 7, Q03010, doi:10.1029/2005GC001002. 0:00 A Geologic Mystery 1:01 Ruling out Candidates 2:28 150 Million Years Ago 2:56 Flood Basalt 3:46 Doming