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Subterraniphyllum and free-living Neogoniolithon (coralline algae) from the Oligocene reef facies of Costa d'Ovada (Tertiary piedmont basin, Alessandria, NW Italy)

Grazia Vannucci, Massimiliano Testa, Michele Piazza and Paolo Pastorino
Subterraniphyllum and free-living Neogoniolithon (coralline algae) from the Oligocene reef facies of Costa d'Ovada (Tertiary piedmont basin, Alessandria, NW Italy)
Italian Journal of Geosciences (February 2010) 129 (1): 4-14

Abstract

The present study examines the siliciclastic sediments and reef limestone of the Oligocene transgressive event of the Tertiary Piedmont Basin outcropping in the area of Costa d'Ovada (Alessandria, Southern Piedmont, NW Italy). Seven lithostratigraphic sections have been studied. On the basis of the lithostratigraphic evidence, sedimentary architectures and structures, and paleontological data a paleoenvironmental reconstruction is suggested. The reef of Costa d'Ovada rests on siliciclastic marine sediments and was buried by siliciclastic sandy and/or gravely shallow marine deposits. This reef was built in warm tropical or subtropical, clear and very shallow waters, on sandy gravely, moderately exposed bottoms. It might be interpreted as a patch reef developed close to the coastline. In the depicted paleoenvironmental frame, an unusual, for the Tertiary Piedmont Basin, Neogoniolithon-dominated coralline algae association is described and interpreted. This association is characterised by the common occurrence of free-living thalli of Neogoniolithon raripunctatum and intergenicula of Subterraniphyllum thomasii. Finally, the paleoecological meaning of these species is discussed.


ISSN: 2038-1719
EISSN: 2038-1727
Coden: BOGIAT
Serial Title: Italian Journal of Geosciences
Serial Volume: 129
Serial Issue: 1
Title: Subterraniphyllum and free-living Neogoniolithon (coralline algae) from the Oligocene reef facies of Costa d'Ovada (Tertiary piedmont basin, Alessandria, NW Italy)
Affiliation: Universita di Genova, Dipartimento per lo Studio del Territorio e delle sue Risorse, Genoa, Italy
Pages: 4-14
Published: 201002
Text Language: English
Summary Language: Italian
Publisher: Societa Geologica Italiana, Rome, Italy
References: 70
Accession Number: 2010-089986
Categories: PaleobotanyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch map
N44°25'00" - N44°40'00", E08°30'00" - E09°00'00"
Country of Publication: Italy
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201048
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