Palaeoecological implications of an Upper Cretaceous tetrapod burrow (Bauru Basin; Peirópolis, Minas Gerais, Brazil)

Martinelli, Agustín G.; Basílici, Giorgio; Fiorelli, Lucas E.; Klock, Carolina; Karfunkel, Joachim; Diniz, Ariela Costa; Soares, Marcus Vinícius Theodoro; Marconato, André; Silva, João Ismael da; Ribeiro, Luiz Carlos Borges; Marinho, Thiago da Silva

doi:10.1016/j.palaeo.2019.05.015

Cited by 16 publications

(18 citation statements)

References 81 publications

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“…The second stage in channel hydraulics can be inferred from the overlying conglomeratic sandstone, which is representative of the prevailing hydraulic character of the channel. At the base, the limited presence of tabular sets of planar cross-beds most likely reflects the transition from the previous gravel bars to the emplacement of small transverse bars (Smith, 1972;Martinelli et al, 2019). The predominance of lenticular sets of cross-stratification suggests deposition from sinuous and linguoid crested three-dimensional dunes (Miall, 2006;Collinson and Mountney, 2019) during most of the episode of channel sedimentation.…”

Section: Discussionmentioning

confidence: 99%

Landscape and depositional controls on palaeosols of a distributive fluvial system (Upper Cretaceous, Brazil)

Soares

Basílici

Lorenzoni³

et al. 2020

Sedimentary Geology

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Section: Discussionmentioning

confidence: 99%

Landscape and depositional controls on palaeosols of a distributive fluvial system (Upper Cretaceous, Brazil)

Soares

Basílici

Lorenzoni³

et al. 2020

Sedimentary Geology

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“…In this area there are extensive exposures of the Marília Formation, the sedimentary rocks of which consist of fine to medium‐grained sandstones intercalated with conglomeratic levels (Fúlfaro & Barcelos 1991; Martinelli et al . 2019). The rocks are formed by tabular beds of pale brown medium to coarse‐grained sandstone as well as pebbly sandstone, alternating with beds of red fine‐grained sandstone and successive white carbonate layers (Martinelli et al .…”

Section: Geological Settingmentioning

confidence: 99%

“…The rocks are formed by tabular beds of pale brown medium to coarse‐grained sandstone as well as pebbly sandstone, alternating with beds of red fine‐grained sandstone and successive white carbonate layers (Martinelli et al . 2019). The depositional system is usually interpreted as alluvial fans reworked by a braided fluvial system, with lacustrine limestones (Barcelos & Suguio 1987; Brusatte et al .…”

Section: Geological Settingmentioning

confidence: 99%

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A new unenlagiine (Theropoda, Dromaeosauridae) from the Upper Cretaceous of Brazil

Brum

Pêgas

Bandeira

et al. 2021

Papers in Palaeontology

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The record of unenlagiines in Brazil, except for one dorsal vertebra, is still under debate based on isolated teeth. Here, we describe Ypupiara lopai gen. et sp. nov., the first dromaeosaurid species from Brazil, from the Maastrichtian of the Bauru Group, Paran a Basin. The specimen consists of a partial right maxilla (with three teeth in loci) and a right dentary. Ypupiara is characterized by a restricted number of neurovascular foramina on the lateral surface of the maxilla, a rectangular and anteroposteriorly expanded interdental plate, and a labiolingual compression of the teeth, which have a labiolingual diameter more than 3/5 of the rostrocaudal diameter. Our phylogenetic analysis recovers Ypupiara as an unenlagiine based on the fluted teeth and places it as the sister taxon of Austroraptor due to the ratio of the labiolingual and mesiodistal diameters of the teeth being more than 3/5. We also erect the new group Unenlagiinia, which includes Unenlagiinae and Halszkaraptorinae. Ypupiara nests within Unenlagiinia based on the widely spaced teeth and the lack of mesial and distal carinae in the maxillary teeth. The morphology of the teeth is similar to Buitreraptor, although the proportions are markedly distinct. The teeth and comparisons with other Unenlagiinia also support fish being part of the diet for Ypupiara. We also performed a parsimony analysis of endemicity, which suggested that the presence of unenlagiines in Brazilian Upper Cretaceous outcrops is explained by dispersion or extinction events. The new species provides new information on the evolution of Gondwanan dromaeosaurids, and its preserved teeth provide new data to enable the assignment of isolated dromaeosaurid teeth from the Bauru Group.

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“…Moreover, the fossil record includes conchostracans, ostracodans, charophytans, molluscs (gastropods and bivalves; e.g. Carbonaro, Rohn, & Ghilardo, 2013; Dias‐Brito et al, 2001; Ghilardi, D'Agosta, Alves, & Arruda‐Campos, 2011) and ichnofossils (e.g., Francischini et al, 2016; Magalhães Ribeiro, 2002; Martinelli et al, 2019; Mineiro & Santucci, 2018; Paes Neto et al, 2018).…”

Section: Geological Settingmentioning

confidence: 99%

Sedimentology of a distributive fluvial system: The Serra da Galga Formation, a new lithostratigraphic unit (Upper Cretaceous, Bauru Basin, Brazil)

et al. 2020

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The Bauru Basin of SE Brazil is a large (ca. 370,000 km2) Upper Cretaceous intracratonic feature, important for its fossil remains and of particular value as a source of regional palaeoclimatic information. Historically, lithostratigraphic reconstructions have been performed mainly for successions of the central and southern parts of the basin, resulting in a lithostratigraphic scheme that is not applicable to the northernmost regions. In particular, the northeastern deposits of the Marília Formation (Serra da Galga and Ponte Alta members) reveal lithological, stratigraphic, and palaeontological differences from southeastern and northwestern counterparts (Echaporã Member). Nevertheless, these deposits are considered as a single lithostratigraphic formation in the literature. To address this problem, this study demonstrates how the northeastern deposits of the Marília Formation do not show affinity to the rest of the unit. A more suitable lithostratigraphic model is proposed for the northeastern succession as a distinct and independent unit. Lithofacies and palaeopedological analysis, combined with lithostratigraphic mapping of the northeastern deposits, reveal 11 distinct lithofacies and three pedotypes over an area of ~450 km2. Sedimentary facies and pedotypes were assigned to six interbedded architectural elements: (a) type 1 channel fill, (b) type 2 channel fill, (c) type 3 channel fill, (d) interchannels, (e) palaeosols, and (f) calcrete beds. The succession is interpreted as a distributive fluvial system with overall direction of flow to the NNW, and which developed under the influence of a semiarid climate regime. This contrasts with deposits of the southeastern and northwestern Marília Formation, previously suggested to be of fine‐grained aeolian affinity with interbedded poorly channelised deposits assigned to an aeolian sand sheet environment. By revising the existing lithostratigraphic scheme for the northeastern deposits, and contrasting them with laterally equivalent strata, this work demonstrates how the previously named Serra da Galga and Ponte Alta members reveal a unique set of lithological, architectural, and genetic signatures that permits to separate them from the Marília Formation. Finally, a new lithostratigraphic classification for the unit is proposed: the Serra da Galga Formation, whose deposition relates to an ancient distributive fluvial system.

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Palaeoecological implications of an Upper Cretaceous tetrapod burrow (Bauru Basin; Peirópolis, Minas Gerais, Brazil)

Cited by 16 publications

References 81 publications

Landscape and depositional controls on palaeosols of a distributive fluvial system (Upper Cretaceous, Brazil)

Landscape and depositional controls on palaeosols of a distributive fluvial system (Upper Cretaceous, Brazil)

A new unenlagiine (Theropoda, Dromaeosauridae) from the Upper Cretaceous of Brazil

Sedimentology of a distributive fluvial system: The Serra da Galga Formation, a new lithostratigraphic unit (Upper Cretaceous, Bauru Basin, Brazil)

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