| Further to the west the tidal shoreline contains sandy accretions, silt and large detrital mats at the outfall of marshes. |
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| Closer to the contact microcline is replaced by sanidine, and perthitic exsolution in detrital alkali feldspar begins to disappear. |
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| The sediments are finely laminated mudstones, formed in an outer shelf detrital belt, in quiet water environments. |
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| Because they formed within the peat, coal balls generally contain very little detrital clay minerals and quartz. |
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| Eighteen analyses of detrital zircon and one of monazite were carried out for the late Silurian sandstone. |
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| In this case the surrounding sediment matrix is dominated by detrital quartz and illite along with various other clay minerals. |
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| Refractory clay, also known as fire clay, is a detrital clay composed mainly of kaolinite with a high content of alumina and silica. |
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| Deepwater detrital deposits are controlled by autogenetic cycles and allogenetic cycles. |
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| The presence of detrital cordierite in soil 300 feet up-slope from the outcrop suggests that the deposit may have a minimum strike length of 500 feet. |
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| Recent analyses that have shown that detrital zircons can be transported considerable distances in fluviatile environments, implying laterally extensive drainage systems. |
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| This material was available to epibenthic consumers, although it was more diluted with other detrital matter with increasing down-estuary distance. |
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| These detrital sediments have, however, been investigated archaeologically only to a depth of less than five meters in any part of the Niger Delta. |
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| Emergent macrophytes are a major source of organic matter production in freshwater wetlands, and often represent the bulk of the plant material entering the detrital pool. |
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| Most desert soils are typically lithosols, the important constituents of which are resistate detrital quartz and accessory minerals such as zircon and secondary clay minerals. |
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| Evidence in the form of detrital zircon grains suggest that many of the older sedimentary rocks were eroded from the old continent. |
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| The detrital zircon data provide constraints on the maximum age of deposition and on the source regions of these mostly unfossiliferous units. |
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| Further evidence of the lack of oxygen in the early atmosphere is provided by detrital uraninite and pyrite and by paleosols i.e., fossil soils. |
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| It consists largely of lava flows, volcanic ash deposits, and detrital sediments. |
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| Area 4: This area is generally considered a marine basin environment with phosphatic shales, siltstone and detrital sandstones. |
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| The mud worm is a deposit feeder that uses two horns to pull detrital matter into its 5 cm long tube. |
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| It is a reddish brown sandstone formed by detrital quartz, plagioclase, feldspar and muscovite, with subordinate apatite, zircon and opaque minerals. |
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| Zircon is an important phase for the petrogenetic interpretation as all the separated grains have rounded, detrital cores with thin euhedral overgrowths. |
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| The provenance for the detrital material in the general region was to the east, in the continental arc, where magmatic and deformed lower Mesozoic rocks were exposed. |
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| If the detrital material in a chemical rock fluctuates between 5 and 50 per cent, the chances are very great that this chemical rock has a clastic texture. |
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| The quartz grains are largely unstrained, but minor ribboned quartz, characteristic of highly deformed terrains, is found as a significant detrital phase only in this member. |
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| The cloudberry pips are a tiny part of the detrital build-up during the last remaining occupation. |
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| A note on the use of statistics in reporting detrital clastic compositions. |
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| The maximum age of deposition of the Flagg Cove Formation is 574 ± 7 Ma based on the youngest statistical age population of detrital grains in the quartzose sandstone sample. |
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| In addition, removal of forest vegetation can increase soil erosion, resulting in increased sedimentation and detrital input to streams and lakes. |
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| The mercury in till is interpreted to be of detrital origin. |
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| It owes its characteristics to the physical and chemical composition of the detrital, gravelly, sandy and loamy material ferried by the waters and deposited in the flood plain. |
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| A large amount of continental detrital sediments were deposited during the tertiary area in a soft and friable rock, the molasse, which was widely eroded by rivers. |
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| The lamination is mostly flat but sometimes undulant and distorted around tests and detrital grains. |
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| The youngest statistical detrital zircon population in the sandstone sample from the Calais Formation indicates that its maximum age of deposition is 510 ± 8 Ma, which is Middle Cambrian. |
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| Energy passes through these trophic levels primarily along the grazer and detrital chains and is progressively degraded to heat through metabolic activities. |
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| The youngest statistical detrital zircon population in the sandstone sample from the Ellsworth Formation has an age of 507 ± 6 Ma, which is Middle Cambrian. |
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| Pine pollen may play an important role in the functioning of detrital food webs. |
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| In this context, detrital zircon chronology appears to be a promising tool for provenance analysis of Baltic sedimentary basins. |
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| Inherited and detrital zircons from rocks in the the South Indian Lake area suggest that early Paleoproterozoic basement underlies parts of central Manitoba. |
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| Rodas M, Luque FJ, Mas R, Garzon G Calcretes, palycretes and silcretes in the Paleogene detrital sediments of the Duero and Tajo basins, central Spain. |
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| Of these, the best known are dinoflagellate genera such as Noctiluca and Dinophysis, that obtain organic carbon by ingesting other organisms or detrital material. |
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| Detrital magnetite could have oxidized to hematite and goethite, while detrital ilmenite could transform to leucoxene during early diagenetic stages. |
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| Evidence for the Acadian displacement event is based on the geochemical study of detrital garnets in the Lower Old Red Sandstone on the Northern limb of the Strathmore Basin. |
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| Geochronological analyses of detrital zircon grains in clastic sedimentary rocks offer important information about potential source regions for sedimentary basin fill. |
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| Detrital quartz from an igneous source is usually substantially brighter in luminescence than quartz of an authigenic origin. |
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| Detrital dumortierite infrequently has been found in the heavy mineral fraction of sediments. |
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| Detrital monazite will not survive sedimentary recycling as well as zircon, so it provides a better estimate of the age of the most recent terrane erosion. |
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