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Abstract
Data are presented for the writer's interpretation in 1938 and 1960 of the stratigraphy within the basal Silurian of Gotland. The stratigraphical gap then suggested at the Ordovician-Silurian boundary is shown now to be connected with events within the Caledonian geosynclinc and the cratonic Balto-Scandia. i.e. a Taconian phase of orogeny (= Ekne phase according to Vogt 1928) and epeirogenic movements (uplifts), respectively. Studies of Upper Ordovician and Lower Silurian sediments have proved the existence of a sand-producing land situated east of the Jemtland Palaeozoic area and north of Estonia and Gotland. Within the Baltic the appearance in the sequence of the boundary between Ordovician and Silurian is compared with that between Cambrian and Ordovician.
