Nereites trails and other sandflat trace fossils from Portas de Almourão geomonument (Lower Ordovician, Naturtejo Geopark)

Carlos Neto de Carvalho, Andrea Baucon

Abstract


Sandflat intertidal-to-shallow subtidal ichnoassociations from the Lower Ordovician of Portas de Almourão are described. Straight Nereites jacksoni following a rippled topography were found in very shallow Skolithos ichnofacies, being interpreted as simple feeding trails made by an unknown arthropod while exploiting a microbial mat.


Keywords


Trace fossils, Nereites trails, sandflats, Lower Ordovician, Portas de Almourão.

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