https://youtu.be/p6m4iRqTOT8

Ancient oxygen flood fueled deep ocean life, jawed fish evolution. This video is intended for geologists and Earth science enthusiasts. Timestamp 0:00 Intro 1:32 The oxygen in our oceans 2:56 Isotopic analysis of selenium 4:14 Two oxygenation events 5:51 Where did all this oxygen come from? 7:46 Dead zones in the current oceans 9:21 Introduction to Valls Geoconsultant channel 9:33 Cómo leer el vídeo en Español Discover how an ancient oxygen flood profoundly impacted deep ocean life and drove jawed fish evolution. This video explores the Middle Devonian marine life revolution, detailing how Earth's first forests enabled the permanent oxygenation of deep-sea habitats and spurred animal diversification. Join us as we delve into new research from co-lead author Michael Kipp, assistant professor at Duke University, and the University of Washington team, published in PNAS, which challenges previous understandings of ocean oxygen levels and their role in evolutionary shifts. Scientists once thought deep-ocean oxygenation was a single event at the start of the Paleozoic Era, but newer studies, particularly those utilizing selenium isotopes from ancient sedimentary rocks, reveal a stepwise pattern. We'll examine how these rock clues from the seafloor indicate two major oxygenation events, with the lasting episode around 393-382 million years ago during the Middle Devonian making deep waters habitable for gnathostomes and other ancient marine animals, allowing them to grow larger and diversify. This critical event in paleobiology and marine biology directly correlates with the rise of woody plants, which pumped more oxygen into the atmosphere and subsequently into deeper ocean environments. Understanding these deep-sea animals and marine ecosystems of the ancient past provides critical lessons for today, as modern ocean deoxygenation poses a significant threat to the balance of animal life established nearly 400 million years ago. The bridge between Academy and Industry! P. Geo. Ricardo A Valls, M. Sc. and Geo Gadfly Valls Geoconsultant ORCID ID- https://orcid.org/0000-0002-5421-0914 Scopus Author ID: 7003369619/35335510700 ResearcherID: S-6604-2018 If you like this content, please "buy me a coffee" https://www.buymeacoffee.com/goldendroplets #VallsGeoConsultant #OceanOxygenation #PaleozoicGeology #JawedFishEvolution