Bone diagenesis of tetrapods from the Middle Triassic Tarjados Formation: implication for depositional environment and palaeoclimate

Mancuso, Adriana Cecilia; Previtera, Elena

doi:10.1007/s12549-021-00500-4

Cited by 3 publications

(1 citation statement)

References 45 publications

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“…however, paleoclimatic studies of the Sierra Barrosa Formation are needed to expand paleoenvironmental knowledge of the studied area. Similar diagenetic features have been identified in other vertebrate remains (e.g., González Riga & Astini, 2007;González Riga et al, 2009;Previtera et al, 2013Previtera et al, , 2016Previtera, 2017Previtera, , 2019aPrevitera, , 2019bMancuso & Previtera, 2022).…”

Section: Bone Diagenesissupporting

confidence: 74%

Kaijutitan Maui, Un Saurópodo Titanosaurio Del Cretácico Superior (Formación Sierra Barrosa, Cuenca Neuquina) Del Norte De Patagonia Argentina: Consideraciones Tafonómicas Y Análisis Histológico

Filippi,

Previtera,

Garrido

2024

PEAPA

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Kaijutitan maui is a basal titanosaur from the Sierra Barrosa Formation (Coniacian, Upper Cretaceous), Neuquén Basin, Patagonia Argentina. The Neuquén Basin in northwestern Patagonia, Argentina, holds the most important record of Cretaceous dinosaurs from South America. This work constitutes the first case of taphonomic and histological study of a dinosaur from the Rincón de los Sauces area. Kaijutitan is represented by cranial and postcranial materials of an adult individual of huge body size, preserved in clay sediments related to a floodplain environment. Bones were found disarticulated but associated, largely respecting their relative anatomical position. histological and diagenetic features of bones were analyzed in order to interpret the alteration degree of bone microstructure. Biostratinomic processes inferred are subaerial biodegradation, disarticulation, preburial weathering (cracking and flacking), and abrasion. Fossil-diagenetic processes comprise compaction, deformation, permineralization, and fracturing. Permineralization stages included infilling of bone cavities and fractures with sediments, iron oxides, calcite, or an iron oxide-calcite association during the burial history. Some characteristics suggest that the Kaijutitan specimen suffered weathering for a certain period of time before final burial and that biological activity in the carcass acted as a dispersal agent for the bones within the paleontological site.

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Section: Bone Diagenesissupporting

confidence: 74%

Kaijutitan Maui, Un Saurópodo Titanosaurio Del Cretácico Superior (Formación Sierra Barrosa, Cuenca Neuquina) Del Norte De Patagonia Argentina: Consideraciones Tafonómicas Y Análisis Histológico

Filippi,

Previtera,

Garrido

2024

PEAPA

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Vertebrate Fossil Permineralization in a Sequence Stratigraphic Context: Capsules of Early Diagenesis From Shallow-Marine Siliciclastics (Eocene, Egypt)

LAKER

2024

Palaios

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Understanding the drivers of vertebrate fossil preservation is important for paleontologists who rely on well-preserved fossils to study the biological or ecological context of the fauna they represent. Differences in preservation limit the ability to compare biological or ecological change across time. Bones, however, can contain clues of their preservational history: natural voids in skeletal remains are potential sites of mineral precipitation during early and late diagenesis, and the reactive bioapatite provides chemical and physical signals of the post-mortem environment. The sensitivity of both infilling minerals and taphonomic alteration to the post-mortem environment has yet to be tested in the fossil record. Bones associated with discontinuity surfaces such as hiatal flooding surfaces and erosional sequence boundaries should face prolonged exposure at the sediment-water interface and/or within the surface mixed layer, increasing the opportunity for modification by taphonomic processes and geochemically disparate (redox) conditions, compared with bones from facies within aggradational intervals, where burial is most likely to be rapid and immediately permanent. µXRF and thin-section-based petrographic analysis of marine mammal bones from the famously fossiliferous Eocene siliciclastics of Wadi al-Hitan, Egypt, reveal strong variation with stratigraphic position: bones found along the sequence boundary show Fe-oxide linings and evidence of desiccation and subaerial exposure, distinct from bones of other settings; a bone from the maximum flooding surface uniquely lacks calcite but has brecciated cancellous bone; bones from systems tracts are variable in the extent of infill but show calcite microfacies consistent with exclusively subaqueous and specifically shallow marine deposition. Early diagenetic signatures were preserved despite many fossil specimens being strongly fractured and infilled by gypsum precipitated during weathering. Bones and their abundant pore space thus acted as time-capsules of early diagenetic conditions, retaining authigenic minerals and other microtaphonomic features linked to their original (Eocene) depositional context.

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Integrating Fossil Diagenesis and Geochemistry in the Paleoenvironmental Reconstruction of a Tank Deposit Bearing Quaternary Vertebrates in Northeastern Brazil

2022

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Bone diagenesis of tetrapods from the Middle Triassic Tarjados Formation: implication for depositional environment and palaeoclimate

Cited by 3 publications

References 45 publications

Kaijutitan Maui, Un Saurópodo Titanosaurio Del Cretácico Superior (Formación Sierra Barrosa, Cuenca Neuquina) Del Norte De Patagonia Argentina: Consideraciones Tafonómicas Y Análisis Histológico

Kaijutitan Maui, Un Saurópodo Titanosaurio Del Cretácico Superior (Formación Sierra Barrosa, Cuenca Neuquina) Del Norte De Patagonia Argentina: Consideraciones Tafonómicas Y Análisis Histológico

Vertebrate Fossil Permineralization in a Sequence Stratigraphic Context: Capsules of Early Diagenesis From Shallow-Marine Siliciclastics (Eocene, Egypt)

Integrating Fossil Diagenesis and Geochemistry in the Paleoenvironmental Reconstruction of a Tank Deposit Bearing Quaternary Vertebrates in Northeastern Brazil

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