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‣ Proveniência de rochas metassedimentares do Greenstone Belt do Rio Itapicuru, Bahia; Provenance of metassedimentary rocks from Rio Itapicuru Greenstone Belt, Bahia

Maria Fernanda Pereira Grisolia
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 26/03/2010 Português
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A área em estudo localiza-se entre o embasamento mesoarqueano do Núcleo Serrinha e o Greenstone Belt do Rio Itapicuru (BA). O Núcleo Serrinha é constituído pelo Complexo Santa Luz, caracterizado por rochas metamórficas gnáissico-migmatíticas (Mascarenhas 1979), cobertas pelas vulcânicas do Grupo Capim (Winge 1984, apud. Cruz Filho et al. 2003) e pelas seqüências vulcano-sedimentares do Greenstone Belt do Rio Itapicuru (Brito Neves et al. 1980), intrudidas por granitóides diversos e recobertas por unidades fanerozóicas. Embora vários estudos tenham sido feitos, ou estão em desenvolvimento no GBRI, pouco se conhece sobre as rochas sedimentares do mesmo e quase nada sobre as relações de contato do GBRI e o embasamento. Por este motivo, foi planejado um projeto de cartografia geológica da transição embasamento-greenstone que resultou em um mapa geológico de uma área com cerca de 700 km2 entre as cidades de Nordestina, Queimadas e Santa Luz, a oeste da exposição principal do greenstone belt do Rio Itapicuru. Nesta região foi mapeada uma sequência de rochas sedimentares clásticas metamorfisadas denominada Sequência Metassedimentar Monteiro por Grisolia (2007) e Moreto (2007) em seus trabalhos de conclusão de curso de Geologia. Estudos de proveniência de sedimentos...

‣ Sedimentology and taphonomy of storm-generated shell beds from the Verulam formation (Ordovician), Lakefield and Gamebridge quarries, Southern Ontario, Canada /

McFarland, Sean.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
Português
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The Verulam Formation (Middle Ordovician) at the Lakefield Quarry and Gamebridge Quarry, southern Ontario, is comprised of five main lithofacies. These include shoal deposits consisting of Lithofacies 1, winnowed crinoidal grainstones and, shelf deposits consisting of: Lithofacies 2, wackestones, packstones, grainstones, and rudstones; Lithofacies 3, laminated calcisiltites; Lithofacies 4, nodular wackestones and mudstones; and, Lithofacies 5, laminated mudstones and shales. The distribution of the lithofacies was influenced by variations in storm frequency and intensity during a relative sea level fall. Predominant convex-up attitudes of concavo-convex shells within shell beds suggest syndepositional reworking during storm events. The bimodal orientations of shell axes on the upper surfaces of the shell beds indicates deposition under wave-generated currents. The sedimentary features and shell orientations indicate that the shell beds were deposited during storm events and not by the gradual accumulation of shelly material. Cluster and principal component analysis of relative abundance data of the taxa in the shell beds, interbedded nodular wackestones and mudstones, and laminated mudstones and shales, indicates one biofacies comprised of three main assemblages: a strophomenid (Sowerbyelladominated) assemblage...

‣ The surficial geology, sedimentology and geochemistry of the late glacial sediments and Paleozoic bedrock in the Campbellford area, Ontario, with special reference to the Dummer Complex /

Mihychuk, MaryAnn.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
Português
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The Dummer Complex extends 180 km along the Precambrian - Paleozoic contact from Tamworth to Lake Simcoe. It is composed of coarse, angular Paleozoic clasts in discontinuous, pitted, hummocky deposits. Deposits are usually separated by bare or boulder strewn bedrock, but have been found in the southern drumlinized till sheet. Dummer Complex deposits show rough alignment with ice-flow. Eskers cross-cut many of the deposits. Dummer sediment subfacies are defined on the basis of dominant coarse grain size and lithology, which relate directly to the underlying Paleozoic formation. Three subglacial tills are identified based on the degree of comminution and distance of transport; the immature facies of the Dummer Complex; the mature facies of the drumlinized till sheet and; the submature facies which is transitional. Carbonate geochemistry was used for till-bedrock correlation in various grain sizes. Of the 3 Paleozoic formations underlying the Dummer Complex, the Gull River Fm. is geochemically distinctive from the Bobcaygeon and Verulam Formations using Ca, Mg, Sr, Cu, Mn, Fe and Na. The Bobcaygeon Fm. and Verulam Fm. can be differentiated using Ca and the Sr/Ca ratio. The immature facies from 1.0 phi and finer is dominated by the non-carbonate...

‣ The sedimentology of the lower Silurian whirlpool sandstone in subsurface Lake Erie, Ontario

Johnson, Michael Fergus.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
Português
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The lower Silurian Whirlpool Sandstone is composed of two main units: a fluvial unit and an estuarine to transitional marine unit. The lowermost unit is made up of sandy braided fluvial deposits, in shallow valleys, that flowed towards the northwest. The fluvial channels are largely filled by cross-bedded, well sorted, quartzose sands, with little ripple crosslaminated or overbank shales. Erosionally overlying this lower unit are brackish water to marine deposits. In the east, this unit consists of estuarine channels and tidal flat deposits. The channels consist of fluvial sands at the base, changing upwards into brackish and tidally influenced channelized sandstones and shales. The estuarine channels flowed to the southwest. Westwards, the unit contains backbarrier facies with extensive washover deposits. Separating the backbarrier facies from shoreface sandstone facies to the west, are barrier island sands represented by barrier-foreshore facies. The barrier islands are dissected by tidal inlets characterized by fining upward abandonment sequences. Inlet deposits are also present west of the barrier island, abandoned by transgression on the shoreface. The sandy marine deposits are replaced to the west by carbonates of the Manitoulin Limestone. During the latest Ordovician...

‣ The sedimentology of the Bloomington fan complex: an element of the Oak Ridges Moraine, Southern Ontario

Paterson, Jens Tore.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
Português
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The Oak Ridges Moraine is a major physiographic feature of south-central Ontario, extending from Rice Lake westward to the Niagara Escarpment. While much previous work has largely postulated a relatively simple the origin of the moraine, recent investigations have concentrated on delineating the discernible glacigenic deposits (or landform architectural elements) which comprise the complex mosaic of the Oak Ridges Moraine. This study investigates the sedimentology of the Bloomington fan complex, one of the oldest elements of the Oak Ridges Moraine. The main sediment body of the Bloomington fan complex was deposited during early stages of the formation of the Oak Ridges Moraine, when the ice subdivided, and formed a confined, interlobate lake basin between the northern and southern lobes. Deposition from several conduits produced a fan complex characterized by multiple, laterally overlapping, fan bodies. It appears that the fans were active sequentially in an eastward direction, until the formation of the Bloomington fan complex was dominated by the largest fan fed by a conduit near the northeastern margin of the deposit. Following deposition of the fan complex, the northern and southern ice margins continued to retreat...

‣ The sedimentology of unconsolidated deltaic and aeolian sediments east of Dunnville, Ontario /

Pastirik, George Paul.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
Português
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Surficial sediments east of Dunnville, Ontario representing a limited deltaic/lacustrine/aeolian system are investigated with the aim of defining and interpreting their geological history by means of exarrrrning their sedimentology and interrelationships. The Folk and oJard grain size statistics of samples fran the area were calculated. These sample parameters were e1en plotted on maps to detennine regional patterns. The strongest pattern observed was one of distinct fining to the east, away fran the sand source. Aeolian deposits were fourrl to be better sorted than the surrcunding sediments. The grain size parameter values were also plotted on bivariate graphs in an attempt to separate the samples according to depositional environment. This exercise met with little success, as rrost of the sediments sampled in the area have similar grain size parameters. This is believed to be because the sediment sources for the different environments (delta, distal delta, aeolian dune) are intimately related, to the point that nnst dunes appear to have been sourcErl fran immediately local sediments. It is FOstulated that in such a srrall sedimentological sub-system, sediments were not involved in active transport for a length of time sufficient for the rraterial to cane to equilibritnn with its transporting medium. Thus...

‣ Physical volcanology, sedimentology, stratigraphy and petrochemistry of the Berry Creek metavolcanics: an Archean calc-alkaline complex, Lake of the Woods, Ontario

Davison, James Gregory.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
Português
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The steeply dipping, isoclinally folded early Precambrian (Archean) Berry Creek Metavolcanic Complex comprises primary to resedimented pyroclastic, epiclastic and autoclastic deposits. Tephra erupted from central volcanic edifices was dumped by mass flow mechanisms into peripheral volcanosedimentary depressions. Sedimentation has been essentially contemporaneous with eruption and transport of tephra. The monolithic to heterolithic tuffaceous horizons are interpreted as subaerial to subaqueous pumice and ash flows, secondary debris flows, lahars, slump deposits and turbidites. Monolithic debris flows, derived from crumble breccia and dcme talus, formed during downslope collapse and subsequent gravity flowage. Heterolithic tuff, lahars and lava flow morphologies suggest at least temporary emergence of the edifice. Local collapse may have accompanied pyroclastic volcanism. The tephra, produced by hydromagmatic to magmatic eruptions, were rapidly transported, by primary and secondary mechanisms, to a shallow littoral to deep water subaqueous fan developed upon the subjacent mafic metavolcanic platform. Deposition resulted from traction, traction carpet, and suspension sedimentation from laminar to turbulent flows. Facies mapping revealed proximal (channel to overbank) to distal facies epiclastics (greywackes...

‣ Lower Cambrian carbonate stratigraphy and sedimentology, Old Wirrealpa Spring, Flinders Ranges, South Australia

Haslett, Peter Gerald
Fonte: Adelaide, Publicador: Adelaide,
Tipo: Tese de Doutorado Formato: 204370 bytes; application/pdf
Publicado em //1976 Português
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Thesis (Ph.D.1977) from the Dept. of Geology and Minerology, University of Adelaide; 2 v. : maps, plates, 6 fold maps in end pocket ; 30 cm.; Title page, contents and abstract only. The complete thesis in print form is available from the University Library.

‣ Sedimentology and sequence stratigraphy of the Early Triassic Rewan Group, Bowen Basin / Paul V. Grech

Grech, Paul Vincent Joseph William
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado Formato: 147526 bytes; application/pdf
Publicado em //2001 Português
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Thesis (Ph.D.)--University of Adelaide, National Centre for Petroleum Geology and Geophysics, 2004; "February 2001"; Bibliography: p. 335-349.; xxix, 394 p. : ill. (some col.), maps (some col.), plates (col.) ; 30 cm.; Title page, contents and abstract only. The complete thesis in print form is available from the University Library.

‣ Sedimentology of the late Precambrian Mundallio Subgroup : a clastic - carbonate ( Dolomite, Magnesite ) sequence in the Mt. Lofty and Flinders Ranges, South Australia

Uppill, Robin K
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado Formato: 950745 bytes; 5355009 bytes; 5720446 bytes; 1437941 bytes; 2175186 bytes; 1767412 bytes; 1573173 bytes; 3484808 bytes; 2945863 bytes; 428823 bytes; application/pdf; application/pdf; application/pdf; application/pdf; application/pdf; application/pdf; appli
Publicado em //1980 Português
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During deposition of the mixed carbonate - clastic sequence of the Mundallio Subgroup, the " Adelaide Geosyncline " was a very shallow, elongate sedimentary basin, flanked to the west and east by older Precambrian basement. In much of the southern and northern Flinders Ranges, clastic deposition predominated in the lower Mundallio Subgroup. In the north, alternating development of shallow mudflats and sandflats ( Nankabunyana Formation ) depended on the interplay between the sediment supply and winnowing processes, while dolomite mudstones were locally deposited in the shallowest areas. In the eastern half of the Willouran Ranges, massive shales were deposited as the environment remained persistently below wave base ( Camel Flat Shale ), but a renewed sand influx led to deposition of the Tilterana Sandstone. In the southern Flinders Ranges, terrigenous clay and silt were deposited on submergent mudflats which shallowed into intermittently exposed dolomite mudflats ( Nathaltee Formation ). Dolomite mudflats were a more persistent feature in areas more distal from the terrigenous source, and sometimes contained isolated, ephemeral lakes which were sites of magnesite deposition ( Yadlamalka Formation ). Dolomite and magnesite mudstone deposition of the Yadlamalka Formation became wide spread in the northern and southern Flinders Ranges in the upper Mundallio Subgroup...

‣ The geology of the Depot Creek area, Flinders Ranges, South Australia.

Sweet, I. P.; Preiss, W. V.
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //1966 Português
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A sequence of Late Precambrian sedimentary rocks, reaching a total thickness of 7,000 ft., was mapped at Depot Creek, on the western scarp of the Flinders Ranges, South Australia. A review of studies on or near the area by previous authors is presented. Ten formations were recognized and mapped. Formations (4) to (10) have been placed in the Adelaide Supergroup, formations (7) to (9) belonging to the Sturt Group, and formation (10) belonging to the Marino Group. From the oldest to the youngest, these are:- (1) Pre-Adlaide Supergroup Redbed Sequence. A shallow water deposit with minor dolomite sedimentation. (2) Dolerite. Intrudes (1), but upper age is uncertain. Extensively altered, possibly by reactions during cooling. (3) Depot Creek Volcanics. Subaerial trachytic lavas, which have undergone extensive post-depositional alteration. The origin of amygdales and tuffaceous rocks is discussed. (4) Emeroo Quartzite. A transgressive shallow marine sand body unconformably overlying the volcanics. (5) Dolomite-Magnesite Sequence. Continuous dolomite sedimentation with minor magnesite conglomerates and classics, probably deposited in a lagoonal environment. Dolomitic Sandstone. Possibly also lagoonal, but with a more constant influx of arkosic sand. (7) Tillitic Sequence. Overlies (6) with possible disconformity...

‣ Geology of the Mt. Chambers Gorge region, South Australia.

Mount, Trevor J.
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //1970 Português
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Mapping and section measuring south of Mt. Chambers Gorge has detailed 2,900 feet of Lower Cambrian carbonates, ranging from the massive carbonates of the Wilkawillina Limestone to the purple shales of the Billy Creek Formation. Carbonates include thinly laminated, oolitic and pelletal limestones and previously unreported mega-breccias. An autochthonous sedimentary pattern, typical of deposition in epeiric seas has been imprinted on the vertical sequence by a marine regression. This tends to be masked by allochthonous sediments, dominantly silts, clay and a coarse quartz sand, possibly eroded from diapers. Brecciolas (slumps) with archaeocyathid limestone megaclasts (to 70ft.) occur locally in the upper beds of the Parara Formation and may help to date diapiric movements. Late phase dole rites intrude diapers and cut related faults; mineralization is also diaper associated and includes copper and lead sulphides.; Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 1970; This item is only available electronically.

‣ Sedimentology and structural geology of the Endicott Mountains allochthon, central Brooks Range, Alaska

Handschy, James William
Fonte: Universidade Rice Publicador: Universidade Rice
Português
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The Endicott Mountains allochthon is an east-west striking stack of north-northwest vergent thrust sheets which were emplaced during late Mesozoic and Cenozoic (Brookian) orogenesis. Thrust sheets in the allochthon are composed of clastic and carbonate rocks which track the progressive evolution of a Late Devonian and Early Carboniferous continental margin. Sedimentary facies in lower Upper Devonian rocks of the Beaucoup Formation delimit a volcanically active depositional basin. Volcaniclastic sediments within the Beaucoup were apparently derived from the south; whereas siliciclastic sediments were derived from the north. By the late Late Devonian, the Beaucoup depositional basin had developed into a south-facing continental margin. Southwestward progradation of the Kanayut-Hunt Fork delta system deposited thick conglomerates, sandstones, and shales on the margin and created a lithofacies pattern in which the Kanayut Conglomerate is thicker in the north and the Hunt Fork Shale is thicker in the south. Transgression of the Lower Mississippian Kayak Shale over the Kanayut Conglomerate occurred as sea level rose during the Early Mississippian. Subsequent transgressive-regressive cycles in carbonates of the Lisburne Group indicate that the margin had evolved into a stable passive margin by the middle Mississippian. The style of Brookian structures in the Endicott Mountains allochthon changes from imbricate thrust sheets and large single-phase folds in the north to a thick...

‣ Sedimentation and stratigraphy of the Devonian rocks of southeastern Indiana

Murray, Haydn H.
Fonte: Indiana Geological Survey Publicador: Indiana Geological Survey
Tipo: Livro Formato: 9198045 bytes; application/pdf
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Indiana Geological Survey Guidebook 8; Devonian rocks in southern Indiana have presented many problems of correlation; their stratigraphy has been studied during recent years by T. A. Dawson and John B. Patton. General conditions of sedimentation of the Devonian rocks are reviewed in this guidebook by Haydn H. Murray. Other aspects of the Devonian rocks and the general area of the conference also are discussed; these reports include geochemistry, economic geology, and the physiography and Pleistocene history. Staff members of the Indiana Geological Survey and the Department of Geology, Indiana University, will talk briefly at each of the scheduled stops; they will review such aspects of the chemical composition, petrology, mineralogy, and stratigraphic nomenclature as are most applicable to the locality and exposure.; Indiana Department of Conservation

‣ Fifteenth Annual Report of the Indiana Department of Geology and Natural History

Thompson, Maurice (Editor)
Fonte: William B. Burford, Contractor for State Printing and Binding. Publicador: William B. Burford, Contractor for State Printing and Binding.
Tipo: Parte de Livro
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‣ Field Trip on Silurian Sedimentary Geology with Special Emphasis on the Reefs, Great Lakes Area

Shaver, Robert H.
Fonte: Indiana University Department of Geology Publicador: Indiana University Department of Geology
Tipo: Trabalho em Andamento
Português
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Sedimentology Field Trip prepared for Indiana University Students enrolled in Geology G420 circa mid 1980s.

‣ Sedimentology and petroleum geochemistry of the Ouldburra Formation, eastern Officer Basin, Australia / by Mohammad Reza Kamali.

Kamali, Mohammed Reza
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado Formato: 154911 bytes; application/pdf
Publicado em //1995 Português
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Thesis (Ph.D.)--University of Adelaide, National Centre for Petroleum Geology and Geophysics, 1996; Copies of author's previously published works inserted.; Bibliography: leaves 153-165.; ix, 165, [153] leaves, [10] leaves of plates : ill. (chiefly col.), maps ; 30 cm.

‣ Structure and sedimentology of the Cape Forbin area, southern Adelaide fold-thrust belt: implications for regional tectonics

Fairclough, M. C.
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //1992 Português
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Recent detailed work has attempted to elucidate the structural and stratigraphic relationships within the Kanmantoo Group of the southern Adelaide fold belt, and to help solve some of the problems outlined above. The present study is partly a continuation of this program of investigation. Detailed structural investigations were carried out within the chosen 3x9 km field area, situated on the north-west coast of Kangaroo Island. The region was chosen specifically to examine a recently discovered shear zone east of Cape Forbin, and its possible implications for local and regional geological relationships within the Kanmantoo Group. Geological mapping at a scale of 1:10 000, appropriate strain analysis techniques, and thin-section microstructural analysis were implemented to determine the geometric, kinematic and tectonic evolution of the area. Additional brief investigations were conducted outside of the original study area in order to clarify various geological relationships. The aims of this study also encompass sedimentological and stratigraphic aspects of the Cape Forbin area. Such studies are, in part, intended to provide some understanding of the (disputed) depositional environments of the Kanmantoo Group. Consequently...

‣ Sedimentology and stratigraphy of the Lower Silurian Grimsby formation, in subsurface, Lake Erie and Southwestern Ontario

Benincasa, Anthony Joseph.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
Português
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Since the first offshore Lake Erie well was drilled in 1941, the Grimsby and Thorold formations of the Cataract Group have been economically important to the oil and gas industry of Ontario. The Cataract Group provides a significant amount of Ontario's gas production primarily from wells located on Lake Erie. The Grimsby - Thorold formations are the result of nearshore estuarine processes influenced by tides on a prograding shelf and are composed of subtidal channel complexes, discrete tidal channels, mud flats and non-marine deposits. Deposition was related to a regressive - transgressive cycle associated with eustatic sea level changes caused by the melting and resurgence of continental glaciation centred in Africa in the Late Ordovician/Early Silurian. Grimsby deposition began during a regression with the deposition of subtidal channel complexes incised into the marine deposits of the Cabot Head Formation. The presence of mud drapes and mud couplets suggest that these deposits were influenced by tides. These deposits dominate the lower half of the Grimsby. Deposition continued with a change from these subtidal channel complexes to laterally migrating, discrete, shallow tidal channels and mud flats. These were in turn overlain by the non-marine deposits of the Thorold Formation. Grimsby - Thorold deposition ended with a major transgression replacing siliciclastic deposition with primarily carbonate deposition. Sediment was sourced from the east and southeast and associated with a continuation of the Taconic Orogeny into the Early Silurian. The fluvial head of the estuary prograded from a shoreline that was located in western New York and western Pennsylvania running NNE-SSW and then turning NW-SE and paralleling the present day Lake Erie shoreline. iii The facies attributed to the Grimsby - Thorold formations can be ascribed to the three zones within the tripartite zonation suggested by Dalrymple et ale (1992) for estuaries...

‣ Sedimentology and micromorphology of drumlin sediments at Chimney Bluffs State Park, New York, United States of America

Dreger, Derek Leslie.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
Português
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The drumlin sediments at Chimney Bluffs, New York appear to represent a block-inmatrix style glacial melange. This melange comprises sand stringers, lenses and intraclasts juxtaposed in an apparently massive diamicton. Thin section examination of these glacigenic deposits has revealed microstructures indicative of autokinetic subglacial defonnation which are consistent with a deformable bed origin for the diamicton. These features include banding and. necking of matrix grains, oriented plasma fabrics and the formation of pressure shadows at the long axis ends of elongate clasts. Preservation of primary stratification within the sand intraclasts appears to suggest that these features were pre-existing up-ice deposits that were frozen, entrained, then deposited as part of a defonning till layer beneath an advancing ice sheet. Multi-directional micro-shearing within the sand blocks is thought to reflect the frozen nature of the sand units in such a high strain environment. It is also contended that dewatering of the sediment pile leading to the eventual immobilisation of the defonning till layer was responsible for opening sub-horizontal fissures within the diamicton. These features were subsequently infilled with mass flow poorly sorted sands and silts which were subjected to ductile defonnation during the waning stages of an actively deforming till layer. Microstructures indicative of the dewatering processes in the sand units include patches of fine-grained particles within a coarser-grained matrix and the presence of concentrated zones of translocated clays. However...