Two Aptian pelagic stratigraphic sections from the northern Gargano Promontory, Apulia, southern Italy, were investigated on the basis of foraminifera and calcareous nannofossils. The successions are characterized by cyclically arranged marls and marly/cherty limestones and can be referred to the Scisti a Fucoidi Formation. In the lower portion of this unit a thin black shale segment was recognized. Planktonic foraminiferal and calcareous nannofossil biostratigraphic data enable the level to be attributed to the upper part of the Globigerinelloides blowi and Chiastozygus litterarius Zones of late Early Aptian age. These data suggest that the black shale is equivalent to the Selli Level of the Umbria-Marche Basin, which is considered to be the sedimentary expression of the global oceanic anoxic event OAE 1a. A perturbation of the biotic signal occurs across the Selli Level. A crisis of Globigerinelloidids and nannoconids precedes and follows the anoxic episode, and a marked increase in ...
The Selli Level of the Gargano Promontory, Apulia, southern Italy: Foraminiferal and calcareous nannofossil data
LUCIANI, Valeria;
1999
Abstract
Two Aptian pelagic stratigraphic sections from the northern Gargano Promontory, Apulia, southern Italy, were investigated on the basis of foraminifera and calcareous nannofossils. The successions are characterized by cyclically arranged marls and marly/cherty limestones and can be referred to the Scisti a Fucoidi Formation. In the lower portion of this unit a thin black shale segment was recognized. Planktonic foraminiferal and calcareous nannofossil biostratigraphic data enable the level to be attributed to the upper part of the Globigerinelloides blowi and Chiastozygus litterarius Zones of late Early Aptian age. These data suggest that the black shale is equivalent to the Selli Level of the Umbria-Marche Basin, which is considered to be the sedimentary expression of the global oceanic anoxic event OAE 1a. A perturbation of the biotic signal occurs across the Selli Level. A crisis of Globigerinelloidids and nannoconids precedes and follows the anoxic episode, and a marked increase in ...I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
