scholarly journals Controls on Early Cretaceous desert sediment provenance in south‐west Gondwana, Botucatu Formation (Brazil and Uruguay)

Sedimentology ◽  
2020 ◽  
Vol 67 (5) ◽  
pp. 2672-2690 ◽  
Author(s):  
Gabriel Bertolini ◽  
Juliana C. Marques ◽  
Adrian J. Hartley ◽  
Atila A. S. Da‐Rosa ◽  
Claiton M. S. Scherer ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Sediment Provenance ◽  
West Gondwana ◽  
South West ◽  
Botucatu Formation

An Early Cretaceous zamiaceous cycad of South West Gondwana: Restrepophyllum nov. gen. from Patagonia, Argentina

2010 ◽  
Vol 161 (3-4) ◽  
pp. 137-150 ◽  
Author(s):  
Mauro G. Passalia ◽  
Georgina Del Fueyo ◽  
Sergio Archangelsky
Keyword(s):  
Early Cretaceous ◽  
West Gondwana ◽  
South West

scholarly journals Paleomagnetic constraints on the age of the Botucatu Formation in Rio Grande do Sul, southern Brazil

2006 ◽  
Vol 78 (3) ◽  
pp. 591-605 ◽  
Author(s):  
Endale Tamrat ◽  
Marcia Ernesto
Keyword(s):  
Early Cretaceous ◽  
Late Jurassic ◽  
Rio Grande ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Paleomagnetic Pole ◽  
Oriented Samples ◽  
Normal Polarity ◽  
Reversed Polarity ◽  
Botucatu Formation

Paleomagnetic and rockmagnetic data are reported for the aeolian Botucatu Formation, in the southern Brazilian State of Rio Grande do Sul. Oriented samples were taken from a section located between the cities of Jaguari and Santiago. After thermal and alternating field demagnetization, both normal and reversed characteristic remanent magnetizations were found. These results yielded 13 reversed and 5 normal polarity sites, composing a magnetostratigraphic column displaying a sequence of reversed-normal-reversed polarity events. The paleomagnetic pole calculated for 18 sites is located at 114.7ºE, 78.5ºS (dp=8.1º; dm=1.2º), after restoring the strata to the paleohorizontal. This paleomagnetic pole indicates a Late Jurassic-Early Cretaceous age to the Botucatu Formation in the investigated area, and places the sampling sites at paleolatitudes as low as 21ºS.

DETERMINING SEDIMENT PROVENANCE HISTORY IN A GONDWANAN ERG: BOTUCATU FORMATION, NORTHERN PARANÁ BASIN, BRAZIL

2021 ◽  
pp. 105883
Author(s):  
G. Bertolini ◽  
J.C. Marques ◽  
A.J. Hartley ◽  
M.A.S. Basei ◽  
J.C. Frantz ◽  
...  
Keyword(s):  
Sediment Provenance ◽  
Paraná Basin ◽  
Parana Basin ◽  
Botucatu Formation

scholarly journals A review of the Late Jurassic–Early Cretaceous charophytes from the northern Aquitaine Basin in south-west France

2017 ◽  
Vol 79 ◽  
pp. 199-213 ◽  
Author(s):  
Roch-Alexandre Benoit ◽  
Didier Néraudeau ◽  
Carles Martín-Closas
Keyword(s):  
Early Cretaceous ◽  
Late Jurassic ◽  
South West ◽  
Aquitaine Basin

scholarly journals A new dinosaur ichnosite from the early Cretaceous Sousa Formation, Northeastern Brazil

2015 ◽  
Author(s):  
Hebert Bruno Hebert Campos ◽  
Niels Bonde ◽  
Maria Eduarda Leal ◽  
Mário André Dantas
Keyword(s):  
Early Cretaceous ◽  
New Record ◽  
Digital Camera ◽  
Northeastern Brazil ◽  
Plastic Sheet ◽  
Dinosaur Tracks ◽  
Theropod Tracks ◽  
The Moment ◽  
Botucatu Formation

Background. The Sousa Formation contains the richest dinosaur ichnofauna from the Early Cretaceous Rio do Peixe Basin, Northeastern Brazil. Occurs eventually ornithopod tracks, which are found also in the Antenor Navarro and Piranhas Formations. Together with one trackway from the Botucatu Formation, some isolated tracks from the Cenomanian São Luís Basin, and some trackways from the Early Cretaceous Corda Formation, at the moment, these occurrences indicates the only definitive presence of ornithopods in the Mesozoic of Brazil. Material & Methods. In 2015, a fieldwork was held to investigate potential dinosaur tracks in new ichnosites from the Sousa Formation. All the tracks were photographed individually using a digital camera Nikon Coolpix P520. The paleoichnological terminology and morphometric parametrers follows Thulborn (1990), Marty (2008) and Castanera et al. (2013). A plastic sheet was used for drawing the tracks. Directions and measurements of each dinosaur track, as well as the entire outcrop, were taken in situ. Results. The Pereiros ichnosite represents a new occurrence of dinosaur tracks from the Sousa Formation. The dinosaur ichnofauna comprises a medium-sized, bipedal ornithopod trackway, a single ornithopod track and one pair of theropod tracks. Discussion. The ornithopod trackway is characterized by plantigrade, tridactyl, mesaxonic, subsymmetrical and wider than long pes tracks, with large and rounded heels, and short and wide digit impressions. It is referred to the ichnofamily Iguanodontipodidae, previously reported for the Sousa beds. Two medium-sized theropod tracks assigned to Irenesauripus also occurs, representing an expansion of the paleobiogeographical record for this unusual ichnotaxa. The new record of Irenesauripus from the Sousa Formation shows an unusual pattern with morphological similarities to theropods tracks from the Lower Cretaceous Feitianshan Formation of Sichuan, China (Xing et al., 2013). According to Xing et al. (2011), the Chinese tracks preserve partial metatarsal pads that are not distinct from their respective metatarsophalangeal regions. Xing et al. (2011) noted the unusual elongate digit II claw impression, indicating that digit II of the trackmaker possessed a long claw, longer than on any of the other digits. Conclusions. The outcrop studied represents the nineteenth dinosaur tracksite in the Sousa Formation and gives further evidence of the rather rare ornithopod dinosaurs in the Cretaceous of Brazil.

scholarly journals A new dinosaur ichnosite from the early Cretaceous Sousa Formation, Northeastern Brazil

2015 ◽  
Author(s):  
Hebert Bruno Hebert Campos ◽  
Niels Bonde ◽  
Maria Eduarda Leal ◽  
Mário André Dantas
Keyword(s):  
Early Cretaceous ◽  
New Record ◽  
Digital Camera ◽  
Northeastern Brazil ◽  
Plastic Sheet ◽  
Dinosaur Tracks ◽  
Theropod Tracks ◽  
The Moment ◽  
Botucatu Formation

Background. The Sousa Formation contains the richest dinosaur ichnofauna from the Early Cretaceous Rio do Peixe Basin, Northeastern Brazil. Occurs eventually ornithopod tracks, which are found also in the Antenor Navarro and Piranhas Formations. Together with one trackway from the Botucatu Formation, some isolated tracks from the Cenomanian São Luís Basin, and some trackways from the Early Cretaceous Corda Formation, at the moment, these occurrences indicates the only definitive presence of ornithopods in the Mesozoic of Brazil. Material & Methods. In 2015, a fieldwork was held to investigate potential dinosaur tracks in new ichnosites from the Sousa Formation. All the tracks were photographed individually using a digital camera Nikon Coolpix P520. The paleoichnological terminology and morphometric parametrers follows Thulborn (1990), Marty (2008) and Castanera et al. (2013). A plastic sheet was used for drawing the tracks. Directions and measurements of each dinosaur track, as well as the entire outcrop, were taken in situ. Results. The Pereiros ichnosite represents a new occurrence of dinosaur tracks from the Sousa Formation. The dinosaur ichnofauna comprises a medium-sized, bipedal ornithopod trackway, a single ornithopod track and one pair of theropod tracks. Discussion. The ornithopod trackway is characterized by plantigrade, tridactyl, mesaxonic, subsymmetrical and wider than long pes tracks, with large and rounded heels, and short and wide digit impressions. It is referred to the ichnofamily Iguanodontipodidae, previously reported for the Sousa beds. Two medium-sized theropod tracks assigned to Irenesauripus also occurs, representing an expansion of the paleobiogeographical record for this unusual ichnotaxa. The new record of Irenesauripus from the Sousa Formation shows an unusual pattern with morphological similarities to theropods tracks from the Lower Cretaceous Feitianshan Formation of Sichuan, China (Xing et al., 2013). According to Xing et al. (2011), the Chinese tracks preserve partial metatarsal pads that are not distinct from their respective metatarsophalangeal regions. Xing et al. (2011) noted the unusual elongate digit II claw impression, indicating that digit II of the trackmaker possessed a long claw, longer than on any of the other digits. Conclusions. The outcrop studied represents the nineteenth dinosaur tracksite in the Sousa Formation and gives further evidence of the rather rare ornithopod dinosaurs in the Cretaceous of Brazil.

scholarly journals An occurrence of <i>Ammobaculites</i> (Foraminiferida, Lituolacea) in the Purbeck Formation (late Jurassic-early Cretaceous) of Dorset, south-west England

1993 ◽  
Vol 12 (1) ◽  
pp. 119-120 ◽  
Author(s):  
Jon D. Radley
Keyword(s):  
Early Cretaceous ◽  
Late Jurassic ◽  
South West ◽  
South West England

Abstract. An influx of Ammobaculites cf. obliquus Loeblich &amp; Tappan is documented from the late Jurassic-early Cretaceous Purbeck Formation of Dorset, south-west England. The foraminifera are interpreted as inhabitants of a dysaerobic, muddy, brackish lagoonal environment.

scholarly journals The Rio de la Plata craton and the adjoining Pan-African/brasiliano terranes: Their origins and incorporation into south-west Gondwana

2011 ◽  
Vol 20 (4) ◽  
pp. 673-690 ◽  
Author(s):  
Carlos W. Rapela ◽  
C. Mark Fanning ◽  
Cesar Casquet ◽  
Robert J. Pankhurst ◽  
Luis Spalletti ◽  
...  
Keyword(s):  
Rio De La Plata ◽  
Río De La Plata ◽  
La Plata ◽  
West Gondwana ◽  
South West ◽  
Pan African
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