Summary. We provide a stratigraphic assessment of the Upper Ordovician through lowermost Silurian of the
Stora Sutarve drillcore from southernmost Gotland. Based on the combined information from lithological characteristics and carbon isotope chemostratigraphy we document a sedimentary succession tentatively ranging from
the Kinnekulle K-bentonite near the Sandbian-Katian stage boundary to the earliest Silurian Motala Formation.
Of particular importance is the identification of the Hirnantian Isotope Carbon Excursion (HICE) that relates to the
latest Ordovician glaciation and associated mass extinction.