Abstract

The Lagonegro units are characterized by Late Triassic and Jurassic pelagic facies. The distal ones (Madonna del Sirino, Lagonegro succession) are made by the Calcari con Selce fm (late Ladinianlate Norian) and by the Scisti Silicei fm (Rhaetian-Tithonian). Reworked calcarenites are rare and the Scisti Silicei fm is very condensed. In the intermediate facies (Sasso di Castalda, Pignola), the Calcari con Selce fm is sometimes dolomitized; the Scisti Silicei fm contains calcirudites and coarse grained calcarenites. In the proximal facies (M. Pierno, S. Fele). the Calcari con Selce fm and the lower part of the Scisti Silicei fm are replaced by thin-bedded, cherty dolostones followed by massive dolostones (Norian to Toarcian). This dolostones are a transitional element between the typical Lagonegro facies and the Molise facies (Mt. Marrone). The Scisti Silicei fm (Middle and Late Jurassic) contains a large amount of calcarenites and calcirudites. The sedimentary environment was a deepening-upward basin, bordered in the northern side by carbonate platforms (Apenninic and Apulian platforms). This basin was a marginal part of the southwestern branch of the Tethys Ocean (Ionian Tethys).

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