Resumen de Trazas fósiles e Icnofacies y su relación con el ambiente sedimentario, Formación Hawaz, Ordovícico, Libia
Jordi M. de Gibert, Emilio Ramos Guerrero, Mariano Marzo Carpio, K. Tawengi, N. Bolatti
The ichnological study of the Hawaz Formation evidence the existence of an important correlation between lithofacies associations and trace fossil assemblages. Recognized ichnoassemblages can be linked to two archetypal Ichnofacies: Skolithos and Cruziana. The first is represented by strogly bioturbated sandstones with Skolithos, a vertical dwelling burrow od a suspension-feeder. These piperocks characterize persistent high-energy settings, such as those found in shoreface or inner platform setting. In contrast, the Cruziana ichnofacies is constituted by horizontal locomotion, feeding or resting trace, mostly produced by deposit-feeders. The most abundant trace fossils are Cruziana, Rusophycus and Artrophycus. This Ichnofacies is found in hetherolitic facies corresponding to lower-energy shallow subtidal setting. The incorporation of ichnological data to sedimentological analysis demonstrates to be a powerful tool in paleoenvironmental interpretation of depositional settings.
