New, accurately located and well-preserved agnostid trilobite material has been collected from the type locality of Drumian (middle Cambrian, Miaolingian) Manuels River Formation, Newfoundland, Canada. The well-exposed grey to black shales containing fauna were deposited on former microcontinent Avalonia. Four interval zones for succession are proposed, namely, Tomagnostus fissus, Hypagnostus p...