Palmatolepis triangularis Sannemann, 1955

Fig. 5A–C.

Palmatolepis triangularis; Sannemann 1955: 327–328, pl. 24: 3 [= holotype]; Over 1997: 172, 10.1, 10.5.

Remarks.—The lowest occurrence of Palmatolepis triangularis has been used to define the base of the Famennian and the Lower Pa. triangularis Zone, although rare specimens occur in the uppermost Frasnian prior to the final extinction event and horizon recognized as the Frasnian–Famennian boundary (Klapper et al. 1994; Schülke 1995; Over 1997). In practice the boundary is recognized by the absence (extinction) of Frasnian conodont species and the lowest abundant occurrence of Pa. triangularis .