Trilobites and stratigraphy of the Middle Ordovician Killeröd Formation, Scania, Sweden

Abstract

The Killeröd Fm (“Bronnii beds” or “Coscinorinus limestone”) is a thin, but distinctive formation in the Middle Ordovician, upper Uhakuan Stage, in SW Scania (Skåne), the southernmost province of Sweden. It is c. 70 cm thick and consists of alternating grey microcrystalline limestone and blue‐grey shaly mudstone. The Killeröd Fm is richly fossiliferous and has yielded a fairly extensive fauna consisting mainly of trilobites, but also of brachiopods, conodonts, and ostracodes. The trilobite fauna is dominated by the trinucleid trilobites Botrioides bronnii and B. efflorescens. Other trilobites are Arthrorhachis sp., Bronteopsis concentrica, Lonchodomas rostratus, Nileus platys, Platycalymene dila‐tata, Platycalymenel sp., Pseudomegalaspis patagiata, Remopleurides sp., and Telephina aff. granulate This fauna bears a close resemblance to those of the lower Andersö Shale in Jämtland, central Sweden, and the upper Elnes Fm in the Oslo Region, Norway. It is concluded that the trilobite fauna of the Killeröd Fm is indicative of the Hustedograptus teretiusculus Zone, being in accordance with conodont‐based correlations.

Månsson, K., 1995: Trilobites and stratigraphy of the Middle Ordovician Killeröd Formation, Scania, Sweden. GFF, Vol. 117 (PL 2, June), pp. 97–106. Stockholm. ISSN 1103–5897.

Keywords:

• Trilobita
• Middle Ordovician
• Uhakuan Stage
• stratigraphy
• correlation
• taxonomy
• Killeröd Formation
• Killeröd
• Scania
• Sweden