In the late Cretaceous-Paleocene, Sardinia experienced a long period of subaerial exposure, partially interrupted by the marine transgression of the late Paleocene-early Eocene. Palustrine deposits are preserved in very small and thin outcrops sparse in the central and southern part of the island. Most of them are recognized and described for the first time. The palustrine deposits are mainly characterized by the abundance of charophyte remains, microbialitic laminae and envelopes and microcodium; ostracods and gastropods are also present. The richness in microcodium and microbialites, the predominance of calcified thalli and the scarcity of fructifications of the charophytes, the evidences of a pedogenetic evolution of the deposits are good proxies of a very shallow water sedimentary environment. The wide areal distribution of the outcrops suggests the presence of at least six main palustrine basins, grouped in two main regions. Palustrine and lacustrine deposits of the same age are well known from southern France and the Pyrenees; the Sardinian deposits confirm the environmental and climatic uniformity of the southeastern margin of the European paleocontinent, to which the Corso-Sardinian block was joined, in late Cretaceous-Paleocene times.
I depositi carbonatici palustrini paleocenici della Sardegna centro-meridionale (Italia)
DA PELO, STEFANIA
2007-01-01
Abstract
In the late Cretaceous-Paleocene, Sardinia experienced a long period of subaerial exposure, partially interrupted by the marine transgression of the late Paleocene-early Eocene. Palustrine deposits are preserved in very small and thin outcrops sparse in the central and southern part of the island. Most of them are recognized and described for the first time. The palustrine deposits are mainly characterized by the abundance of charophyte remains, microbialitic laminae and envelopes and microcodium; ostracods and gastropods are also present. The richness in microcodium and microbialites, the predominance of calcified thalli and the scarcity of fructifications of the charophytes, the evidences of a pedogenetic evolution of the deposits are good proxies of a very shallow water sedimentary environment. The wide areal distribution of the outcrops suggests the presence of at least six main palustrine basins, grouped in two main regions. Palustrine and lacustrine deposits of the same age are well known from southern France and the Pyrenees; the Sardinian deposits confirm the environmental and climatic uniformity of the southeastern margin of the European paleocontinent, to which the Corso-Sardinian block was joined, in late Cretaceous-Paleocene times.
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