BIO- AND MAGNETO-STRATIGRAPHY IN THE TIBER VALLEY REVISED
1998; Elsevier BV; Volume: 47-48; Linguagem: Inglês
10.1016/s1040-6182(97)00071-2
ISSN1873-4553
AutoresM. Borzi, Maria Gabriella Carboni, G. Cilento, Letizia Di Bella, Fabio Florindo, Odoardo Girotti, E. Piccardi, Leonardo Sagnotti,
Tópico(s)Geomagnetism and Paleomagnetism Studies
ResumoThe stratigraphy of three sections of marine deposits in the Tiber valley, north of Rome, was investigated in detail. Biostratigraphic investigation covered the Valle Ricca (Tini quarry), Fosso Liano and Lugnano sections. The Valle Ricca and Lugnano sections show continuity in sedimentation from the latest Pliocene to Early Pleistocene. In the Fosso Liano section Upper Pliocene sediments are missing, as in other outcrops in central Italy, and the Lower Pleistocene deposits lie unconformably on the Middle Pliocene ones. Possible causes of these features are discussed. Magnetostratigraphy and rock magnetism analyses were performed only in the Valle Ricca section. The data shows that the previously recognised reversal around a volcanic level is the effect of strong changes in the magnetic mineralogy and it is not representative of true geomagnetic changes.
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