Abstract

New stratigraphic and sedimentological observations on the Triassic sedimentary cycle in the Sarcidano-Gerrei area (SE Sardinia) permitted the definition of a more detailed stratigraphy; so the institution of a formal, lower lithostratigraphic unit named "Escalaplano Formations" (Upper Anisian-Ladinian), and the definition of an informal, upper unit named "Monte Maiore formation" (Ladinian) is proposed. It has been also possible to improve the definition of the sedimentary environment of these formations, framed in continental to marine contexts typical of the German Basin of the German Triassic. The chronostratigraphic boundaries of these units are also discussed, using the rare fossiliferous levels as biostratigraphic markers into the "Sepharadic" Biofacies Iberian Triassic Realm; in fact, as hypothesized by Hirsch (1972; 1977), the Sardinian Triassic seems to belong to the "Sepharadic" Domain. The knowledge of the sedimentary environments permitted more detailed paleogeographic reconstructions. A correlation between the Sardinian Triassic sedimentary cycle and the III order eustatic oscillation UAA-2.2 of HAQ et alii (1988) is attempted. Finally, alterations on the Triassic carbonatic lithologies induced by the subsequent repeated emersion periods are described and discussed.

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