The Mt. Gottero Unit (internal Ligurid Units, Northern Apennines) is characterized by a thick and well preserved sequence made up by Palombini Shales, Val Lavagna Shales and Mt. Gottero Sandstones. The Bocco Shales rest unconformably on the last formation. This sequence is interpreted as the sedimentary cover of Jurassic ophiolites. Calcareous nannofossil assemblages provide new data on the age of these formations which are significantly different from those of the previous works. The uppermost level of Palombini Shales shows a nannofacies assigned to Calculites obscurus biozone, Late Santonian. The calcareous nannofossils found in the Val Lavagna Shales allow us to attribute to this formation a Campanian-?Early Maastrichtian age while the top of the Mt. Gottero Sandstones can be referred to Paleocene p.p. age according to Passerini and Pirini (1964). Some suggestions are proposed and discussed as regards these new data
The age of the ophiolite sedimentary cover from the Mt.Gottero Unit (Internal Ligurid Units, Northern Apennines): new data from calcareous nannofossils.
MARRONI, MICHELE;PERILLI, NICOLA
1990-01-01
Abstract
The Mt. Gottero Unit (internal Ligurid Units, Northern Apennines) is characterized by a thick and well preserved sequence made up by Palombini Shales, Val Lavagna Shales and Mt. Gottero Sandstones. The Bocco Shales rest unconformably on the last formation. This sequence is interpreted as the sedimentary cover of Jurassic ophiolites. Calcareous nannofossil assemblages provide new data on the age of these formations which are significantly different from those of the previous works. The uppermost level of Palombini Shales shows a nannofacies assigned to Calculites obscurus biozone, Late Santonian. The calcareous nannofossils found in the Val Lavagna Shales allow us to attribute to this formation a Campanian-?Early Maastrichtian age while the top of the Mt. Gottero Sandstones can be referred to Paleocene p.p. age according to Passerini and Pirini (1964). Some suggestions are proposed and discussed as regards these new dataI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
