Results 61 to 70 of about 12,589 (253)

Redescription of †Eobrasilia coutoi (Metatheria: Polydolopimorphia), a unique sclerocarpophagous metatherian from the Palaeogene of South America: Systematic affinities, and paleoecological and evolutionary implications

open access: yesThe Anatomical Record, EarlyView.
Abstract The ‘Palaeogene strata’ of the Itaboraí Basin (upper Paleocene‐lower Eocene), Southeastern Brazil, has preserved 29 genera and almost 50 species of metatherians (about 65% of its mammalian diversity). Among them, Eobrasilia coutoi Simpson, 1947 is the most enigmatic due to its quite fragmentary nature.
Leonardo M. Carneiro   +10 more
wiley   +1 more source

Cretaceous geology of Lower California

open access: yes, 1935
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Anderson, Frank Marion, Hanna, G Dallas
openaire   +2 more sources

First evidence of a mandibular crest in Brasileodactylus Kellner, 1984 (Pterosauria, Pteranodontoidea, Anhangueridae), with comments on pterosaur headcrests

open access: yesThe Anatomical Record, EarlyView.
Abstract Brasileodactylus araripensis Kellner, 1984, is a toothed pterosaur from the Lower Cretaceous Romualdo Formation of the Araripe Basin, Brazil. Traditionally regarded as crestless, the species has been central to debates on anhanguerid taxonomy, as most members of the clade possess well‐developed sagittal cranial or dentary crests.
Anderson da Silva Nascimento   +4 more
wiley   +1 more source

Geology of groundwater occurrences of the Lower Cretaceus sandstone aquifer in East Central Sinai, Egypt

open access: yesAcque Sotterranee, 2017
The present study focused on investigating the impact of geological setting on the groundwater occurrences of the Lower Cretaceous sandstone aquifer (Malha).
Saad Younes Ghoubachi
doaj   +1 more source

"European" ammonites in the Lower Cretaceous of Antarctica

open access: yes, 1982
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire   +3 more sources

The Lower Cretaceous in the wells of Northwestern Bulgaria

open access: yesGeologica Balcanica, 1993
The lower Cretaceous is developed all over the Northwestern Bulgaria and is usually represented by the Berriasian to the Albian stage. The only exception is the area to the northwest of the Yarlovica zone (Gomotarci-Vidin region) where the stages above the Valanginian are absent. The lithostratigraphic units (Gložene, Kaspičan, Makreš, Salaš, Simeonovo,
Todor Nikolov, Nikolina Ruskova
openaire   +1 more source

Morphological plasticity in the dentition of the lungfish Gnathorhiza from the Permian of Brazil: A population‐level geometric morphometric analysis

open access: yesThe Anatomical Record, EarlyView.
Abstract Dental plates are pivotal in the lungfish paleontological record, constituting highly mineralized structures resilient to diagenetic processes. This study provides a detailed description and quantitative shape analysis of 95 newly discovered Gnathorhiza sp. dental plates from the Middle–Late Permian Corumbataí Formation, Brazil.
Mauro B. S. Lacerda   +4 more
wiley   +1 more source

A Época de Abertura do Oceano Atlântico Sul com Base em Dados Paleomagnéticos

open access: yesBrazilian Journal of Geophysics, 1984
African palaeomagnetic poles for the Triassic, Jurassic and Cretaceous were compared with the corresponding poles of South America in the pre-drift reconstruction of the continents after Martin et al. (1981), by means of an F-test.
Sonia Dias Cavalcanti Guerreiro   +1 more
doaj   +1 more source

Bioerosion traces in bones reveal an increase in ethological diversity in the insect exploitation of carcasses in the late Triassic

open access: yesThe Anatomical Record, EarlyView.
Abstract This study presents the first detailed description of bioerosion traces produced by insects in bones from the Santa Cruz Sequence (early Carnian, Santa Maria Supersequence, Brazil). An array of traces is reported, consisting of notches, a tube, trails of grooves attributed to the ichnotaxon Osteocallis mandibulus and ornamented depressions ...
Lucca S. Cunha   +2 more
wiley   +1 more source

Cortical bone geometry and static gravitational loads in neosauropod dinosaurs: Implications for biomechanical constraints on terrestrial gigantism

open access: yesThe Anatomical Record, EarlyView.
Abstract Sauropod dinosaurs achieved unprecedented terrestrial gigantism, raising questions about the biomechanical limits of bone under extreme gravitational loads. We estimated static gravitational pressures (Pg) on appendicular cortical bone in neosauropods, including diplodocoids, brachiosaurids, and titanosaurs.
Tito Aureliano   +4 more
wiley   +1 more source

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