In the United Kingdom's Shetland Islands, there is a probable large impact crater which formed part of a major bay. Known as the St Magnus Bay Crater, it likely initiated the formation of the namesake bay where the structure comprises the northern three-fifths of it. Today's video assumes that this structure is indeed an impact crater, and discusses what effects the original asteroid impact which formed it had. Thumbnail Photo Credit: Google Earth, Image IBCAO, Image Landsat / Copernicus, Image © 2025 Airbus, Data SIO, NOAA, U.S. Navy, NGA, GEBCO. This image was overlaid with text, and then overlaid with GeologyHub made graphics (the image border & the GeologyHub logo). Estimates on asteroid diameter, velocity, initial crater depth, tnt energy equivalent, and effects from the impact in this video were sourced using the calculator at https://impact.ese.ic.ac.uk/ImpactEarth/ImpactEffects/, which was used with permission. If you would like to support this channel, consider using one of the following links: (Patreon: http://patreon.com/geologyhub) (YouTube membership: https://www.youtube.com/channel/UCYeGh5VML5XPr5jYnzh3J6g/join) (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. Various licenses used in sections of this video (not the entire video, this video as a whole does not completely fall under one of these licenses) and/or in this video's thumbnail image (and this list does not include every license used in this video and/or thumbnail image): CC BY 2.0: https://creativecommons.org/licenses/by/2.0/legalcode CC BY 4.0: https://creativecommons.org/licenses/by/4.0/legalcode Sources/Citations: [1] Sharp, A.W. St. Magnus Bay, Shetland: A probable British meteorite crater of large size. The Moon 2, 144–156 (1970). https://doi.org/10.1007/BF00561958 [2] Collins, Gareth & Lynch, Elliot & McAdam, Ronan & Davison, Thomas. (2017). A numerical assessment of simple airblast models of impact airbursts. Meteoritics & Planetary Science. 52. 10.1111/maps.12873., CC BY 4.0. 0:00 Bays 0:43 Scotland Impact Crater 1:44 Crater Age Range 2:36 H Chondrite? 3:00 Impact Effects