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Préface
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3
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Lithostratigraphy
The glaucony-bearing
horizon in the lower Miocene Bisciaro Formation (Umbria-Marche Apennines)
A. Amorosi
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Volcanogenic
and paleomagnetic studies on the Cenozoic calc-alkalic eruptive
sequence of Monte Furru (Bosa, mid-western Sardinia) A.
Assorgia, L.S. Chan, A. Demo, C. Garbarino, A. Montanari, R. Rizzo &
R.Tocco
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17
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Litho-
and Biostratigraphy
The volcaniclastic
bodies in the lower Miocene Bisciaro Formation (Umbria-
Marche Apennines, central Italy) A. Amorosi,
R. Coccioni & F. Tateo
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33
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Miocene
diatom rich section of Aramengo (Monferrato, Piedmont): preliminary results
M.C. Bonci, P. Clari, E. Ferrero M, A. Negri,
C. Pirini R., B. Ricci & G. Valleri
|
47
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The Livello
Raffaello (early Miocene) in the Umbria-Marche Apennines, Italy: stratigraphy,
paleontology, mineralogy, and geochemistry R. Coccioni,
N. Morandi & F. Tateo
|
55
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Volcano-sedimentary
beds of Oligocene age from the Tertiary Piedmont Basin (NW Italy): biostratigraphy
and mineralogy A. d'Atri & F. Tateo
|
79
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Stratigraphic
and volcaniclastic events in the Vicchio Marls Auct. (Cervarola Tectonic
Unit) along the Monte Fatucchio section (northern Apennines, Italy) M.
Delle Rose, F. Guerrera, A. Renzulli & F. Serrano
|
97
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Niveaux
volcanoclastiques du Miocene inférieur et moyen d'Albanie K
Vathi, I. Fili & G.S. Odin
|
115
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Biostratigraphy
The first occurrence
of Neogloboquadrina atlantica (Berggren) in the Mediterranean R.
Coccioni, S. Galeotti & R. Di Leo
|
27
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Calcareous
plankton biostratigraphy of the marne a Orbulina Unit (Miocene, central
Italy) M.L. Pampaloni, R.M. Pichezzi, I. Raffi
& M. Rossi
|
139
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| Dinoflagellate
cysts palaeoenvironmental analysis of the Oligocene/Miocene transition in
northwest and central Italy D. Zevenboom, H. Brinkhuis
& H. Visscher |
155
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|
Chemostratigraphy
Serravallian shales
in the Monte del Corvi pelagic sequence (Ancona, Italy): an organic geochemical
perspective M.A. Kruge, B.A. Stankiewicz &
A. Montanari
|
173
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Geochronology
40Ar/39Ar geochronology
of a Burdigalian tuff from central-northern Sardinia G.S.
Odin, A. Assorgia, S. Barca, A. Porcu, C. Spano, J. Hernandez & M.
Cosca
|
185 |
Premiers
âges géochronologiques de niveaux volcanoclastiques oligocènes
de la Région de Zasavje, Slovénie G.
S. Odin, B. Jelen, K Drobne, J. Uhan, D. Skaberne, J. Pavsic, F. Cimerman,
M. Cosca & J. C. Hunziker |
199
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This volume
contains a selection of scientific papers first presented at a conference
held in Portonovo (Ancona, Italy) on November 11-15, 1992, under the aegis
of the Subcommission on Geochronology
(SOG) of the International Union of Geological Sciences, Commission on Stratigraphy.
We have organised this meeting as a rendez-vous for the participants of the
Mlocene COlumbus Project (MICOP), an initially European-American research
project later (following Portonovo) transformed to an International program
undertaken by a specific Working Group of the SOG. The working approach to
this research project was to apply geochronology to selected Miocene fossiliferous
sections, therefore attempting an integrated stratigraphic definition of the
Miocene marine record.
The main objective of these studies was to propose the means
for global stratigraphic correlation, and in particular: 1)
search for sections in which different analytical methodologies and approaches
could be applied; 2) collect the results which would be useful for general
correlation purposes; and 3) on the basis of the whole wealth of new data
and knowledge derived from the MICOP, forward recommendations on the choice
of particularly interesting sections and points for the refinement of the
chronostratigraphic time scale (GSSP: Global Boundary Stratotype Section and
Point).
The papers included in this special volume are mainly of specialistic character
(i.e. litho-stratigraphic, litho- and biostratigraphic, biostratigraphic,
chemostratigraphic, and geochronologic), and regional relevance. The MICOP
contributions which through interregional correlation and interdisciplinary
approaches leads to Integrated stratigraphy,
will constitute the content of another special volume, currently in preparation,
under the title of "Miocene Integrated Stratigraphic Sequence" (MISS),
which will be published elsewhere.
As editors of both these volumes, and organizers of the MICOP, we would like
to thank all the colleagues who contributed to the success of this project.
We also thank the supporters of the MICOP conference including the "Giunta
of the Regione Marche", Mr. Aldo Roscioni, owner of the hosting Hotel
"La Fonte" in Portonovo, the Geological Observatory of Coldigioco
(Charles Smith), and the MICOP technical staff. We are particularly grateful
to Franco Ricci Lucchi for having made possible the publication of this special
volume and the colleagues who kindly reviewed the manuscripts.
December
30, 1994
Rodolfo Coccioni
Alessandro Montanari
Gilles Serge Odin
