Eolian Environments&lt;subtitle&gt;Their Characteristics, Recognition, and Importance&lt;/subtitle&gt;

Bigarella, João José

doi:10.2110/pec.72.02.0012

Cited by 72 publications

(59 citation statements)

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“…The Albian sample from the Sào Paulo Plateau (Section 356-43-5) indicates extensive deserts, on the order of the modern Sahara Desert, possibly backed by highlands where warm climates promoted extensive chemical weathering somewhat similar to present-day environments in Nigeria. This desert may have been the Botucatu-Sambaiba desert described by Bigarella (1972); generally arid conditions here during the Mesozoic have also been noted by Butler (1970). Here wind directions determined from cross-bedding dip directions in outcrops suggest that offshore winds would have existed in the southern portion of the paleodesert blowing east and northeast towards the Sào Paulo Plateau area.…”

Section: Discussionsupporting

confidence: 60%

Surface Features on Quartz Sand and Silt Grains: Leg 39 Deep Sea Drilling Project

Krinsley¹,

McCoy²

1977

Initial Reports of the Deep Sea Drilling Project

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Section: Discussionsupporting

confidence: 60%

Surface Features on Quartz Sand and Silt Grains: Leg 39 Deep Sea Drilling Project

Krinsley¹,

McCoy²

1977

Initial Reports of the Deep Sea Drilling Project

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“…Very few slip face deposits are present (Bigarella and Popp, 1966;Bigarella et al, 1969;Bigarella, 1972). The dune morphology is attributed to variations in wind flow direction, with erosion being inhibited by both vegetation and/or moisture.…”

Section: Factors Controlling Dome Dune Genesismentioning

confidence: 99%

“…High wind velocities (McKee, 1966), and variations in wind flow directions (Bigarella, 1972) have also been speculated to impede slip face development. If the concept of slip face inhibition is correct, the depositional processes and environmental conditions which resulted in slip face inhibition differ from area to area.…”

Section: Factors Controlling Dome Dune Genesismentioning

confidence: 99%

Geomorphology, Sedimentary Structures, and Genesis of Dome Dunes in Western Canada

Halsey¹,

Catto²

2007

gpq

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ABSTRACTDome dunes in four stabilized, inland dune fields in western Canada are predominantly composed of horizontal to low-angle cross-strata, indicating that slip face development was rare. Dip angles of lee side deposits decrease upward in the dome dunes. The spread of dip directions increases with elevation in the dunes, spanning 360° for topset deposits. Sedimentary structures indicative of moisture (adhesion laminae) and vegetation (scour surfaces) occur in the dunes and denivation features are also present. Sediment adhesion is responsible for the maintenance of the dome morphology. Sediment sorting within the dome dunes is poorer than in other local dune types in the vicinity, suggesting that less reworking/ineffective selective transport occurred and that the dome dunes are more efficient in retaining sediment. The rarity of slip face and grainfall deposits and the abundance of low angle deposits indicate that preferential accumulation of sediment at the top of the lee side did not occur. Development of domal morphology is a consequence of the inhibition of slip face development. In inland, relatively moist boreal environments, the primary factor limiting or precluding sediment accumulation at the crest of the dunes is a low rate of sedimentation.

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“…Posteriormente, outros autores acrescentaram informações sobre as dunas do litoral paranaense (Bigarella 1965, 1972, Bigarella et al 1969a,b, 1970/71, 1978, Angulo 1993a.…”

Section: Dunas (Holoceno)unclassified

Mapa Do Cenozóico Do Litoral Do Estado Do Paraná

Ângulo¹

2004

GEO

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RESUMOO objetivo do trabalho é apresentar um novo mapa dos sedimentos cenozóicos da região litorânea do Estado do Paraná. A área foi mapeada na escala 1:50.000. Foram identificadas unidades compostas por sedimentos continentais e costeiros com idades do Mioceno Inferior até o Holoceno. O litoral paranaense é composto por três unidades geomorfológicas principais: Serra do Mar, Primeiro Planalto e Planície costeira. A Serra do Mar é composta por bordas dissecadas de planalto e por núcleos serranos formados por erosão diferencial denominados altas serras. Os setores de Primeiro Planalto paranaense incluídos na área de estudo correspondem a áreas que antigamente pertenciam à bacia do Rio Iguaçu e que, atualmente, como conseqüência de sucessivas capturas, drenam para as bacias das baías de Paranaguá e Guaratuba. A planície costeira se estende ao longo de toda a costa paranaense e tem largura de até 55 km. A planície formou-se durante os dois últimos ciclos transgressivo/regressivos do Quaternário, relacionados aos ciclos glaciais. Na planície costeira foram mapeadas: planícies com cordões litorâneos e planícies paleoestuarinas do Pleistoceno Superior e Holoceno, dunas frontais do Holoceno e planície de maré, fundos rasos, deltas de maré, depressões intercordões e praias atuais. Também foram mapeadas unidades compostas por sedimentos continentais tais como, Fm. Alexandra do Mioceno Inferior, leques e cones aluviais do Plio-Quaternário e tálus, colúvios e sedimentos fluviais do Quaternário.Palavras-chave: Mapa geológico, litoral paranaense, sedimentos cenozóicos, Cenozóico, Quaternário. ABSTRACTThis work aims at presenting a new map of the Cenozoic sediments of the coastal zone of the State of Paraná, Brazil. The study area was mapped on 1:50.000 scale. There were mapping units of continental and coastal sediments ranging from Lower Miocene to Holocene. The Paraná coastal zone is made up of three main geomorphologic units: mountains (Serra do Mar), plateau (Primeiro Planalto) and coastal plain. The mountains

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Eolian Environments<subtitle>Their Characteristics, Recognition, and Importance</subtitle>

Cited by 72 publications

References 0 publications

Surface Features on Quartz Sand and Silt Grains: Leg 39 Deep Sea Drilling Project

Surface Features on Quartz Sand and Silt Grains: Leg 39 Deep Sea Drilling Project

Geomorphology, Sedimentary Structures, and Genesis of Dome Dunes in Western Canada

Mapa Do Cenozóico Do Litoral Do Estado Do Paraná

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