Mancinelli, A.; Coccia, B. (1999). Le Trocholine dei sedimenti mesozoici di piattaforma carbonatica dell'Appennino centro-meridionale (Abruzzo e Lazio). [Trocholinas from Mesozoic platform sediments of Central-Southern Apennines (Italy).]. Revue de Paléobiologie. 18(1): 147-171.

187047

Mancinelli, A.; Coccia, B.

1999

18(1): 147-171

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Further micropaleontologic and biostratigraphic studies carried out on carbonatic Mesozoic sediments cropping out in the Gran Sasso d'Italia (Abruzzo) and Monte Cairo (southern Lazio) areas revealed many Trocholina associations, that appear particularly rich during Upper Tithonian-Valanginian. Detailed taxonomic studies of these benthic Foraminifera allowed us: 1) to describe a new species, Trocholina chiocchinii, found in the Upper Berriasian-Valanginian sediments of the Costa dell'Orsa stratigraphical section (Gran Sasso d'Italia); 2) to identify several species belonging to Trocholina PAALZOW, 1922 : Trocholina alpina (LEUPOLD), Trocholina campanella ARNAUD-VANNEAU et al., Trocholina cherchiae ARNAUD-VANNEAU et al., Trocholina chouberti HOTTINGER, Trocholina delphinensis ARNAUD-VANNEAU et al., Trocholina molesta GORBATCHIK, Trocholina cf. involuta MANTSUROVA, Trocholina sagittaria ARNAUD-VANNEAU et al. and Trocholina gigantea PELISSIE and PEYBERNES; 3) to give a short paleontological description of these species; 4) to supply their dimensional values; Many of these recently established species are not well known. Detailed studies carried out on the frequency (and or abundance) of Trocholina species and their local range in the Apennine between the Upper Tithonian-Valanginian, allowed us to draw the following conclusions: - from the Tithonian-Berriasian boundary, until the end of the Lower Berriasian, Trocholina alpina, Trocholina cf. involuta and Trocholina delphinensis were present; - at the beginning of the Upper Berriasian the first Trocholina campanella together with Trocholina chiocchinii n. sp. appeared; - at the beginning of the Valanginian the association was composed by Trocholina campanella, Trocholina chiocchinii n. sp., Trocholina cherchiae and Trocholina chouberti; - at the end of the Valanginian the most species of Trocholina disappeared and in the examined areas only rare specimens of Trocholina molesta GORBATCHIK continued until the end of the Lower Cretaceous. The palaeoecologic significance of Trocholinas has been hypothesized by means of detailed facies analysis carried out on the carbonatic sediments contained in the previously mentioned associations: the diffusion of these benthic Foraminifera seems to have been influenced by particular environmental conditions, first of all a rather high water energy. In fact the best associations observed come from stratigraphical successions deposited in the shelf of the Appennine platform (Gran Sasso) or in some areas of the platform very close to the shelf (Monte Cairo). Such facies, characterized by a rather strong water energy seems to be particularly favourable for the life and distribution of the Trocholina species, which, in the same time interval are completely missing in the inner facies of the Apennine platform.

Foraminifera

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