The Telbesmi Formation, at the northern margin of the Arabian Plate, Turkey, is composed of alternating darkbrown,
pinky-brown fluvial arkosic sandstone/mudstones with thin-bedded cherty limestones and channel
conglomerates. The formation contains rare and poorly diversified trace fossils. The siltstone/sandstone beds of
levels 1 and 2 of the formation yielded, however, a moderately diverse assemblage composed of: Cochlichnus
isp., Palaeophycus isp., Planolites beverleyensis, Teichichnus isp. and ?Treptichnus rectangularis. This assemblage,
made up of traces left by deposit feeding organisms, represents the Scoyenia ichnofacies. Treptichnus
rectangularis and Palaeophycus isp., of the assemblage, can be considered markers for the base of the Cambrian
in southeast Turkey.