--- description: Rather than one alone, the researchers found evidence that both forces together resulted in dinosaur extinction. title: Asteroid and Volcanic Eruptions Both Led to End of Dinosaurs, Study Says image: https://static.time.com/v3/assets/bltea6093859af6183b/blt87355a9b5d578670/698866aa8e060136b4462abe/volcano.jpg?branch=production&width=3840&quality=75&auto=webp&crop=16:9 ---  * [Science](/section/science/) ## Science Update your preferences in [Account Settings](/account/preferences/) Close * [animals](/tag/animals/) ## animals Update your preferences in [Account Settings](/account/preferences/) Close # Study Proposes Asteroid and Volcanic Eruptions Both Caused Dinosaur Extinction  by [Julia Zorthian](/author/julia-zorthian/)  ## Julia Zorthian Update your preferences in [Account Settings](/account/preferences/) Close Oct 2, 2015 3:34 PM CUT  Molten lava erupts from Sakurajima, Kagoshima, Japan Molten lava erupts from Sakurajima, Kagoshima, JapanGetty Images  by [Julia Zorthian](/author/julia-zorthian/)  ## Julia Zorthian Update your preferences in [Account Settings](/account/preferences/) Close Oct 2, 2015 3:34 PM CUT A [new study](http://www.sciencemag.org/content/350/6256/76 "undefined") examining volcanic eruptions and the infamous dinosaur-killing asteroid [proposes a compromise](http://news.yahoo.com/double-trouble-asteroid-volcanoes-implicated-dinosaur-doom-233850490.html "undefined") in which both were responsible for the great extinction that occurred about 65 million years ago. In the study, published in the journal _Science_, Geologists [examined the timing](http://news.berkeley.edu/2015/10/01/asteroid-impact-volcanism-were-one-two-punch-for-dinosaurs/ "undefined") of the already well-researched volcanic activity in the Deccan Traps in western India, and found that those eruptions occurred within 50,000 years of the asteroid hit—a pretty narrow window in geologic time. The seismic punch of the impact may have accelerated the speed of the eruptions, making it not only likely that both events had a hand in the dinosaurs’ downfall, but difficult to tease out which, if either, was more to blame. “The debate has been contentious,” [said](http://news.yahoo.com/double-trouble-asteroid-volcanoes-implicated-dinosaur-doom-233850490.html "undefined") U.C. Berkeley geologist Paul Renne, who led the study. “Now it’s time to stop dismissing one cause or the other. They clearly happened at the same time and both contributed.” The researchers are not the first to try to determine the age of the volcanic samples in the Deccan traps, but they used a new technique that analyzed [700 rock samples](http://www.nytimes.com/2015/10/06/science/study-finds-asteroid-ahead-of-dinosaur-extinction-accelerated-volcanoes.html?%5Fr=0 "undefined") for decay rates of two isotopes of argon, which helped them date the formation more precisely than ever before. Over the course of 420,000 years following the asteroid, they concluded, the Deccan eruptions produced enough lava to cover the continental U.S. with a molten, 600-ft-deep (183 m) ocean. But U.C. Berkeley geophysicist Mark Richards offered words of consolation for those bemoaning the fate of the dinosaurs. “We as humans wouldn’t be here if the dinosaurs had not been wiped out,” he told Reuters, quickly ending any imaginings of a world cohabited by the extinct creatures and our own species. \[[Reuters](http://news.yahoo.com/double-trouble-asteroid-volcanoes-implicated-dinosaur-doom-233850490.html "undefined")\] ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/4059335/asteroid-volcano-dinosaur-extinction/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/4059335/asteroid-volcano-dinosaur-extinction/"},"headline":"Study Proposes Asteroid and Volcanic Eruptions Both Caused Dinosaur Extinction","datePublished":"2015-10-02T15:34:28.000Z","dateModified":"2026-02-22T11:28:30.713Z","description":"A compromise in the decades-long debate.","url":"https://time.com/4059335/asteroid-volcano-dinosaur-extinction/","keywords":["animals","dinosaurs"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt87355a9b5d578670/698866aa8e060136b4462abe/volcano.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Julia Zorthian","jobTitle":null,"url":"https://time.com/author/julia-zorthian/"}],"articleSection":"Science","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt87355a9b5d578670/698866aa8e060136b4462abe/volcano.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"volcano","caption":"volcano","creditText":"Getty Images","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/science/","name":"Science"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/animals/","name":"animals"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/4059335/asteroid-volcano-dinosaur-extinction/","name":"Study Proposes Asteroid and Volcanic Eruptions Both Caused Dinosaur Extinction"}}]}] ```