DIGITAL INVESTIGATION OF LAMNIFORM SHARK VERTEBRAE FROM THE SIBILLINI MTS. (NORTHERN APENNINES, ITALY)
DOI:
https://doi.org/10.54103/2039-4942/22571Keywords:
Early Miocene; Bisciaro; Dead-fall; CT-SCAN; 3D model.Abstract
During the sampling of a stratigraphic section along the shore of the Fiastra Lake (Carg Project - Sheet 313 “Camerino” of the Geological Map of Italy at 1:50 000 scale), a small rock boulder with partially exposed bony material was discovered at the base of a small cliff at the northern termination of the Sibillini Mts. In this area, the classical facies of Umbria-Marche stratigraphic succession are well exposed. The Oligocene-Miocene portion of the succession is represented by the ~200 m-thick Scaglia Cinerea Formation, passing upwards to the ~100 m-thick Bisciaro Formation. The microfossil assemblage has allowed the specimen to be constrained to the lower Burdigalian. The skeletal remains were examined using a CT-SCAN, a non-invasive method that has proven to be highly performing. The analysis revealed some articulated vertebrae, deformed by lithostatic compaction, which are attributed to a shark of the Order Lamniformes. Subsequently, the vertebrae were digitally isolated, extracted from the surrounding matrix, and rendered into three-dimensional prints. Through digital retro-deformation, the body length of the lamniform shark was estimated to be approximately 4 metres. Further considerations on the vertebrae allowed us to infer that the studied shark had similarities to either Isurus oxyrinchus Rafinesque, 1810 or Carcharodon carcharias Linnaeus, 1758. The development of a dead-fall microbial community likely facilitated the preservation of the vertebrae. The studied specimen represents the first occurrence of a lamniform shark in the Lower Miocene of the Umbria-Marche Domain and represents one of the very rare recorded occurrences of lamniforms from the Lower Miocene of Italy.
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Copyright (c) 2024 ALFIO MOSCARELLA, MARCO ROMANO, LORENZO CONSORTI, ANGELO CIPRIANI, GABRIELE BINDELLINI, GIUSEPPE MARRAMÀ, GIORGIO CARNEVALE, ADELE GARZARELLA, MARIA LETIZIA PAMPALONI, PAOLO CITTON, FERDINANDO SPANO', CHIARA D'AMBROGI, CRISTINA MURARO, ERNESTO PAOLO PRINZI, GIUDITTA RADEFF, GINO ROMAGNOLI, SIMONE FABBI
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Accepted 2024-06-05
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