Lingulate brachiopods from the Cambrian—Ordovician boundary beds in Sweden

Lingulate brachiopods are described from the so-called ‘Obolus’ beds in the Siljan district, South Bothnian submarine district, and on the island of Öland, Sweden. The fauna includes Ungula inornata, U. ingrica, Schmidtites celatus, Oepikites sp., Ceratreta tanneri and Keyserlingia reversa that are well-known in the Upper Cambrian of the northern East Baltic (Estonia and Ingria); most examined sections also include species of probable late Tremadoc to early Arenig age. Lingulate and conodont-based correlation with the Ülgase and Saka sections in Estonia indicates that the Swedish ‘Obolus’ beds were formed during several phases of redeposition in the time interval from the Late Cambrian to early Arenig.