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A complex trace fossil from the Spitskop Member (terminal Ediacaran–? Lower Cambrian) of southern Namibia

S. JENSEN^*,* and B. N. RUNNEGAR

^* Area de Paleontologia, Facultad de Ciencias, Universidad de Extremadura, 06071 Badajoz, Spain
Department of Earth and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, CA 90095-1567, USA

^* Author for correspondence: soren{at}unex.es

Streptichnus narbonnei igen. et isp. nov., a new trace fossil from the upper part of the Spitskop Member of the Urusis Formation, southern Namibia, consists of clusters of unidirectionally curved radial elements, in which individual elements typically are composed of imbricated sickle-shaped segments somewhat comparable to those of Treptichnus pedum. Such complex trace fossils generally are found only in Cambrian or younger strata. This opens to question the position of the Ediacaran–Cambrian boundary in the Nama Group, suggesting that it may locally be within the uppermost part of the Urusis Formation, rather than at the base of the Nomtsas Formation.

Key Words: Ediacaran • Cambrian • Namibia • trace fossils