Abstract
The Alpstein (northeastern Switzerland) has yielded a relatively high diversity of Cretaceous macrofossils. Here, new discoveries of invertebrate fossils from a new locality of the early to late Albian age in Semelenberg (northeastern Alpstein, canton St. Gallen) are documented. In spite of the very small size of these samples and the 1-m-thick, very condensed section, the locality yielded four ammonite species that are here documented for the first time from Switzerland. One of these species is new and Eoscaphites kuersteineri sp. nov. is introduced as new taxon. We also investigated the paleoecology of the middle to late Albian of this region based on the abundant macrofossils. The alpha diversity at Semelenberg is very similar to that of a previously documented fauna from several localities in the northeastern Alpstein region of similar age, which are located 2–10 km west of Semelenberg. A minor discrepancy is rooted in the proportion of benthic organisms, which may indicate slight differences in bathymetry between Semelenberg and the previously studied locality (northeastern Alpstein).
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