Middle Ordovician, Silurian, and Permo-Carboniferous faunas, but no clearly determinable Devonian forms, were recognized during restudy of collections of supposedly Devonian fossils from the Venezuelan Andes. The Paleozoic stratigraphic nomenclature has been reviewed accordingly, and it is proposed to retain the name Caparo formation for unmetamorphosed Ordovician and Silurian siltstones and sandstones, to apply the name Mucuchachi formation (not group) to predominantly slaty metamorphic rocks containing Permo-Carboniferous faunas in the upper beds, and to suppress the names Remolino, Libertad, and Rio Momboy formations as unnecessary synonyms for parts of the Caparo and Mucuchachi formations.

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