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all geography including DSDP/ODP Sites and Legs
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Primary terms
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Rio Grande do Sul Brazil
Contributions to melissopalynology studies in southern Brazil: pollen analysis in the honeys from Apis mellifera , Tetragonisca angustula , Melipona quadrifasciata quadrifasciata , Scaptotrigona bipunctata , Plebeia remota and Plebeia droryana
The nasal cavity of two traversodontid cynodonts (Eucynodontia, Gomphodontia) from the Upper Triassic of Brazil
On ex situ Ophiomorpha and other burrow fragments from the Rio Grande do Sul Coastal Plain, Brazil: paleobiological and taphonomic remarks
Late Paleozoic Ice-Age rhythmites in the southernmost Paraná Basin: A sedimentological and paleoenvironmental analysis
Understanding ecosystem dynamics of herbaceous grasslands (Campos) and arboreal forests (Bambuseae) using Poaceae pollen grains in the Coastal Plains Holocene sediments of Southern Brazil
A MIDDLE PERMIAN (ROADIAN) LUNGFISH AESTIVATION BURROW FROM THE RIO DO RASTO FORMATION (PARANÁ BASIN, BRAZIL) AND ASSOCIATED U-Pb DATING
A new stratigraphic framework built on U-Pb single-zircon TIMS ages and implications for the timing of the penultimate icehouse (Paraná Basin, Brazil)
SPATIAL VARIATION IN THE TEMPORAL RESOLUTION OF SUBTROPICAL SHALLOW-WATER MOLLUSCAN DEATH ASSEMBLAGES
Hepaticites iporangae Ricardi-Branco, Faria, Jasper, and Guerra-Sommer, 2011 from the early Permian of the Paraná Basin, Brazil, is not a liverwort but a tracheophyte
MICROBE-MEDIATED PRESERVATION OF INVERTEBRATE FECAL PELLETS: EVIDENCE FROM THE ICHNOFOSSIL PHYMATODERMA BURKEI , PERMIAN SHALLOW-MARINE, TERESINA FORMATION, SOUTHERN BRAZIL
FIRST REPORT OF FEEDING TRACES IN PERMIAN BOTRYCHIOPSIS LEAVES FROM WESTERN GONDWANA
MULTISTEP TAPHONOMIC ALTERATIONS IN FLUVIAL MOLLUSK SHELLS: A CASE STUDY IN THE TOURO PASSO FORMATION (PLEISTOCENE–HOLOCENE), SOUTHERN BRAZIL
Pseudomorphs of Low Microcline After Adularia Fourlings from the Alto Da Cabeça (Boqueirão) and Morro Redondo Pegmatites, Brazil
FIDELITY OF MOLLUSCAN ASSEMBLAGES FROM THE TOURO PASSO FORMATION (PLEISTOCENE–HOLOCENE), SOUTHERN BRAZIL: TAPHONOMY AS A TOOL FOR DISCOVERING NATURAL BASELINES FOR FRESHWATER COMMUNITIES
Hepaticites iporangae n. sp., Rio Bonito Formation, Early Permian (Sakmarian), Paraná Basin, Brazil, Western Gondwana
Cerro do Jarau is a prominent, ~13.5-km-wide, circular landform rising >200 m above the plains of the “pampas” in southern Brazil. The name (meaning Jarau hills) comes from the prominent crests of silicified sandstones, which form a semiring of elevated hills in the northern part of the structure. The origin of this structure has been debated for decades, and varied suggestions of its formation include either endogenous tectonic processes or large meteorite impact. However, no conclusive evidence to support either hypothesis has been presented to date. This structure was formed in Mesozoic volcano-sedimentary rocks of the Paraná Basin and consists of the Jurassic-Cretaceous Guará (sandstones), Botucatu (sandstones), and Serra Geral (basalts) formations. The Botucatu Formation sandstones are intensely silicified and deformed, and were subject to radial and annular faulting. Our investigations at Cerro do Jarau identified the occurrence of parautochthonous monomict lithic breccia and polymict breccias resembling suevite and striated joint surfaces resembling crude shatter cones in sandstones and basalts. In addition, our first mineral deformation studies show the presence of rare planar features in quartz clasts in polymict breccias. The identification of these features at Cerro do Jarau, for the first time, is suggestive of an impact origin for the structure. If confirmed by further investigation of possible shock features, Cerro do Jarau would become the sixth known impact structure in Brazil, as well as the fifth basalt-hosted impact structure on Earth.