The small, intramontane San Giorgio Basin in southwestern Sardinia has yielded macrofloras dominated by sphenophytes, but with subsidiary pteridosperms, ferns, and very rare lycopsids and cordaites. They can be assigned to the upper part of the Lobatopteris vestita Zone or possibly the Odontopteris cantabrica Zone, therefore indicating a late Asturian or Cantabrian age (equivalent to a late Moscovian age in the lUGS global chronostratigraphical scheme). They can therefore be correlated with the post-Leonian deposits in northern Spain, the Nyi'any Member in Western and Central Bohemia , and the Llantwit Beds in South Wales. It provides further evidence for the widespread influence of the Leonian Phase of tectonic activity in middle Asturian times, whose effect can be observed across Europe. The San Giorgio Basin is therefore a late V ariscan rather than post-Variscan basin.
A taxonomic synopsis of the Middle Pennsylvanian flora of the San Giorgio Basin, southern Sardinia
PITTAU, PAOLA;SCANU, GIOVANNI GIUSEPPE;
2013-01-01
Abstract
The small, intramontane San Giorgio Basin in southwestern Sardinia has yielded macrofloras dominated by sphenophytes, but with subsidiary pteridosperms, ferns, and very rare lycopsids and cordaites. They can be assigned to the upper part of the Lobatopteris vestita Zone or possibly the Odontopteris cantabrica Zone, therefore indicating a late Asturian or Cantabrian age (equivalent to a late Moscovian age in the lUGS global chronostratigraphical scheme). They can therefore be correlated with the post-Leonian deposits in northern Spain, the Nyi'any Member in Western and Central Bohemia , and the Llantwit Beds in South Wales. It provides further evidence for the widespread influence of the Leonian Phase of tectonic activity in middle Asturian times, whose effect can be observed across Europe. The San Giorgio Basin is therefore a late V ariscan rather than post-Variscan basin.
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