1.2 Billion Years of Rock is Missing; The Mystery of the Great Unconformity

In the Grand Canyon, there is seemingly 1.2 billion years of rock and thus geologic history missing. As, 520 million year old rock directly overlies 1.7 billion year old rock with nothing inbetween the two. This is what is referred to as the “Great Unconformity“, and happens to also occur in states such as Colorado, Nevada, and New Mexico. This video will discuss one possible reasoning behind why 26% of Earth’s geologic history is missing across a vast area. Thumbnail Photo Credit: Toni Rozinek, USGS, U.S. Geological Survey, Public Domain, This image was then color enhanced, overlaid with text, and overlaid with GeologyHub made graphics (the GeologyHub logo and the image border). If you would like to support this channel, consider using one of the following links: (Patreon: ) (YouTube membership: ) (Gemstone & Mineral Etsy store: ) (GeologyHub Merch Etsy store: ) 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 tccatron@ 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: Public Domain: CC BY 2.0: Sources/Citations: [1] U.S. Geological Survey 0:00 The Grand Canyon 0:32 The Great Unconformity 2:46 Ancient Earth 3:05 Cryogenian Period 3:35 Slushball Earth 4:44 Conclusion