B. Galbrun et al., MAGNETOSTRATIGRAPHY AND BIOSTRATIGRAPHY O F THE TOARCIAN AMMONITICO-ROSSO FORMATION FROM THE IONIAN ZONE (EPIRUS, GREECE), Eclogae Geologicae Helvetiae, 87(1), 1994, pp. 91-111
Magnetostratigraphic results were obtained from three sections of Ammo
nitico-Rosso Formation in Epirus (Greece). These red nodular limestone
s display standard magnetic characteristics. Magnetite and haematite a
s pigment contribute to the natural remanence. The stable characterist
ic magnetic component was recognized by thermal demagnetization in the
range of 350-550-degrees-C. Magnetic polarity sequences were establis
hed for each section. Few ammonites were found at some levels, mainly
in the Middle Toarcian. The conjunction of biostratigraphic and magnet
ostratigraphic data allow to propose correlations between the sections
studied and with the Toarcian ammonitico-rosso limestones section of
Iznalloz (Betic Cordillera. Spain). The extension of the Ammonitico-Ro
sso Formation is variable depending on the sections and does not cover
the whole Toarcian stage. The appareance of the ''Calcaires a Filamen
ts'' Formation succeeding the red nodular limestones seems to be synch
ronous over the two distinct paleogeographic units studied through the
Ionian basin.