Fluvial Environments - Trace Fossils as Indicators of Sedimentary Environments - page 332

FIGURE 2 Some representative trace fossils of the Scoyenia Ichnofacies. (A) Scoyenia (meniscate
burrow, black arrows) cut by a mud-crack fill (white arrow). Preserved as positive hyporelief.
(B) Two specimens (arrows) of Siskemia (arthropod trackway), preserved in negative epirelief.
(C) Spongeliomorpha (burrow system, arrows) in positive hyporelief. (D) Rusophycus (trough-like
relief) indicated by arrow, negative epirelief. (E) Bedding plane with mud-draped ripples (white
arrows), mud cracks (black arrows), simple horizontal burrows (shb), possible Scoyenia (Sc) and
Spongeliomorpha (Sp), and Capayanichnus (Ca). Note cross-cutting relationships between the trace
fossils and sedimentary structures. (F) Two specimens (arrows) of the ichnogenus Taenidium
(meniscate burrow), endorelief. The examples are from the Permian Carapacha Formation, La
Pampa, Argentina (A, B, D); the Early Jurassic Santo Domingo Formation, La Rioja Province,
Argentina (C and F); and the Oligocene-Miocene Vinchina Formation (E).