Trilobite traces on basal Ordovician Layers from the Argentine Puna.· In this paper the ichnofauna from Guayoc Chico Formation from the Cangrejillos area is described. The association contains Cruziana semiplicata, C. sp. aff. C. breadstoni, Rusophycus sp. and cf. Phycodes.
These trace fossils indicate Lower Ordovician age.
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