The set up of an extensional margin in the Maiella Mt. during the early Cenomanian causes the growth of a flourishing Rudist assemblage. A community with Apricardia, Distefanella, Caprina, Schiosia and Caprinula evidence a rimmed shelf, with flat top and a marked break of slope in correspondence of the high energy shallow shelf edge. Abundant skeletal remains are resedimented along a steep and gullied slope. The facies sequence is to be connected with a relative sea level rise together with development of lowstand depositional systems. The occurring of a prograding biodetrital wedge is shown by upward shoaling cycles in the platform areas. During the Senonian, the relative sea level rise generates the building of an Hippuritid shallow-water complex with clear aggradational and retrogradational trend, characterized by Milovanovicia, Hippurites, Sabinia, Vaccinites, Sauvagesia, Hippuritella, Apricardia, Joufia, Pironaea, Rajka and Radiolitella, showing different ecological conditions at the water/sediment interface. During the Campanian p.p-Maastrichtian a stillstand and a slow fall of relative sea level are followed by new progradation phenomena and a decreasing of the water energy in the inner zone, evidenced by Apricardia and Radiolitella muddy facies. This evolutive sequence may be connected with a gradual decreasing of the slope angle and consequent enlargement of the transitional shallow-water belt. The Rudist fauna of Maiella Mt. shows clear affinities both with the external Dinarid-Hellenid belt and with the apulian-iblean foreland. Such evidence of faunistic and ecological correspondence could suggest the hypothesis that the previous mentioned areas were part of a single paleobiogeographic province.
SEDIMENTARY EVENTS AND RUDIST ASSEMBLAGES OF MAIELLA MOUNTAIN CENTRAL ITALY PALEOBIOGEOGRAPHIC IMPLICATIONS
ACCORDI G;
1987
Abstract
The set up of an extensional margin in the Maiella Mt. during the early Cenomanian causes the growth of a flourishing Rudist assemblage. A community with Apricardia, Distefanella, Caprina, Schiosia and Caprinula evidence a rimmed shelf, with flat top and a marked break of slope in correspondence of the high energy shallow shelf edge. Abundant skeletal remains are resedimented along a steep and gullied slope. The facies sequence is to be connected with a relative sea level rise together with development of lowstand depositional systems. The occurring of a prograding biodetrital wedge is shown by upward shoaling cycles in the platform areas. During the Senonian, the relative sea level rise generates the building of an Hippuritid shallow-water complex with clear aggradational and retrogradational trend, characterized by Milovanovicia, Hippurites, Sabinia, Vaccinites, Sauvagesia, Hippuritella, Apricardia, Joufia, Pironaea, Rajka and Radiolitella, showing different ecological conditions at the water/sediment interface. During the Campanian p.p-Maastrichtian a stillstand and a slow fall of relative sea level are followed by new progradation phenomena and a decreasing of the water energy in the inner zone, evidenced by Apricardia and Radiolitella muddy facies. This evolutive sequence may be connected with a gradual decreasing of the slope angle and consequent enlargement of the transitional shallow-water belt. The Rudist fauna of Maiella Mt. shows clear affinities both with the external Dinarid-Hellenid belt and with the apulian-iblean foreland. Such evidence of faunistic and ecological correspondence could suggest the hypothesis that the previous mentioned areas were part of a single paleobiogeographic province.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.