Figure 1

(A) Map of southern Sweden showing the distribution of Phanerozoic rocks and the Transscandinavian Igneous Belt (TIB)¹⁷. (B) Schematic map of Öland showing location of sections discussed in the text: 1, Bruddesta; 2, Degerhamn; 3, Grönhögen-2015 borehole. Isopaches for the Alum Shale Formation after²⁴.