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| Registros recuperados: 61 | |
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| Palynological analysis of the Malanzán Formation in the Paganzo Basin, northwestern Argentina, has yielded six well-preserved palynological assemblages. Fifty-nine species were determined: 37 spores, 19 pollen grains, and 3 algae. Thirty-two of these species have not been recorded so far from the Malanzán Formation, and all pollen species are illustrated for the first time. These assemblages are referred to Sub-Biozone A of the Raistrickia densa-Convolutispora muriornata Biozone, Serpukhovian in age. Moreover, the abundance of monosaccate pollen grains might constrain the Malanzán Formation to the late Serpukhovian. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina; Malanzán Formation; Carboniferous; Palynology. |
| Ano: 2009 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142009000300005 |
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| Zavattieri,Ana María; Mego,Natalia. |
| Well-preserved spore-pollen assemblages from the type locality of the Paso Flores Formation, in the Estancia Paso Flores area, on the southeastern side of the Limay River, northern Patagonia, Argentina, are presented in this contribution. In this area, the Paso Flores Formation is exposed along the boundary between the Río Negro and Neuquén provinces; it consists mainly of conglomerates, sandstones and mudstones and contains remains of the Dicroidium Flora. The facies associations suggest gravelly to sandy braided river systems as the main depositional environments of the lower to middle sections of the unit outcropping in this region. The palynofloral assemblages contain 48 species of bryophytic and pteridophytic spores, 30 species of gymnospermous pollen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Palynology; Upper Triassic; Paso Flores Formation; Patagonia; Argentina. |
| Ano: 2008 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142008000200018 |
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| Borromei,Ana M.; Quattrocchio,Mirta. |
| An early-middle Holocene section in Bahía Lapataia (54º 50' S, 68º 34' W), Beagle Channel, Tierra del Fuego, Argentina has been examined taking into account its sporomorphs and organic-walled microplankton. The palynological assemblage suggests nearshore environments. Two relatively higher sea levels were identified by the increased abundance of organic-walled dinoflagellate cysts (Brigantedinium spp., Selenopemphix sp., Operculodinium centrocarpum sensu Wall and Dale, Spiniferites spp.), the acritarch Halodinium sp. and zoomorph remains (test linings of foraminifera and copepod egg-envelopes). The littoral vegetation at the time of the marine incursion was mainly arboreal, as can be seen in the pollen records by significant increase in Nothofagus dombeyi... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Palynology; Paleoenvironment; Holocene transgression; Bahía Lapataia; Beagle Channel; Tierra del Fuego; Argentina. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000100011 |
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| Amenábar,Cecilia R.; Di Pasquo,Mercedes; Carrizo,Hugo A.; Azcuy,Carlos L.. |
| Palynological analysis of the Chigua and Malimán formations of Middle Devonian and Mississippian age respectively, is presented. They crop out in the Del Volcán Range at the Río Blanco Basin in western Argentina. In this second part, 40 indigenous species of cavate, pseudosaccate and cingulizonate spores from both units are illustrated. The species Geminospora sp. cf. G. tuberculata var. tuberculata McGregor is recorded in the Middle Devonian of South America for the first time. The following species are also recorded in the Mississippian of South America for the first time as Crassispora invicta Playford, Densosporites asperus Braman and Hills, Densosporites gracilis Smith and Butterworth, Densosporites secundus Playford and Satterthwait, Densosporites... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Palynology; Chigua Formation; Malimán Formation; Middle Devonian; Mississippian; San Juan Province; Argentina. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000300005 |
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| Souza,Paulo A.; Perinotto,José A.J.; Félix,Cristina M.; Araújo,Bruno C.. |
| The Aquidauana Formation is a Permo-Carboniferous sedimentary unit, widely stratigraphicaly distributed in the northwestern and northern portions of the Paraná Basin. However, little paleontological data is available from this formation, preventing accurate biostratigraphic and paleoecological interpretations. An abundant, diversified and well preserved assemblage of palynomorphs was recognized from sampling conducted in an outcrop section in Cipolândia District of Aquidauana Municipality, state of Mato Grosso do Sul, Brazil. A total of 35 indigenous palynomorph taxa was recognized, comprising 6 species of spores (related to 5 genera), 28 species of pollen grains (14 genera) and 1 species of chlorophycean algae. Monosaccate pollen grains are exceptionally... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biostratigraphy; Paleoecology; Palynology; Pennsylvanian. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200611 |
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| LUZ,CYNTHIA F.P. DA; MAKI,ERICA S.; HORÁK-TERRA,INGRID; VIDAL-TORRADO,PABLO; MENDONçA FILHO,CARLOS VICTOR. |
| The presented paper considered the pollen morphology of thirteen species belonging to seven genera of the Fabaceae family occurring in the Pau-de-Fruta Special Protection Area (SPA), Diamantina, state of Minas Gerais, Brazil. The pollen grains of six species ofChamaecrista [C. cathartica (Mart.) H.S. Irwin & Barneby, C. debilis Vogel, C. flexuosa (L.) Greene, C. hedysaroides (Vogel) H.S. Irwin & Barneby, C. glandulosa (L.) Greene, and C. papillata H.S. Irwin & Barneby] have a similar morphology, characterized by three long colporated apertures with a central constriction. The species share specific morphological features regarding pollen size, endoaperture type (circular, lalongate or lolongate) and SEM ornamentation patterns of the exine... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Espinhaço Southern Mountain Range; Fabaceae; Palynology; Pollen morphology. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401329 |
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| KUHN,LIDIA A.; SOUZA,PAULO A.; CANCELLI,RODRIGO R.; SILVA,WAGNER G.; MACEDO,RENATO B.. |
| ABSTRACT This paper presents a paleoenvironmental reconstruction from palynological analyses of a sedimentary core of Holocene age, drilled at municipality of Garopaba (Santa Catarina), Southern Brazil. A total of 46 samples was collected for palynological analyses in the 450 cm-long core PCSC-3, as also three samples for radiocarbon dating and granulometric analyses. The palynological content includes 84 taxa related to pollen grains of angiosperms (38) and gimnosperm (3), spores of pteridophyta (16) and bryophyta (2), spores of fungi (8), algae (3), acritarchs (3), dinoflagellate cysts (2) and microforaminiferal linings (1). Three specimens of acritarchs are described and illustrated in detail. Three palynological phases were defined based on changes in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coastal plain; Environmental evolution; Holocene; Palynology; Santa Catarina. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602581 |
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| Luz,Cynthia F.P. da; Barth,Ortrud M.; Silva,Cleverson G.. |
| Palynological analysis of pollen, Pteridophyta spores and algae deposited in the superficial sediments at Lagoa de Cima and Lagoa do Campelo Lakes, located in the north of Rio de Janeiro state, was used to determine the spatial variation of the palynomorphs deposition. A total of 67 pollen types were identified at Lagoa de Cima, with an expressive contribution of regional arboreous taxa, hydrophytes and ruderal plants of the pastureland. The depositional pattern of palynomorphs depends on the fluvial leakage, the proximity of the local sedimentation to the inlet of the Imbé and Urubu Rivers and the bathymetry of lake bottom. The highest concentrations of palynomorphs were observed in the decentralized and less deeper area, without the interference of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algae deposition; Campos dos Goitacazes municipality; Palynology; Pollen deposition. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300016 |
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| MEDEIROS,VANDA B. DE; OLIVEIRA,PAULO E. DE; SANTOS,RUDNEY A.; BARRETO,ALCINA M.F.; OLIVEIRA,MARCELO A.T. DE; PINAYA,JORGE L.D.. |
| Abstract We present two pollen diagrams from the semi-arid Caatinga of the Catimbau National Park, in Pernambuco and from a Mauritia palm forest in the Caatinga/Cerrado ecotone of southern Piauí, NE Brazil, spanning the last 10,000 cal. yrs BP and the last 1,750 cal yrs BP, respectively. These two records contain a signature of the local vegetation and permit the correlation of the pollen signal with regional climatic changes. The Catimbau record shows Zizyphus sp., a typical Caatinga taxon, in all three pollen zones indicating regional Caatinga vegetation and the predominance of local arboreal taxa adapted to high humidity from 10,000 to ca. 6,000 cal. yrs BP with a gradual tendency towards drier conditions revealed by a deposition hiatus between 6,000 to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Paleoclimatology; Palynology; Pernambuco; Piauí; Caatinga vegetation. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502011 |
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| GUIMARÃES,JOSÉ T.F.; SAHOO,PRAFULLA K.; SOUZA-FILHO,PEDRO W.M.; FIGUEIREDO,MARIANA M.J. COSTA DE; REIS,LUIZA S.; SILVA,MARCIO S. DA; RODRIGUES,TARCÍSIO M.. |
| ABSTRACT Down-core changes in sedimentary facies, elemental geochemistry, pollen, spore, δ13C, δ15N and radiocarbon records from a filled lake, named R4, of the Serra Sul dos Carajás were used to study the relationship between the paleomorphological and paleoecological processes and their significance for Holocene paleoclimatology of the southeast Amazonia. The sediment deposition of the R4 lake started around 9500 cal yr BP. Increase of detrital components from 9500 to 7000 cal yr BP suggests high weathering of surrounding catchment rocks and soils, and deposition into the lake basin under mudflows. At that time, montane savanna and forest formation were already established suggesting predominance of wet climate. However, from 7000 to 3000 cal yr BP, a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon Forest; Canga vegetation; Palynology; Carbon and nitrogen isotopes; Geochemistry. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000400502 |
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| Macedo,Renato B.; Souza,Paulo A.; Bauermann,Soraia G.; Bordignon,Sérgio A.L.. |
| A sedimentar core collected at Santo Antônio da Patrulha, Rio Grande do Sul State, southmost Brazil, was submitted to pollen analysis to provide the vegetational history of this region, and the paleoecological and paleoclimatic changes. A total of 98 taxa of palynomorphs was identified from 35 subsamples. Three radiocarbonic datings were obtained along a section of 115 cm depth, including the basal age of 4730 ± 50 yr BP. Pollen diagrams and cluster analysis were performed based on palynomorphs frequencies, demonstrating five distinct phases (SAP-I to SAP-V), which reflected different paleoecological conditions. The predominance of plants associated with grasslands in the phase SAP-I suggests warm and dry climate conditions. A gradual increasing of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Palynology; Paleoecology; Paleoclimatology; Atlantic rainforest; Late Holocene; Rio Grande do Sul State. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000300020 |
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| Sousa,Saulo M.; Pierre,Patrícia M.O.; Torres,Giovana A.; Davide,Lisete C.; Viccini,Lyderson F.. |
| The pollen morphology and exine structure of 17 species of Lippia L. were investigated in this work using light and scanning electron microscopy. Among the species studied, 14 showed tricolporate pollen grains, two had tri- and tetracolporate pollen grains and a single species exhibited, only tetracolporate pollen. The amb ranged from triangular to square, and the shape varied from oblate-spheroidal to prolate-spheroidal. Three different types of exine ornamentation were observed: psilate, scabrate and perforate. In addition to morphological data, we found positive association between the chromosome numbers and size of pollen grains, and also between the length and width of the colpi. The results indicate that the characteristics of pollen grains in Lippia... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chromosome numbers; Lippia; Palynology; Palynomorphology; Pollen; Verbenaceae. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100147 |
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| Registros recuperados: 61 | |
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