image: The mid-Ordovician limestone section studied at Kinnekulle in Sweden. This material relates to a paper that appeared in the Sept. 18, 2019, issue of Science Advances, published by AAAS. The paper, by B. Schmitz at Lund University in Lund, Sweden, and colleagues was titled, "An extraterrestrial trigger for the Mid-Ordovician ice age: Dust from the breakup of the L-chondrite parent body." view more
Credit: Credit: Birger Schmitz