Triassic freshwater ichnocoenoses from Carlsberg Fjord, east Greenland

This paper describes the occurrence of an unusually diverse and well preserved series of freshwater ichnocoenoses from redbeds of continental origin. The material includes seventeen ichnospecies. In addition, it allows the taxonomic revision of several controversial genera, particularly Cylindricum and Isopodichnus (placed in synonymy with Skolithos and Cruziana, respectively). Two new taxa are named: Fuersichnus communis and Steinichnus carlsbergi. The trace fossils were formed in two distinct continental environments: aquatic and terrestrial. Four ichnocoenoses are recognized: the Fuersichnus and Arenicolites assemblages, which are entirely aquatic, originating in lacustrine conditions; the Scoyenia assemblage, from extremely shallow lacustrine conditions, and the Rusophycus assemblage, representing a regularly desiccated fluviatile environment.