The microfossil content of nodular limestones of the late Early to Middle Cambrian Campo Pisano Formation from the Gutturu Pala section of southwestern Sardinia is described and discussed with respect to palaeoecological conditions. Based on detailed facies investigations, the vertical succession of the sedimentary evolution and fossil distribution is interpreted as an environmental change from shallow-subtidal conditions at the beginning of the Campo Pisano Formation to at least deep-subtidal conditions at its end. Due to the faunal characteristics, an interim shallowing during that process is likely. A dramatic facies replacement with the onset of the Campo Pisano Formation indicates a strong reorganisation of the environment, explained by tectonic instability of the platform, accompanied by moderate sea-level rise and palaeogeographical and maybe climate changes. During most of the time, the persistence of only one palaeoecological assemblage indicates a more or less stable, open marine, deeper subtidal environment for most of the Campo Pisano time. Among the taxa represented in the highly fossiliferous sediments, trilobites, echinoderms, brachiopods, and poriferids predominates; further elements are chancellorids, hyolithids, pelagiellids, hyolitheminthids, and bradoriids arthropods. This occurrence in the Campo Pisano Formation is published here for the first time. The following bradoriid and trilobite species are newly introduced: Hipponicharion ichnusum n. sp., Condylopyge antiqua n. sp., and – described in open nomenclature – Clavigellus? n. sp.

Cambrian microfauna and palecology of the Campo Pisano Formation at Gutturu Pala (Iglesiente, SW Sardinia, Italy)

PILLOLA, GIAN LUIGI
2004

Abstract

The microfossil content of nodular limestones of the late Early to Middle Cambrian Campo Pisano Formation from the Gutturu Pala section of southwestern Sardinia is described and discussed with respect to palaeoecological conditions. Based on detailed facies investigations, the vertical succession of the sedimentary evolution and fossil distribution is interpreted as an environmental change from shallow-subtidal conditions at the beginning of the Campo Pisano Formation to at least deep-subtidal conditions at its end. Due to the faunal characteristics, an interim shallowing during that process is likely. A dramatic facies replacement with the onset of the Campo Pisano Formation indicates a strong reorganisation of the environment, explained by tectonic instability of the platform, accompanied by moderate sea-level rise and palaeogeographical and maybe climate changes. During most of the time, the persistence of only one palaeoecological assemblage indicates a more or less stable, open marine, deeper subtidal environment for most of the Campo Pisano time. Among the taxa represented in the highly fossiliferous sediments, trilobites, echinoderms, brachiopods, and poriferids predominates; further elements are chancellorids, hyolithids, pelagiellids, hyolitheminthids, and bradoriids arthropods. This occurrence in the Campo Pisano Formation is published here for the first time. The following bradoriid and trilobite species are newly introduced: Hipponicharion ichnusum n. sp., Condylopyge antiqua n. sp., and – described in open nomenclature – Clavigellus? n. sp.
Microfossils, Palaeoecology, Campo Pisano Formation, Cambrian, Sardinia; Microfossili, Paleoecologia, Formazione di Campo Pisano, Cambriano, Sardegna; Microfossiles, Paléoécologie, Formation de Campo Pisano, Cambrien, Sardaigne
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/12807
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