Latest Ordovician age of the Spinachitina fragilis Chitinozoan Biozone in BaltoscandiaNõlvak, Jaak; Liang, Yan; Hints, OlleEstonian journal of earth sciences2023 / p. 82-85 : ill https://doi.org/10.3176/earth.2023.51 Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS