The article from Science Daily= https://www.sciencedaily.com/releases/2021/01/210105130123.htm
The Source Paper= https://www.cambridge.org/core/journals/paleobiology/article/cretaceouspaleogene-plant-extinction-and-recovery-in-patagonia/94645848E3BE16AC818320248C725734 (I found this paper to be quite well written, and would recommend you read it too.)