A Prodeltaic System Controlled By Hyperpycnal Flows And Storm Waves: Reinterpretation Of The Punta Negra Formation (lower-middle Devonian, Argentine Precordillera)

The Punta Negra Formation (FPN) constitutes a Lower-Middle Devonian sandstone unit located in the Argentine Precordillera. Based on detailed facies and ichnological analyses, this unit, which had been previously interpreted as a deep-water system, has been reinterpreted in this study as a prodelta system, in which the distribution and sedimentation of the clastic deposits were controlled by hyperpycnal flows associated with storms. Five lithofacies attest the deposition by unidirectional hyperpycnal flows combined with storm-generated oscillatory flows. Fossil traces testify variable energetic conditions of the depositional system with the colonization of opportunistic organisms immediately after the deposition of high energy combined flows and the colonization of more specialized organisms during the long low-energy periods. Three architectural elements, deposited from coastline to offshore, have been recognized: 1) Channelized sandstone, composed of the thickest and coarsest sandstone beds and interpreted as the proximal portion deposited close to the mouth of the distributaries of the delta system; 2) Tabular sandstone, which are composed of combined and oscillatory flow deposits with lesser thickness, grain size and spacing of the undulated bed forms; 3) Tabular sandstone interbedded to mudstone, which represents the most distal architectural element and is composed of thin sandstone and thicker mudstone strata, deposited by low-energy combined flows.434673694Allen, J.R.L., (1984) Sedimentary Structures: Their Character and Physical Basis, p. 663. , Amsterdam, ElsevierArnott, R.W.C., Quasi-planar-laminated sandstone beds of the Lower Cretaceous Bootlegger Member, north-central Montana: Evidence of combined-flow sedimentation (1993) Journal of Sedimentary Petrology, 63 (3), pp. 488-494Arnott, R.W.C., Southard, J.B., Exploratory flow-duct experiments on combined flow bed configurations, and some implications for interpreting storm-event stratification (1990) Journal of Sedimentary Petrology, 60, pp. 211-219Basilici, G., De Luca, P.H.V., Oliveira, E.P., A depositional model for a wave-dominated open-coast tidal flat, based on analyses of the Cambrian-Ordovician Lagarto and Palmares formations, northeastern Brazil (2012) Sedimentology, 59, pp. 1613-1639Basilici, G., De Luca, P.H.V., Poiré, D.G., (2012) Hummocky Crossstratification-Like Structures and Combined-flow Ripples in the Punta Negra Formation (Lower-Middle Devonian, Argentine Precordillera): A Turbiditic Deep-water or Storm-dominated Prodelta Inner-shelf System?, pp. 73-92. , Sedimentary Geology 267-268Baucon, A., Neto De Carvalho, C., From the river to the sea: Pramollo a new ichnolagerstätte from the Carnic Alps (Carboniferous, Italy-Austria) (2008) Studi Trentini di Scienze Naturali Acta Geologica, 83, pp. 87-114Bhattacharya, H.N., Bhattacharya, B., Storm event beds in a Paleoproterozoic Rift Basin, Aravalli Supergroup, Rajasthan, India (2005) Gondwana Research, 8 (2), pp. 231-239. , DOI 10.1016/S1342-937X(05)71121-7Bhattacharya, H.N., Bhattacharya, B., Chakraborty, I., Chakraborty, A., Sole marks in storm event beds in the Permo-Carboniferous Talchir Formation, Raniganj Basin, India (2004) Sedimentary Geology, 166 (3-4), pp. 209-222. , DOI 10.1016/j.sedgeo.2003.12.003, PII S0037073803003713Brenchley, P.J., Newall, G., Storm-influenced inner-shelf sand lobes in the Caradoc (Ordovician) of Shropshire, England (1982) Journal of Sedimentary Petrology, 52, pp. 1257-1269Bridge, J.S., Description and interpretation of fluvial deposits: A critical perspective (1993) Sedimentology, 40 (4), pp. 801-810Buatois, L., Mángano, M.G., (2011) Ichnology: Organism-Substrate Interactions in Space and Time, p. 358. , Cambridge, Cambridge. 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Development and testing of a new instrument to measure self-care in patients with osteoporosis: the self-care of osteoporosis scale

Purpose: The aim of this study was to develop and test the Self-Care of Osteoporosis Scale (SCOS), a new instrument to measure self-care in postmenopausal women with osteoporosis. Methods: A cross-sectional study was conducted. The SCOS was developed by a panel of experts and it was theory-driven. Confirmatory factor analysis (N = 544) was used to test the instrument’s factorial validity; Cronbach’s alpha and McDonald’s omega were used to derive the measure’s internal consistency reliability; an intraclass correlation coefficient was used to evaluate test-retest reliability. Results: Confirmatory factor analysis resulted in supportive fit indices for the hypothesized three-factor structure of the SCOS (RMSEA = 0.065; CFI = 0.99). The SCOS was demonstrated to have content validity, internal consistency and test-retest reliability. Conclusions: The SCOS demonstrated excellent psychometric characteristics in terms of validity and reliability. It may be used by healthcare providers to identify if patients show lower self-care and require educational interventions

Climatic and geomorphologic cycles in a semiarid distributive fluvial system, Upper Cretaceous, Bauru Group, SE Brazil

Studies of distributive fluvial systems and their preserved successions envisage the distribution and orientation of architectural elements to be primarily controlled by channels radiating outward from fan apices, in many cases along an elongate basin margin. Conceptual models for such systems account for the downstream dynamics of the fluvial network, but with limited consideration of temporal geomorphic variations, resulting vertical organisation of architectural elements, or of the interplay of factors controlling system dynamics. To understand the external and internal architecture of distributive fluvial systems, and the factors that influence their sequential facies organisation, a sedimentary succession of the proximal portion of an Upper Cretaceous, semiarid, distributive fluvial system, located at the north-eastern margin of the Bauru Basin (Southeast Brazil), has been analysed in detail. Three fining- and thinning-upward fluvial sequences are identified, forming an interval separated at the top and the bottom by two palaeosol profiles. Each sequence is formed of channel and floodplain deposits. Two types of channel deposits are identified. One is composed of stacked sets of small-scale dune deposits, suggesting perennial and steady fluvial regime, associated with more humid climate periods. The other is composed of large-scale sets indicative of flattened dunes associated with unsteady and fast-changing fluvial flow, formed in quasi-supercritical flow regime conditions, associated with drier climate periods. The vertical alternation of these two types of channel deposits records the accumulation of a fluvial succession that responded to high-frequency, climate-induced cyclic change in bounding conditions. Two palaeosol profiles, at the top and at the bottom of the succession, indicate temporary interruptions and cessation of the fluvial sedimentation, likely related to avulsion of the fluvial belt. Thus, the studied succession reveals high-frequency climate-induced allogenic sedimentary cycles that occur within a long-period autogenic geomorphologic-induced sedimentary cycle. This work suggests that the internal architecture of the channel deposits can be used as a climate proxy, and that climate and geomorphology act jointly as notable factors to control the vertical organisation of distributive fluvial systems

First titanosaur dinosaur nesting site from the Late Cretaceous of Brazil

Titanosaurs were successful herbivorous dinosaurs widely distributed in all continents during the Cretaceous, with the major diversity in South America. The success of titanosaurs was probably due to several physiological and ecological factors, in addition to a series of morphological traits they achieved during their evolutionary history. However, the generalist nesting behaviour using different palaeoenvironments and strategies was key to accomplish that success. Titanosaur nesting sites have been found extensively around the world, with notable records in Spain, France, Romania, India, and, especially, Argentina. Here, we describe the first titanosaur nesting site from the Late Cretaceous of Brazil that represents the most boreal nesting site for South America. Several egg-clutches, partially preserved, isolated eggs and many eggshell fragments were discovered in an Inceptisol palaeosol profile of the mining Lafarge Quarry, at the Ponte Alta District (Uberaba Municipality, Minas Gerais State), corresponding to the Serra da Galga Formation (Bauru Group, Bauru Basin). Although classical mechanical preparation and CT scans have not revealed embryonic remains in ovo, the eggs and eggshell features match those eggs containing titanosaurian embryos found worldwide. The morphology of the egg-clutches and observations of the sedimentary characteristics bolster the hypothesis that these sauropods were burrow-nester dinosaurs, as was already suggested for the group based on other nesting sites. The egg-clutches distributed in two levels along the Lafarge outcrops, together with the geopalaeontological data collected, provide clear evidence for the first colonial nesting and breeding area of titanosaur dinosaurs in Brazil.Fil: Fiorelli, Lucas Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; ArgentinaFil: Martinelli, Agustín Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Universidade Federal do Triângulo Mineiro; BrasilFil: da Silva, João Ismael. Prefeitura Municipal de Uberaba; Brasil. Universidade Federal do Triângulo Mineiro; BrasilFil: Hechenleitner, Esteban Martín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina. Universidad Nacional de La Rioja; ArgentinaFil: Soares, Marcus Vinícius Theodoro. Universidade Estadual de Campinas; BrasilFil: Silva Junior, Julian C. G.. Universidade de Sao Paulo; Brasil. Universidade Federal do Triângulo Mineiro; BrasilFil: da Silva, José Carlos. Associação Brasileira dos Criadores de Zebu; BrasilFil: Borges, Élbia Messias Roteli. Escola Estadual Presidente João Pinheiro; BrasilFil: Borges Ribeiro, Luiz Carlos. Universidade Federal do Triângulo Mineiro; Brasil. Associação Brasileira dos Criadores de Zebu; BrasilFil: Marconato, André. Universidade de Sao Paulo; BrasilFil: Basilici, Giorgio. Universidade Estadual de Campinas; Brasil. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; ArgentinaFil: da Silva Marinho, Thiago. Universidade Federal do Triângulo Mineiro; Brasi

Depositional Mechanisms And Architecture Of A Pre-early Cambrian Mixed Sand-mud Deepwater Ramp (apiúna Unit, South Brazil)

The Apiúna Unit is located in the south of Brazil, in the State of Santa Catarina. It is a deepwater depositional system, which is part of the sedimentary fill of the Itajaí Basin, pre-early Cambrian in age, interpreted as a foredeep basin. We have described and interpreted the depositional mechanisms according to the terminology proposed by Mulder and Alexander [Mulder, T., Alexander, J., 2001. The Physical Character of Subaqueous Sedimentary Density Flows and their Deposits. Sedimentology 48 (2), 269-299] and have recognized seven architectural elements. The Apiúna Unit is interpreted as a mixed sand-mud deepwater ramp system. The slope deposits are characterized by laminated argillite with slumped beds. The proximal and medial ramp is characterized by channel-levee systems. The distal ramp shows sandstone sheet, which pass distally into interlayered sandstone/pelite. The sequence development of this ramp unit differs from other known ancient ramp systems. The Apiúna Unit shows at least five phases of sandy input, recording times of progradation or retrogradation of the ramp, interstratified with muddy deposits, related to sand-starved phases. In the upper part of the succession, the ramp building was interrupted and the sandy deposits are replaced by pelitic slope deposits. The depositional mechanisms have a direct relationship to the architectural elements and the regions of the depositional system. Settling, very low-density turbidity currents and slumps formed the slope deposits. Channel deposits are formed by debris flows, hyperconcentrated density flows and concentrated density flows, in that vertical sequence order. Levee deposits were made of surge-like turbidity flows. Proximal sandstone sheet deposits were formed by concentrated density flows. Distal sandstone sheet deposits are formed by concentrated density flows and surge-like turbidity flows. Surge-like turbidity flows and quasi-steady (?) turbidity flows formed the interchannel deposits. © 2006 Elsevier B.V. All rights reserved.18703/04/15183204Clark, J.D., Pickering, K.T., (1996) Submarine Channels, Processes and Architecture, p. 231. , Vallis Press EdsFischer, R.V., Flow transformations in sediment gravity flows (1983) Geology, 11, pp. 273-274Friend, P.F., Towards the field classification of alluvial architecture or sequence (1983) Int. Assoc. Sedimentol. Spec. Publ., 6, pp. 345-354. , Modern and Ancient Fluvial Systems. Collinson J.D., and Lewin J. (Eds)Galloway, W.E., Siliciclastic slope and base-of-slope depositional systems: component facies, stratigraphic architecture, and classification (1998) Am. Assoc. Petrol. Geol. Bull., 82 (4), pp. 569-595Heller, P.H., Dickinson, W.R., Submarine ramp facies model for delta-fed, sand-rich turbidite systems (1985) Am. Assoc. Petrol. Geol. Bull., 69 (6), pp. 960-976Hiscott, R.N., Deep-sea fan deposits in the Macigno Formation (middle-upper Oligocene) of Gordana Valley, northern Appennines, Italy-Discussion (1981) J. Sediment. Petrol., 51, pp. 1015-1021Hiscott, R.N., Traction-carpet stratification in turbidites-fact or fiction? (1994) J. Sediment. Res., A64, pp. 204-208Hiscott, R.N., Middleton, G.V., Depositional mechanisms of thick-bedded sandstones at the base of a submarine slope, Tourelle Formation (Lower Ordovician), Quebec, Canada (1979) Society of Economic Paleontologists and Mineralogists, Special Publication, 27, pp. 307-326. , Geology of Continental Slopes. Doyle L.J., and Pilkey O.H. (Eds)Johnson, S.D., Flint, S., Hinds, D., Wickens, H., De, V., Anatomy, geometry and sequence stratigraphy of basin floor to slope turbidite systems, Tanqua Karoo, South Africa (2001) Sedimentology, 48 (5), pp. 987-1023Kneller, B.C., Beyond the turbidite paradigm: physical models for deposition of turbidites and their implications for reservoir prediction (1995) Geol. Soc. London, Spec. Publ., 94, pp. 31-49. , Characterization of Deep Marine Clastic Systems. Hartley A.J., and Prosser D.J. (Eds)Kneller, B.C., Branney, M.J., Sustained high-density turbidity currents and the deposition of thick massive beds (1995) Sedimentology, 42, pp. 607-616Lowe, D.R., Sediment gravity flows: II. Depositional models with special reference to the deposits of high-density turbidity currents (1982) J. Sediment. Petrol., 52, pp. 279-297Macedo, M.H.F., Basei, M.A.S., Bonhome, M.G., Kawashita, K., Dados geocronológicos referentes às Rochas Metasedimentares do Grupo Itajaí (SC) (1984) Rev. Bras. Geocienc., 14 (1), pp. 30-34Major, J.J., Depositional processes in large-scale debris-flows experiments (1997) J. Geol., 105, pp. 345-366Mulder, T., Alexander, J., The Physical Character of Subaqueous Sedimentary Density Flows and their Deposits (2001) Sedimentology, 48 (2), pp. 269-299Mutti, E., (1992) Turbidite Sandstone, p. 276. , Agip Spa, MilanoMutti, E., Normark, W.R., Comparing examples of modern and ancient turbidite systems: problems and concepts (1987) Marine Clastic Sedimentology: Concepts and Cases Studies, pp. 1-38. , Legget J.K., and Zuffa G.G. (Eds), Graham and Trotman, LondonMutti, E., Ricci Lucchi, F., Le torbiditi dell'Appennino settentrionale: introduzione all'analisi di facies (1972) Mem. Soc. Geol. Ital., 11, pp. 161-199Mutti, E., Tinterri, R., Remacha, E., Mavilla, N., Angella, S., Fava, L., An introduction to the analysis of ancient turbidite basins from an outcrop perspective (1999) AAPG (Continuing Education Course Note Series), 39, p. 61Nelson, C.H., Maldonado, A., Factors controlling depositional patterns of ebro turbidite systems, Mediterranean Sea (1988) AAPG Bull., 72 (6), pp. 698-716Paim, P.S.G., Leipnitz, I., Da Rosa, A.L.Z., Da Rosa, A.A.S., Preliminary report on the occurrence of Chancelloria sp. in the Itajaí Basin, Southern Brazil (1997) Rev. Bras. Geocienc., 27 (3), pp. 303-308Pickering, K., Stow, D., Watson, M., Hiscott, R., Deep-water facies, processes and models: a review and classification scheme for modern and ancient sediments (1986) Earth-Sci. 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Transition Of Ephemeral Palustrine To Aeolian Deposits In A Continental Arid - Semi-arid Environment (upper Cretaceous Bauru Basin, Brazil)

In this work, we examine the transition from an ephemeral palustrine to a desertic sand sheet depositional system, corresponding to the Araçatuba Formation and Vale do Rio do Peixe Formation, respectively. These Upper Cretaceous formations form the lower part of the sedimentary sequence that fills the intracratonic Bauru Basin in the South American Platform (southeast Brazil). The transition between the two formations is through paleosols located at the top of the Araçatuba Formation, which have different spatial and temporal evolutions. In the inner, southern, and western parts of the Araçatuba Formation area, the paleosols are well developed, while in the outer, northern and eastern parts they are less developed. In the inner area, the mature paleosols are in sharp contact with the overlying deposits of the Vale do Rio do Peixe Formation, while in the outer area, immature paleosol successions in which sedimentary and pedogenetic features are interlayered represent the transition. Ghosts of sedimentary structures in the outer paleosols allow us to attribute the variations in paleosol development to different sedimentary inputs. In the outer part, a slow but continuous supply of sediment caused continuous rejuvenation of the soils, whereas in the inner portion the absence of sedimentary input allowed very mature soils to form. The transition between Araçatuba and Vale do Rio do Peixe formations may thus be explained by a sudden increase in sedimentation in the area, probably triggered by tectonic uplift in northern and eastern parts of the Bauru Basin, causing the progradation of alluvial fans of the Marília Formation, which supplied sediments to the sand sheet depositional system of the Vale do Rio do Peixe Formation. © 2008 Elsevier Ltd. All rights reserved.303605614Allen, J.R.L., Wright, V.P., (1989) Paleosols in Siliciclastic Sequences, , University of Reading, Postgraduate Research Institute for Sedimentology 97 ppBirkeland, P.W., (1984) Soils and Geomorphology, , Oxford University Press, Oxford 372 ppCoimbra, A.M., 1976. Arenitos da Formação Bauru: estudo de áreas fonte. Universidade de São Paulo, Instituto de Geociências, São Paulo, v. I 60 pp., v. II, 63 pp. [unpublished Msc. postgraduate research]Etchebehere, M.L.C., Saad, A.R., Taddeo, J.S.A., Hellmeister, Z., Moldes de cristais salinos no Grupo Bauru, Estado de São Paulo: implicações econômicas e paleoclimáticas (1991) Geociências, 10, pp. 101-117Fernandes, L.A., 1998. Estratigrafia e evolução geológica da parte oriental da Bacia Bauru (Ks, Brasil). Universidade de São Paulo, Instituto de Geociências: São Paulo., 216 pp + 3 maps. [unpublished, Ph.D. thesis]Fernandes, L.A., Coimbra, A.M., A Bacia Bauru (Cretáceo Superior, Brasil) (1996) Anais da Academia Brasileira de Ciências, 68 (2), pp. 195-205Fernandes, L.A., Coimbra, A.M., Revisão estratigráfica da parte oriental da Bacia Bauru (Neocretáceo) (2000) Revista Brasileira de Geociências, 30 (4), pp. 723-734. , http://www.sbgeo.org.brFernandes, L.A., Coimbra, A.M., Brandt Neto, M., Desenzi, A.L.G., Argilominerais do Grupo Caiuá (1994) Revista Brasileira de Geociências, 24 (2), pp. 90-96. , http://www.sbgeo.org.brFernandes, L.A., Giannini, P.C.E., Góes, A.M., Araçatuba Formation: palustrine deposits from initial sedimentation phase of the Bauru Basin (2003) Anais da Academia Brasileira de Ciências, 75 (2), pp. 173-187Hunter, R.E., Basic types of stratification in small eolian dunes (1977) Sedimentology, 24, pp. 361-387Kocurek, G., First-order and super bounding surfaces in eolian sequences - bounding surfaces revisited (1988) Sedimentary Geology, 56, pp. 193-206Kocurek, G., Dott, R.H., Distinction and uses of stratification types in the interpretation of eolian sand (1981) Journal of Sedimentary Petrology, 51, pp. 579-595Kocurek, G., Nielson, J., Conditions favorable for the formation of warm-climate aeolian sand sheets (1986) Sedimentology, 33, pp. 795-816Lancaster, N., Origins and sedimentary features of supersurfaces in the northwestern Gran Desierto Sand Sea (1993) Aeolian Sediments: Ancient and Modern, 16, pp. 71-83. , Pye K., and Lancaster N. (Eds), IAS Special PublicationLangford, R.P., Chan, Downward changes within an ancient dune sea, Permian Cedar Mesa Sandstone, southeast Utah (1993) Aeolian Sediments: Ancient and Modern, 16, pp. 109-126. , Pye K., and Lancaster N. (Eds), IAS Special PublicationLawrence, D.A., Williams, B.P.J., Evolution of the drainage systems in response to Acadian deformation: the Devonian Battery Point Formation, Eastern Canada (1987) Recent developments in fluvial sedimentology, 39, pp. 287-300. , Ethridge G., Flores R.M., and Harvey D. (Eds), SEPM Special PublicationMcKee, E.D., Experiments on ripples lamination (1965) Sedimentary structures and their hydrodynamic interpretation, 53, pp. 66-83. , Middleton G.V. 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Sedimentary facies, basin analysis and petroleum geology, , Spriger-Verlag, New York 582 ppNielson, J., Kocurek, G., Climbing zibars of the Algodones (1986) Sedimentary Geology, 48, pp. 1-15Renne, P.R., Ernesto, M., Pacca, I.G., Coe, R.S., Glen, J.M., Prévot, M., Perrin, M., The age of the Paraná flood volcanism, rifting of Gondwanaland, and the Jurassic-Cretaceous boundary (1992) Science, 258, pp. 975-979Retallack, G.J., (2001) Soils of the Past: an Introduction to Paleopedology, , Blackwell Science, Oxford 404 p

Paleoprecipitation Estimates And Genesis Of Calcic And Argillic Features In Paleosols Of The Marília Formation (neocretaceous Of The Bauru Basin) [estimativas De Paleoprecipitação E Gênese De Feições Cálcicas E Argílicas Em Paleossolos Da Formação Marília (neocretáceo Da Bacia Bauru)]

This paper aims to investigate the genesis of calcic and argillic features which occur in paleosols of the Marília Formation. In a general sense, these features are concentrated in two paleosol horizons, the calcic features in Bk Aridisol horizons and argillic features in Bt Aridisol and Alfisol horizons. In this paper 19 paleosol profiles were studied and detail macro and micromorphological, geochemical, and SEM analyses were performed on 3 Bk and 11 Bt horizons. The paleoprecipitation estimates were inferred following two climofunctions, depth-to-carbonate from Bk and chemical composition from Bt horizons. By comparing the calcic and argillic features of these horizons with modern soil horizons this study demonstrates that these features were pedogenically formed and that paleoprecipitation was an important forcing factor in the genesis and principally in the differentiation of these features.2913347Alonso-Zarza, A.M., Palaeoenvironmental significance of palustrine carbonates and calcretes in the geological record (2003) Earth-Science Reviews, 60, pp. 261-298Arkley, R.J., Calculation of carbonate and water movement in soil from climatic data (1963) Soil Science, 96, pp. 239-248Basilici, G., Dal'Bo, P.F.F., Ladeira, F.S.B., Climateinduced sediment-palaeosol cycles in a Late Cretaceous dry aeolian sand sheet: Marília Formation (North-West Bauru Basin, Brazil) (2009) Sedimentology, 56, pp. 1876-1904Batezelli, A., (1998) Redefinição Litoestratigráfica Da Unidade Araçatuba E Da Sua Extensão Regional Na Bacia Bauru No Estado De São Paulo, p. 110. , Rio Claro, Dissertação (Mestrado) - Instituto de Geocie^ncias e Ciências Exatas, Universidade Estadual PaulistaBatezelli, A., (2003) Análise Da Sedimentação Cretácea No Triângulo Mineiro E Sua Correlação Com Áreas Adjacentes, p. 183. , Rio Claro, Tese (Doutorado) - Instituto de Geociências e Ciências Exatas, Universidade Estadual PaulistaBirkeland, P.W., (1999) Soils and Geomorphology, , 3rd edition. 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