Abstract
At Yewdale Beck in northern England, a brachiopod fauna dominated by species of Hindella, Kinnella, Mirorthis, Paromalomena and Plectothyrella, occurs interbedded with a graptolite fauna which includes Akidograptus ascensus, Atavograptus ceryx, Persculptograptus parvulus and Normalograptus spp. (including probable examples of N. normalis, N. angustus and N. medius) within the lower part of the Skelgill Formation. This suggests that taxa of the terminal Ordovician Hirnantia fauna occur within the lower P. acuminatus Biozone, representing the youngest documented occurrence of the Hirnantia brachiopod fauna. Biostratigraphy, brachiopods, graptolites, Ordovician-Silurian boundary.
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