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Ichnological analysis of lateral environmental heterogeneity within the Bonarelli Level (uppermost Cenomanian) in the classical localities near Gubbio, Central Apennines, Italy

Paolo Monaco, Francisco J. Rodriguez-Tovar and Alfred Uchman
Ichnological analysis of lateral environmental heterogeneity within the Bonarelli Level (uppermost Cenomanian) in the classical localities near Gubbio, Central Apennines, Italy
Palaios (January 2012) 27 (1): 48-54

Abstract

Dark, pelagic sediments of the uppermost Cenomanian Bonarelli Level (OAE2 event) interval, in two classical sections Contessa and Bottaccione in the Central Apennines, contain unbioturbated and bioturbated beds suggesting fluctuations in pore water oxygenation from anoxic to oxic or dysoxic conditions. The oxic and dysoxic improvement events prior to, during, and after the event are marked by biogenic structures showing an increase in the diversity of the trace fossils (Chondrites, Planolites, Thalassinoides, Trichichnus, and Zoophycos) from none to five ichnotaxa in individual beds. The number of anoxic events differs in the Contessa and Bottaccione sections, even though they are only 2.5 km apart. Comparison with sections from the Carpathians (Poland) and the Betic Cordillera (Spain), reveals that minor anoxic events below and above the Bonarelli Level are absent in the studied Apennine sections. Moreover, the diversity and density of trace fossils in the Apennine sections are lower than those from other studied sections in the Tethys, most likely indicating a comparatively lower availability of food in the Gubbio area as a result of its paleogeographic location. The preservation of trace fossils, controlled by the consistency of sediments and diagenetic processes, can mask diversity and density in some beds.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 27
Serial Issue: 1
Title: Ichnological analysis of lateral environmental heterogeneity within the Bonarelli Level (uppermost Cenomanian) in the classical localities near Gubbio, Central Apennines, Italy
Affiliation: Universita di Perugia, Dipartimento di Scienze della Terra, Perugia, Italy
Pages: 48-54
Published: 201201
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 57
Accession Number: 2012-024468
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., geol. sketch map
N43°22'00" - N43°22'00", E12°34'00" - E12°34'00"
Secondary Affiliation: Universidad de Granada, ESP, SpainJagiellonian University, POL, Poland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201213
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