During the Silurian, Baltica was positioned at a palaeolatitude between the equator and 30°S ( Scotese 2001; Verniers et al. 2008; Torsvik et al. 2017), and the BB constituted a distal foredeep basin of the Pomeranian Caledonides—the orogen formed as a result of the Eastern Avalonia—Baltica progressive propagation of the Caledonian orogenic front was .