Senhora do Salto Fold
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Senhora do Salto Fold

by Nuno Correia, Porto, Portugal

Quartzites (Santa Justa Formation) Fold
Valongo Anticline,
The lithostratigraphic succession of the Valongo Anticline spans the Cambrian to Carboniferous. Concerning the Ordovician component, distinguished three formations: the Santa Justa Formation (Lower Ordovician),
Valongo Formation (Middle Ordovician), and Sobrido Formation (Upper Ordovician). An early succession of supposed Tremadocian age, underlying basal quartzites of the Santa Justa Formation.