The Bonarelli Level (BL) is a radiolarian-ichthyolithic, organic-rich marker bed that was deposited close to the Cenomanian/Turonian boundary (CTB) representing the sedimentary expression of the global Ocea - nic Anoxic Event 2 (OAE2). In northeastern Italy this horizon yielded fossil remains documenting a rather diverse ichthyofauna. The assemblage was studied by Sorbini in 1976 based on material from a single locality, Cinto Euganeo. Subsequently, other localities yielding fish remains have been discovered. Our revision also includes fish remains from three new fish-bearing localities, the Carcoselle Quarry, the Valdagno-Schio tunnel and Quero other than those from Bomba Quarry near Cinto Euganeo. At least 27 taxa were identified, including nine previously not reported from the Bonarelli Level, namely: Scapanorhynchus raphiodon , Cretalamna appendiculata , Archaeolamna kopingensis , ‘ Nursallia ’ tethysensis , Belonostomus sp., Dixonanogmius dalmatius , ‘ Protosphyraena ’ stebbingi and the beryciform Hoplopteryx sp. The overall assem - blage mostly consists of crossognathiforms, tselfatiiforms and aulopiforms. A comparison of the taxonomic diversity with coeval assemblages evidences a general similarity with nearby western Tethyan fish assemblages and especially with the Jbel Tselfat ichthyofauna, although some of the taxa are exclusively shared with the assemblages of the boreal realm (English Chalk, Westphalia and Saxony). However, additional information would be necessary to more properly define the main global ichthyogeographic patterns during the Cenomanian.

UPPER CENOMANIAN FISHES FROM THE BONARELLI LEVEL (OAE2) OF NORTHEASTERN ITALY

JACOPO AMALFITANO
;
LUCA GIUSBERTI;ELIANA FORNACIARI;
2020

Abstract

The Bonarelli Level (BL) is a radiolarian-ichthyolithic, organic-rich marker bed that was deposited close to the Cenomanian/Turonian boundary (CTB) representing the sedimentary expression of the global Ocea - nic Anoxic Event 2 (OAE2). In northeastern Italy this horizon yielded fossil remains documenting a rather diverse ichthyofauna. The assemblage was studied by Sorbini in 1976 based on material from a single locality, Cinto Euganeo. Subsequently, other localities yielding fish remains have been discovered. Our revision also includes fish remains from three new fish-bearing localities, the Carcoselle Quarry, the Valdagno-Schio tunnel and Quero other than those from Bomba Quarry near Cinto Euganeo. At least 27 taxa were identified, including nine previously not reported from the Bonarelli Level, namely: Scapanorhynchus raphiodon , Cretalamna appendiculata , Archaeolamna kopingensis , ‘ Nursallia ’ tethysensis , Belonostomus sp., Dixonanogmius dalmatius , ‘ Protosphyraena ’ stebbingi and the beryciform Hoplopteryx sp. The overall assem - blage mostly consists of crossognathiforms, tselfatiiforms and aulopiforms. A comparison of the taxonomic diversity with coeval assemblages evidences a general similarity with nearby western Tethyan fish assemblages and especially with the Jbel Tselfat ichthyofauna, although some of the taxa are exclusively shared with the assemblages of the boreal realm (English Chalk, Westphalia and Saxony). However, additional information would be necessary to more properly define the main global ichthyogeographic patterns during the Cenomanian.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11577/3337767
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