At the beginning of the Alpine cycle, the breakup of Pangea lead to the early stages of the
North Atlantic opening. In the western Iberian sector of the European margin, the Lusitanian
basin starts to evolve bordered eastwards by inherited reliefs from the late episodes of the
Variscan orogeny. The base unit, the Silves Group, considered not earlier than the Carnian,
is mainly siliciclastic and predominantly formed by arcosarenites to feldspar litarenites,
coarse to very coarse-grained (wackes) and pebbly, where the sediment architecture …

At the beginning of the alpine cycle, the breakup of Pangea leaded to the early stages ofthe
North Atlantic opening. In the Iberian sector of the European margin, starts to evolve the
Lusitanian Basin, bordered eastwards by inherited reliefs from the late episodes of the
Variscan orogeny. The base unit is the Silves Group which has been considered not earlier
than the Camian. We consider the possibility of a Lower Triassic age, for the earliest units,
by correlation with others, apparently similar, existing in the Algarve Basin (Fig. IA). The …