Description or a new section in the lowermost Upper Ordovician Slandrom limestone exposed by excavations at Gulleråsen, Siljan district. The lower part of the Slandrom limestone, the fauna of which was previously almost unknown, contains i.a. Chasmopscf.wesenbergensis, Homalopscf.altumiandPlatylichas laxatus.It is possible that the lower part of the Slandrom limestone is faunistically different from the upper part, where i.a. Trelapis scticornisoccurs.