Two different types of Upper Paleozoic sandstones from Southportuguese Zone are studied. Data coming
from petrographic, sedimentological and regional analyses of the sandstones point to two different anomalies
in relation with Dickinson and et al.’s provenance model. Discrimination between modal analysis and
petrographic study of arenites is noted, as well as discrimination between source and tectonic setting of
the provenance are
