In December 2021, a team of paleontologists published data suggesting that the asteroid impact that ended the reign of dinosaurs could be pinned down to a season—springtime, 66 million years ago—thanks to an analysis of fossilized fish remains at a famous site in North Dakota.

Now, a different group of researchers is accusing the former group of faking their data; the journal that published the research has added an editor’s note to the paper saying the data is under review.

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The situation was first reported by the publication Science last month. Melanie During, a paleontologist at Uppsala University in Sweden, submitted a paper for publication in the journal Nature in June 2021. The paper’s chief finding was that the large asteroid that slammed into Earth at the end of the Cretaceous struck in spring, a conclusion reached by studying fossilized fish found in North Dakota.

Read more: Gizmodo