Originally presented as the author's thesis, Universidad de Chile, Santiago, 1944. / Includes bibliographical references (p. [203]-209).

Bibliography: leaves 181-196. / 196, 44a leaves : ill. (some col.), maps ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Geology and Geophysics, 1994

Submitted by MARINA VITTI VIANNA null (marinavvianna@gmail.com) on 2016-07-18T13:13:27Z No. of bitstreams: 1 dissert-Marina-vfinal-Marina-Lara.pdf: 1520355 bytes, checksum: 30f9fad60558010a60aa7aadc9c7f67f (MD5) / Approved for entry into archive by Felipe Augusto Arakaki (arakaki@reitoria.unesp.br) on 2016-07-18T17:06:15Z (GMT) No. of bitstreams: 1 vianna_mv_me_rcla.pdf: 1520355 bytes, checksum: 30f9fad60558010a60aa7aadc9c7f67f (MD5) / Made available in DSpace on 2016-07-18T17:06:15Z (GMT). No. of bitstreams: 1 vianna_mv_me_rcla.pdf: 1520355 bytes, checksum: 30f9fad60558010a60aa7aadc9c7f67f (MD5) Previous issue date: 2016-07-04 / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Ambientes extremos são fontes potenciais para a descoberta de novos produtos naturais com propriedades específicas para aplicação biotecnológica, devido ao pouco conhecimento sobre a diversidade e os recursos genéticos dos micro-organismos que habitam esses locais. Micro-organismos do ambiente Antártico têm demonstrado potencial para produção de enzimas ativas em temperaturas brandas com aplicação em diversos setores de importância econômica. Neste contexto, o presente trabalho avaliou a produção de L-asparaginase e proteases produzidas por fungos filamentosos (n=161) e leveduras (n=137), isolados de oito diferentes amostras de solos da Antártica (coletados na expedição Antártica de nov/dez de 2013 no âmbito do INCT Criosfera). Os fungos filamentosos e as leveduras encontram-se preservados na coleção de pesquisa vinculada à Central de Recursos Microbianos da UNESP (CRM-UNESP). Um total de 101 (62,7%) fungos filamentosos apresentou potencial para produção da enzima L-asparaginase em meio sólido (triagem qualitativa), porém nos testes quantitativos em meio líquido a enzima não foi produzida nas condições utilizadas. Com relação às proteases, 121 (75,1%) fungos apresentaram halo de degradação em meio sólido e 30 (18.6%) isolados apresentaram resultados de atividade de proteases acima de 45,0 U/mL. Dentre eles, 13 (8,7%) foram capazes de produzir proteases acima 100,0 U/mL: sete isolados apresentaram atividade de proteases alcalina e seis de proteases ácidas. Os isolados 5BI (Aspergillus sp.) e 6 MP (Thelebolus sp.) se destacaram na produção de proteases ácidas e alcalinas, respectivamente, e foram submetidos ao planejamento experimental. Os resultados indicaram um aumento significativo na produção de proteases a 10ºC e 150 rpm: 7,41 vezes para a produção de proteases ácidas pelo fungo 5BI (1.810,0 U/mL) e 5,38 vezes (1.542,5 U/mL) para a produção de proteases alcalinas pelo fungo 6MP. Para ambos os isolados as condições aplicadas que resultaram nos valores máximos de produção de proteases foram validadas. Os resultados da avaliação da diversidade das 137 leveduras (MSP-PCR) revelaram a ocorrência de 22 táxons distintos distribuídos em 8 gêneros, com predominância de Cryptococcus (21,1%), Rhodotorula e Candida (20,4%). Outros gêneros menos predominantes encontrados foram: Cystofilobasidium (13,8%), Rhodosporidium (13,1%), Leucosporidium (8,7%), Guehomyces (6,5%), Debaryomyces (3,6%), Bulleromyces (2,9%) e Malassezia (2,1%). Com base nos índices de Simpson, Shannon e Chao o solo BI (solo de biofilme, Deception) foi o mais diverso e o que apresentou a maior riqueza. Análises dos parâmetros físico-quimicos dos solos e de diversidade revelaram proximidade entre os solos MP (solo embaixo de madeira podre, Deception), FE (solo embaixo de barra de ferro, Deception) e CG 4.0 (solo embaixo de camada de gelo, Rei George). O presente trabalho apresenta uma visão geral da diversidade de leveduras nos diferentes tipos de solos de Ilhas Antárticas e revela o potencial biotecnológico de fungos filamentosos para produção de proteases ácidas e alcalinas. / Extreme environments are potential sources for the discovery of new natural products with specific properties for biotechnological applications due to little knowledge about the diversity and genetic resources of microorganisms that inhabit these places. Microorganisms from the Antarctic environment have shown potential for producing active enzymes in mild temperatures with application in various sectors of economic importance. In this context, the present study evaluated the production of proteases and L-asparaginase by filamentous fungi (n= 161) and yeasts (n= 137) isolated from seven different samples of the Antarctic soils (collected in the Antarctic expedition Nov/Dec 2013 - INCT Cryosphere Project). The isolates are being maintained in the research collection linked to the Microbial Resource Center of UNESP (CRM-UNESP). A total of 101 (62.7%) filamentous fungi showed potential for production of L-asparaginase on solid medium (qualitative screening), but in the quantitative screening in liquid medium the enzyme was not produced. Concerning proteases production, 121 (75.1%) filamentous fungi presented halo of degradation on solid medium and 30 (18.6%) isolates showed protease activity above 45.0 U/mL Among them, thirteen (8.7%) isolates were able to produce protease above 100.0 U/mL: seven isolates produced alkaline proteases and six acid proteases. The isolates 5BI (Aspergillus sp.) and 6 MP (Thelebolus sp.) showed the best results in the production of acid and alkaline proteases, respectively, and were submitted to the experimental design. Results indicated a significant increase in protease production at 10 °C and 150 rpm: 7.41 times for the production of acid proteases by the fungus 5BI (1,810.0 U/mL) and 5.38 times (1,542.5 U/mL) for the production of alkaline proteases by the fungus 6MP. For both isolates the conditions applied for the maximum production of proteases were validated. Results related to the assessment of the diversity of the 137 yeasts (MSP-PCR) revealed the presence of 22 different taxa, especially the genera Cryptococcus (21.1%), Rhodotorula e Candida (20.4%). Other less prevalent genera found were: Cystofilobasidium (13.8%), Rhodosporidium (13.1%), Leucosporidium (8.7%), Guehomyces (6.5%), Debaryomyces (3.6%), Bulleromyces (2.9%), and Malassezia (2.1%). Based on the Simpson, Shannon and Chao indexes, the soil BI (biofilm soil, Deception Island) was the most diverse and presented the greatest richness. Analysis of physicochemical parameters of the soils and their diversity revealed that MP (soil under rotten wood, Deception), FE (soil under iron bar, Deception), and GC 4.0 (soil under layer ice, King George) are closed related. The present work presents an overview of the diversity of yeast in different types of soils from Antarctic Islands and reveals the biotechnological potential of filamentous fungi for the production of acid and alkaline proteases. / FAPESP: 2014/10207-4

The dynamics of the polar mesosphere and lower thermosphere ( MLT ) is investigated using MF radars at Davis ( 69 ° S, 78 ° E ), Syowa ( 69 ° S, 40 ° E ) and Rothera ( 68 ° S, 68 ° W ) in the Antarctic, and Poker Flat ( 65 ° N, 147 ° W ) and Andenes ( 69 ° N, 16 ° E ) in the Arctic. Mean winds and gravity waves are investigated on a climatological scale and also during sudden stratospheric warmings. Mean wind climatologies in the MLT show differences that are often hemispheric in nature. For example, summer peaks in westward and equatorward winds occur earlier ( closer to the solstice ) in the Antarctic than in the Arctic. The greater symmetry around the solstice of phenomena such as these indicates that radiative effects may play a greater role in controlling the state of the Antarctic MLT than in the Arctic, where dynamical effects might be more important. Gravity wave observations are consistent with this theory, suggesting more wave drag may occur in the Arctic MLT. The equatorward jet persists for about 2 weeks later in summer in the Arctic than in the Antarctic, as do satellite observations of polar mesospheric clouds ( PMCs ) ( a temperature dependent phenomenon ). It is proposed that the meridional winds can be used as a proxy for gravity wave driving and consequent adiabatic cooling in the MLT. VHF radar observations of polar mesospheric summer echoes ( PMSEs ) at Davis, and the satellite PMC observations, both occur at a similar time to the equatorward jet. Seasonal variations in gravity wave activity are generally a combination of annual ( with winter maxima and summer minima ) and semi - annual ( with maxima near the solstices and minima near the equinoxes ) components. The winter maxima and spring / summer minima both occur about 3 weeks later in the Antarctic than in the Arctic, with the difference in magnitude between these extrema being about 90 % larger in the Antarctic. The available MF radar data include six major sudden stratospheric warmings in the northern hemisphere, and the unprecedented southern event which occurred during 2002 splitting the Antarctic ozone hole apart. Three of the six northern events are relatively weak and could almost be classed as minor warmings, while the larger three are similar in strength and duration to the southern event. Gravity wave activity reduces dramatically at Davis during the southern event, but not at Syowa ( possibly due to differences in critical level filtering ). The influence of major warmings on mesospheric gravity wave strength and polarisation varies significantly between locations, and individual events. Zonal wind reversals associated with the large major warmings are all weaker and occur earlier in the mesosphere than in the stratosphere. Another hemispherically common response is zonal wave - 1 planetary wave signatures in the mesospheric meridional winds ( i.e., a flow over the pole ). The planetary wave signatures have 14 - day periodicity and are westward propagating leading up to the southern event. The zonal winds are weaker than average during the 2002 southern winter, and also during the transition to the summer circulation. This is not seen for the large northern major warmings. There appears to be both hemispheric similarities and differences in polar middle atmosphere dynamics during stratospheric warmings, and also on a climatological scale. / Thesis (Ph.D.)--School of Chemistry and Physics, 2005.

The dynamics of the polar mesosphere and lower thermosphere ( MLT ) is investigated using MF radars at Davis ( 69 ° S, 78 ° E ), Syowa ( 69 ° S, 40 ° E ) and Rothera ( 68 ° S, 68 ° W ) in the Antarctic, and Poker Flat ( 65 ° N, 147 ° W ) and Andenes ( 69 ° N, 16 ° E ) in the Arctic. Mean winds and gravity waves are investigated on a climatological scale and also during sudden stratospheric warmings. Mean wind climatologies in the MLT show differences that are often hemispheric in nature. For example, summer peaks in westward and equatorward winds occur earlier ( closer to the solstice ) in the Antarctic than in the Arctic. The greater symmetry around the solstice of phenomena such as these indicates that radiative effects may play a greater role in controlling the state of the Antarctic MLT than in the Arctic, where dynamical effects might be more important. Gravity wave observations are consistent with this theory, suggesting more wave drag may occur in the Arctic MLT. The equatorward jet persists for about 2 weeks later in summer in the Arctic than in the Antarctic, as do satellite observations of polar mesospheric clouds ( PMCs ) ( a temperature dependent phenomenon ). It is proposed that the meridional winds can be used as a proxy for gravity wave driving and consequent adiabatic cooling in the MLT. VHF radar observations of polar mesospheric summer echoes ( PMSEs ) at Davis, and the satellite PMC observations, both occur at a similar time to the equatorward jet. Seasonal variations in gravity wave activity are generally a combination of annual ( with winter maxima and summer minima ) and semi - annual ( with maxima near the solstices and minima near the equinoxes ) components. The winter maxima and spring / summer minima both occur about 3 weeks later in the Antarctic than in the Arctic, with the difference in magnitude between these extrema being about 90 % larger in the Antarctic. The available MF radar data include six major sudden stratospheric warmings in the northern hemisphere, and the unprecedented southern event which occurred during 2002 splitting the Antarctic ozone hole apart. Three of the six northern events are relatively weak and could almost be classed as minor warmings, while the larger three are similar in strength and duration to the southern event. Gravity wave activity reduces dramatically at Davis during the southern event, but not at Syowa ( possibly due to differences in critical level filtering ). The influence of major warmings on mesospheric gravity wave strength and polarisation varies significantly between locations, and individual events. Zonal wind reversals associated with the large major warmings are all weaker and occur earlier in the mesosphere than in the stratosphere. Another hemispherically common response is zonal wave - 1 planetary wave signatures in the mesospheric meridional winds ( i.e., a flow over the pole ). The planetary wave signatures have 14 - day periodicity and are westward propagating leading up to the southern event. The zonal winds are weaker than average during the 2002 southern winter, and also during the transition to the summer circulation. This is not seen for the large northern major warmings. There appears to be both hemispheric similarities and differences in polar middle atmosphere dynamics during stratospheric warmings, and also on a climatological scale. / Thesis (Ph.D.)--School of Chemistry and Physics, 2005.

Submitted by Nathália Faria da Silva (nathaliafsilva.ufv@gmail.com) on 2017-06-29T19:42:36Z No. of bitstreams: 1 texto completo.pdf: 5192286 bytes, checksum: 21821e861310703fd29edb04c2b73d7c (MD5) / Made available in DSpace on 2017-06-29T19:42:36Z (GMT). No. of bitstreams: 1 texto completo.pdf: 5192286 bytes, checksum: 21821e861310703fd29edb04c2b73d7c (MD5) Previous issue date: 2005-11-07 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / As áreas de nidificação de aves na Antártica Marítima são ecossistemas bastante peculiares que ocorrem ao longo da costa em diversas ilhas do arquipélago das Shetlands do Sul. Na área de entorno da estação de campo Americana Pieter J. Lenie, localizada na Ilha Rei George, Antártica Marítima, a natureza do material orgânico, da vegetação, das diferentes classes de solos e os processos pedogenéticos atuantes em solos sob a influencia de aves em ecossistemas costeiros na ilha Rei George, foram estudados. O estudo foi realizado como parte do Projeto Criossolos Austrais: solos criogênicos da Antártica - distribuição, ciclagem biogeoquímica, seqüestro de carbono e retenção de metais pesados – CRIOSSOLOS; servindo de subsídio para o monitoramento ambiental dos ecossistemas costeiros da Baia do Almirantado. Os trabalhos foram conduzidos nos laboratórios do Departamento de Solos da Universidade Federal de Viçosa, a partir das amostras coletadas durante as XXI e XXII Operações Antárticas Brasileiras. Os solos apresentaram grande variabilidade nas propriedades físico-químicas em função da grande variação e mistura de materiais de origem, e dos diferentes graus de influencia ornitogènica. A geomorfologia é composta principalmente de morainas suavizadas pelo tempo e vastos terraços marinhos, e a paisagem apresenta- se altamente alterada pela intensa nidificação após a última glaciação. A cobertura vegetal, constituída principalmente de líquens e briófitas, apresentaram distribuição estreitamente relacionada com o relevo, solos e aporte nutricional oriundo das atividades ornitogênicas. Os solos neste ecossistema são rasos, arenosos, em sua maioria ácidos, ricos em nutrientes com destaque para P e Ca 2+ . Em virtude do clima severo, a decomposição da matéria orgânica é lenta, ocorrendo grande acumulo e migração de substâncias húmicas no solo. Estas pos sua vez passam a desempenhar um importante papel na retenção da água de degelo e complexação de metais. A área em estudo mostra elevada variedade pedogenética evidenciando, porém o predomínio de tipos de terreno derivados de intemperísmo físico recente. Há ocorrência de Fluvissolos Gélicos, Criossolos Ornitogênicos Túrbicos, Criossolos Ornitogênicos Gleicos. , entre outros solos afetados por permafrost. A fosfatização se faz representativa como processo pedogenético diretamente atuante, o tamanho da população de P. adélia e o tempo de colonização, após a última glaciação garantiram a fertiização com posterior fosfatização de extensas áreas no entorno da Ponta Llano. Observou-se o predomínio de material fíbrico no material orgânico dos solos analisados, no extrato alcalino ocorreu predomínio das frações menos humificadas, com maior mobilidade. Estas características conferem baixa estabilidade destes compostos, preservados apenas pelas condições edafo climáticas locais. Os valores de carbono imobilizados nos arredores da Ponta Llano, apesar de elevados, representam um estoque total modesto, entretanto o sistema parece apresentar um balanço positivo, com seqüestro contínuo para o solo, principal compartimento de seqüestro de carbono orgânico nos ecossistemas terrestres. Os solos estudados não são passíveis de classificação no atual Sistema Brasileiro de Classificação de Solos (EMBRAPA, 1999). Isto se dá pela inexistência de formalização para solos afetados por permafrost em nível categórico elevado, e pela inexistência de conceituação em níveis mais baixos. Em reposta a demanda crescente de pesquisadores das mais diferentes áreas na Antártica e a expansão da pedologia periglacial brasileira, é oportuno a Sociedade Brasileira de Ciência do Solo a inclusão no Sistema Brasileiro de Classificação de Solos de uma nova classe que abranja os solos afetados por permafrost. A área apresenta-se preservada, pouco afetada pela atividade humana, podendo ser considerada um ponto estratégico para o monitoramento dos impactos locais e globais sobre a flora e fauna. / In terrestrial ecosystems of Maritime Antarctica (King George) Island, the transference of primary marine production to the land promoted by penguins and other birds, appears to influence soil formation and chemical weathering to a greater extent than formerly predicted. This work summarizes the results of pedological investigations on the vicinity of the American Pieter J. Lenie Field Station (62o10’S-58o28’W), discussing soil formation processes related to vegetation succession, and carbon dynamics in the studied area. Soil organic matter accumulation and associated phosphatization are marked soil-forming processes in ice-free areas once colonized by penguins. Also there is a high correlation between soil development and vegetation patterns. Nutrient supply in these cryogenic soils is affected by low pH following xvnitrification and high contents of phosphorus, potassium, calcium and magnesium due to seabirds inputs. Gelic Fluvisols, (Psammentic Aquiturbels); Ornitogenic Turbic Cryosols, (Glacic Haploturbels); Ornitogenic Gleyic Cryosols (Ornitogenic Gelic Fluvisols), are the most common soils. In all soils phosphatization and ornithogenesis occurs in varying degrees. However, Soil Taxonomy nor the World Reference Base for Soil Resources consider the influence of ornithogenesis or phosphatization in its framework, so that a more detailed classification of such soils is not possible.

Memoria para optar al título profesional de Ingeniero Agrónomo / Se estudió el efecto de la cobertura arbórea sobre la conducta y peso vivo de bovinos en pastoreo durante el periodo invernal (Junio- Octubre), en la Región de Magallanes. La investigación se llevó a cabo en el sector Tranquilo (51º 56` S; 72º 6` O), lugar en el cual se seleccionaron 2 parcelas experimentales de similar superficie, una de ellas presentaba una superficie deforestada y la otra poseía una cobertura arbórea del 40%. En cada parcela se situaron 5 vaquillas, seleccionadas por poseer similares pesos y edades, y se realizó un control del de peso vivo y del comportamiento a lo largo del estudio. La cobertura arbórea influyó positivamente en el peso de los animales, así aquellos que contaban con protección arbórea redujeron su peso vivo, en promedio, en un 9%, durante el periodo más frio (Junio- Septiembre), en cambio, los animales que no presentaban protección arbórea perdieron en promedio un 15% de su peso en igual periodo. Respecto a la conducta, durante el periodo caracterizado por condiciones climáticas más severas, los animales de la parcela con cobertura arbórea destinaron cerca de un 20% más tiempo a comer que sus pares de la parcela sin cobertura y, dedicaron cerca de un 15% menos tiempo a caminar. Estas diferencias apoyan lo expresado por los pesos vivos de los animales en que los animales favorecidos por la cobertura arbórea presentaron menores pérdidas de peso. La información obtenida permite concluir que la cobertura arbórea de la parcela reduce las pérdidas de peso vivo de los animales pastoreando en su área de influencia, además afecta la conducta de los animales reduciendo el tiempo destinado a desplazarse y aumenta las horas para comer. / Arboreal coverage effect over grazing bovines behavior and live weight was studied during winter (June – October), in the Region of Magallanes. Research was developed in the Tranquilo area (51º 56` S; 72º 6` O), where two experimental lots of similar areas were selected, one presenting a deforested surface and the other with a 40% arboreal coverage. In each lot 5 heifers were allotted, after being selected to match similar ages and weight. Live weights, as well as their behavior were controlled during the study. Tree coverage positively influenced the animals weight, those with arboreal protection during the coldest period (June – September) reduced their live weight in average about 9%, whereas those animals without protection, lost in average 15% of their live weight. In relation to behavior during the most severe climatic period, animals with arboreal coverage devoted about 20% more time to eat than those animals without coverage, and took 15% less time walking. These differences support the results obtained in the live weights of the animals, were those with coverage presented lower weight loss. From the obtained information, it can be concluded that partial arboreal coverage of grassland reduces live weight losses, in animals grazing under its influence, also affecting their behavior by reducing the time they devote to walk or wander in the lot and, increasing the feeding space of time they.

Neste trabalho a variabilidade climatica do oceano Austral e a ocorrencia da Onda Circumpolar Antartica (OCA) sao investigadas. Foram usados os dados de uma simulaçao do modelo numerico acoplado do Nacional Centre for Atmospheric Research/ Community System Model - NCAR CCSM de 150 anos, e um conjunto de dados climatologicos como base de comparaçao dos dados do modelo. estes foram obtidos da Re-analise do NCEP/NCAR (National Center for Envirommental Prediction) para o periodo de janeiro de 1948 a julho de 2002. Com o intuito de analisar o comportamento sazonal e anual foram analisadas as climatologias e utilizada a tecnica de analise harmonica das variaveis de temperatura da superficie do mar (TSM), pressao ao nivel do mar (PNM), componentes meridional (Vy) e zonal (Vx) do vento. Para analisar o comportamento interanual dessas variaveis sao utilizados diagramas Hovmoeller, espectros de potencia, alem de tecnicas estatisticas como Empirical Ortogonal Functions (EOF) e singular Value Decomposition (SVD). / In this study the climatic variability of the Southern ocean and the Antarctic Circumpolar Wave (ACW) are investigated. The National Center for Atmospheric Research/ Community System Model _ NCAR CCSM coupled model 150 years simulation data is compered with the climatology data from the Nacional Center for Envirommental Prediction - NCEP/NCAR Re-analysis, for a period from january/1948 until july/2002. Annual and seasonal climatology and harmonic analysis are used for the following variables: sea surface temperature (SST), sea level pressure (SLP), meridional and zonal wind. Hovmoeller diagrams, potencial spectra and statistics methods such as Empirical Ortogonal Functions (EOF) and Singular Value Decomposition (SVD) are used to analyze changes in interannual behavior of this variables.

Neste trabalho a variabilidade climatica do oceano Austral e a ocorrencia da Onda Circumpolar Antartica (OCA) sao investigadas. Foram usados os dados de uma simulaçao do modelo numerico acoplado do Nacional Centre for Atmospheric Research/ Community System Model - NCAR CCSM de 150 anos, e um conjunto de dados climatologicos como base de comparaçao dos dados do modelo. estes foram obtidos da Re-analise do NCEP/NCAR (National Center for Envirommental Prediction) para o periodo de janeiro de 1948 a julho de 2002. Com o intuito de analisar o comportamento sazonal e anual foram analisadas as climatologias e utilizada a tecnica de analise harmonica das variaveis de temperatura da superficie do mar (TSM), pressao ao nivel do mar (PNM), componentes meridional (Vy) e zonal (Vx) do vento. Para analisar o comportamento interanual dessas variaveis sao utilizados diagramas Hovmoeller, espectros de potencia, alem de tecnicas estatisticas como Empirical Ortogonal Functions (EOF) e singular Value Decomposition (SVD). / In this study the climatic variability of the Southern ocean and the Antarctic Circumpolar Wave (ACW) are investigated. The National Center for Atmospheric Research/ Community System Model _ NCAR CCSM coupled model 150 years simulation data is compered with the climatology data from the Nacional Center for Envirommental Prediction - NCEP/NCAR Re-analysis, for a period from january/1948 until july/2002. Annual and seasonal climatology and harmonic analysis are used for the following variables: sea surface temperature (SST), sea level pressure (SLP), meridional and zonal wind. Hovmoeller diagrams, potencial spectra and statistics methods such as Empirical Ortogonal Functions (EOF) and Singular Value Decomposition (SVD) are used to analyze changes in interannual behavior of this variables.

Geólogo / Los afloramientos pertenecientes a la Formación Dorotea en el valle del río Las Chinas, registran una somerización de la Cuenca de Magallanes ocurrida en el Maastrichtiano y un abundante contenido fosilífero. Mediante el reconocimiento de facies sedimentarias fueron interpretadas asociaciones de facies deltaicas que comprenden el prodellta, frente deltaico, planicie deltaica y depósitos de canales fluviales. Un estudio de estratigrafía secuencial aplicado a las tipos de superficies, patrones de apilamientos y alternancia de facies, logro determinar que la Formación Dorotea se compone de 4 secuencias, S1 que es asociada a depósitos de frente deltaico, con influencia fluvial y de oleaje, S2 con escasos afloramientos, S3 que corresponde a la más continental, representa alternancia entre ambientes de frente deltaico y planicie deltaica con incisión de causes fluviales y un gran registro de improntas foliares excelentemente conservadas y S4, que representa una transgresión desde facies de planicie deltaica, que contienen desde un bonebed de hadrosaurios, a facies marino someras con reptiles marinos y Ambigostrea sp., fósil guía del Maastrichtiano. Se atribuye a las oscilaciones eustáicas un control mixto, tanto tectónico local ,como global atribuido a un descenso de la temperatura desde el Campaniano.