Age of the Kalana Lagerstätte, early Silurian, EstoniaMännik, Peep; Tinn, Oive; Loydell, David, K.; Ainsaar, L.Estonian journal of earth sciences2016 / p. 105-114 : ill https://doi.org/10.3176/earth.2016.10 https://artiklid.elnet.ee/record=b2778946*est