Abstract
A temporary exposure of Middle Llandovery (Aeronian) shales in the Swedish town of Motala has yielded a rich collection of shelly fauna and graptolites. The shelly fauna is restricted to a thin mudstone band in a graptolitic shale sequence, and is within theconvolutus Biozone. This mudstone band may be correlated with a similar mudstone in the Kolka core from northwestern Latvia. The faunas, including the trilobites, from the two occurrences represent the same species. In the collection from Motala, nine species of trilobites are present, of whichAcernaspis dispersa sp. nov. is new. The material represents the first trilobite fauna described from the Middle Llandovery of Sweden.
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