concretions siderite

  • North Dakota Geologic Survey

    North Dakota Geologic Survey

    North Dakota, especially in the wondrously sculpted badland areas of the west, has a fantastic variety of concretions and nodules. Some are the size and shape of petrified logs, while others, perched atop pedestals of softer sediments that they shield from erosion, have lens or disk shapes.

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  • CONCRETIONS AND NODULES IN NORTH DAKOTA

    CONCRETIONS AND NODULES IN NORTH DAKOTA

    North Dakota, especially in the wondrously sculpted badland areas of the west, has a fantastic variety of concretions and nodules. Some are the size and shape of petrified logs, while others, perched atop pedestals of softer sediments that they shield from erosion, have lens or disk shapes.

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  • Rinded ironoxide concretions: Hallmarks of altered

    Rinded ironoxide concretions: Hallmarks of altered

    of siderite, a mineral that forms only under reducing conditions, during either early or late diagenesis. Siderite is vulnerable to complete oxidation upon exposure, so the distinctive rinded concretions are valuable clues that aid in deciphering diagenetic histories and for recognizing methanic floodplain paleoenvironments and wet paleoclimate.

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  • Geology 135 Sedimentation Diagenesis

    Geology 135 Sedimentation Diagenesis

    Concretions often form early in diagenesis, shortly after compaction. Evidence for this is seen in the lack of compaction in layers and fossils preserved within the concretion relative to the layers outside of the concretion. Siderite and Pyrite. siderite (Fe2CO3) and pyrite (FeS2)

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  • Concretion Wikipedia

    Concretion Wikipedia

    Aug 24, 2017 · Slow chemical changes, perhaps related to microbial activity, cause minerals to come out of the groundwater and seal the sediment together. Most often the cementing mineral is calcite, but the brown, ironbearing carbonate mineral siderite is also common. Some concretions have a central particle, such as a fossil, that triggered the cementation.

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  • Siderite concretions: indiors of early diagenesis in

    Siderite concretions: indiors of early diagenesis in

    The Gammon member of the Pierre shale of the northern Great Plains, USA, contains abundant siderite concretions. The relative depth and time of siderite precipitation can be inferred from the structure, mineralogy and isotopic composition of these concretions. Concretions that formed at shallow depths, early in the history of the sediment, contain a high percentage (7585%) of carbonate

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  • Geologic units in Nebraska (state in United States)

    Geologic units in Nebraska (state in United States)

    Middle part is lightgray, yellow, red brown and darkgray, sandy carbonaceous shale commonly contains a zone of concretions near top. Lower part is sandstone similar to that in upper except there are zones of siderite concretions and, locally a basal zone of chert pebbles. Approx. max thickness 600 ft.

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  • Septarian Crystal Meanings Spirit Of ISIS Crystals

    Septarian Crystal Meanings Spirit Of ISIS Crystals

    Septarian concretions or Septarian nodules, are concretions containing angular cavities or cracks, which are called ''septaria''. Septarian usually contain crystals precipitated from circulating solutions, usually of Calcite, Siderite or Pyrite. Some Septarian may also contain small Calcite stalactites and wellshaped Pyrite crystals.

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  • Rinded ironoxide concretions: Hallmarks of altered

    Rinded ironoxide concretions: Hallmarks of altered

    of siderite, a mineral that forms only under reducing conditions, during either early or late diagenesis. Siderite is vulnerable to complete oxidation upon exposure, so the distinctive rinded concretions are valuable clues that aid in deciphering diagenetic histories and for recognizing methanic floodplain paleoenvironments and wet paleoclimate.

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  • THE OCCURRENCE AND ORIGIN OF SIDERITE CONCRETIONS IN

    THE OCCURRENCE AND ORIGIN OF SIDERITE CONCRETIONS IN

    MAZON CREEK FOSSILS THE OCCURRENCE AND ORIGIN OF SIDERITE CONCRETIONS IN THE FRANCIS CREEK SHALE (PENNSYLVANIAN) OF NORTHEASTERN ILLINOIS Bertram G. Woodland Curator of Petrology Field Museum of Natural History Chicago, Illinois Richard C. Stenstrom Department of Geology Beloit College Beloit, Wisconsin ABSTRACT Siderite concretions are well known from

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  • A geobiological investigation of the Mazon Creek

    A geobiological investigation of the Mazon Creek

    Siderite concretions from the midPennsylvanian Francis Creek Shale of the Mazon Creek area, in northeastern Illinois, contain exceptionally preserved softtissue fossils. Scanning electron microscopy, energy dispersive spectroscopy, time of flightsecondary

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  • Siderite: The mineral Siderite information and pictures

    Siderite: The mineral Siderite information and pictures

    Siderite is a common mineral and is found worldwide in many different environments. Only the most noteworthy will be mentioned here. Classic Siderite occurrences in Europe include Neudorf in the Harz Mountains, Germany and Panasqueira, Portugal. Excellent gemmy greenish crystals come from Isere, (especially at Allevard), France.

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  • Siderite: Mineral information, data and localities.

    Siderite: Mineral information, data and localities.

    Calcite Group. MagnesiteSiderite Series, RhodochrositeSiderite Series, SideriteSmithsonite Series. Crystals typically found as brown to tan rhombohedrons in clusters, faces often curved or composites more often found as medium to dark brown massive finegrained material or as massive crystalline material with exposed curved cleavage surfaces.

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  • Origin of Siderite Concretions In Microenvironments of

    Origin of Siderite Concretions In Microenvironments of

    They host siderite concretions with δ 13 C values ranging from −3.5 to 12.1‰ which show that sulfate reduction and methanogenesis contributed to the production of bicarbonate. Fossils are found within each of the concretions, suggesting that the decay of these organic remains provided a alyst for concretionary growth.

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  • THE OCCURRENCE AND ORIGIN OF SIDERITE CONCRETIONS IN

    THE OCCURRENCE AND ORIGIN OF SIDERITE CONCRETIONS IN

    MAZON CREEK FOSSILS THE OCCURRENCE AND ORIGIN OF SIDERITE CONCRETIONS IN THE FRANCIS CREEK SHALE (PENNSYLVANIAN) OF NORTHEASTERN ILLINOIS Bertram G. Woodland Curator of Petrology Field Museum of Natural History Chicago, Illinois Richard C. Stenstrom Department of Geology Beloit College Beloit, Wisconsin ABSTRACT Siderite concretions are well known from

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  • Siderite concretion Etsy

    Siderite concretion Etsy

    You searched for: siderite concretion! Etsy is the home to thousands of handmade, vintage, and oneofakind products and gifts related to your search. No matter what you''re looking for or where you are in the world, our global marketplace of sellers can help you

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  • Siderite concretions indiors of early diagenesis in

    Siderite concretions indiors of early diagenesis in

    The Upper Cretaceous Gammon Shale in the northern Great Plains contains abundant siderite concretions that formed during the early compactional history of the finegrained, marine sediments. The relative depth of siderite precipitation can be estimated on the basis of textural, mineralogical, and isotopic evidence.

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  • SIDERITE CONCRETIONS IN THE COPAN CRINOID LAGERSTÄTTE

    SIDERITE CONCRETIONS IN THE COPAN CRINOID LAGERSTÄTTE

    SIDERITE CONCRETIONS IN THE COPAN CRINOID LAGERSTÄTTE Palaios

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  • Siderite concretion horizon above the No. 22 Coal Seam in

    Siderite concretion horizon above the No. 22 Coal Seam in

    Siderite concretion horizons are known both from the paralic and terrestrial sediments of the Upper Silesian Basin. Significant horizon above the No. 22 Coal Seam in the Upper Suchá Member of Karviná Fm. (Westphalian, Pennsylvanian) was investigated by

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  • AAPG Datapages/Archives: Siderite Concretions: Indiors

    AAPG Datapages/Archives: Siderite Concretions: Indiors

    The Upper Cretaceous Gammon Shale in the northern Great Plains contains abundant siderite concretions that formed during the early compactional history of the finegrained, marine sediments. The relative depth of siderite precipitation can be estimated on the basis of textural, mineralogical, and isotopic evidence.

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  • siderite Example sentences

    siderite Example sentences

    Examples of how to use "siderite" in a sentence from the Cambridge Dictionary Labs

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  • Round the Rocks: Curious New Zealand Concretions

    Round the Rocks: Curious New Zealand Concretions

    ''Septarian'' concretions contain an internal network of shrinkage cracks, which widen towards the interior and may be filled with crystals, commonly calcite, sometimes other minerals such as siderite barite or pyrite. Concretions tend to stand out in rock outcrops due to their eyeching shape(s) and erosion resistant nature due to

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  • Siderite: The mineral Siderite information and pictures

    Siderite: The mineral Siderite information and pictures

    Siderite is a common mineral and is found worldwide in many different environments. Only the most noteworthy will be mentioned here. Classic Siderite occurrences in Europe include Neudorf in the Harz Mountains, Germany and Panasqueira, Portugal. Excellent gemmy greenish crystals come from Isere, (especially at Allevard), France.

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  • Morphologic Clues to the Origins of Iron Oxide–Cemented

    Morphologic Clues to the Origins of Iron Oxide–Cemented

    Workers in the late nineteenth through midtwentieth centuries, many of whom found evidence for siderite precusors, concluded that many spherical, rinded, iron oxidecemented concretions were formed by centripetal precipitation of iron oxide inward from the perimeter of the concretion in contrast, the walls of pipelike concretions of iron

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  • Anatomically preserved plants in siderite concretions in

    Anatomically preserved plants in siderite concretions in

    Reports of siderite concretions with anatomically preserved plants from coalseam splits are rare from the Carboniferous worldwide. Zaritski (1970, p.28) reported an example from the Donets Basin without supporting data, and the only other report is from the split in the Foord Seam for which Zodrow et al. (1996)gave some geochemical results, based on two unoriented concretions.

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  • What Is a Septarian Concretion?

    What Is a Septarian Concretion?

    A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Septarian concretions are concretions containing angular cavities or cracks, called "septaria". The septaria are the calcite

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  • Siderite concretions indiors of early diagenesis in

    Siderite concretions indiors of early diagenesis in

    The Upper Cretaceous Gammon Shale in the northern Great Plains contains abundant siderite concretions that formed during the early compactional history of the finegrained, marine sediments. The relative depth of siderite precipitation can be estimated on the basis of textural, mineralogical, and isotopic evidence.

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  • Feoxide concretions formed by interacting carbonate and

    Feoxide concretions formed by interacting carbonate and

    The siderite concretion undergoes oxidative dissolution, which is possibly microbially mediated and which provides an internal source of Fe that forms an Feoxide crust on the outside the concretion. However, a problem with this model is that no siderite concretions have been identified,

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  • Microscale sideritic concretions in Holocene sediments of

    Microscale sideritic concretions in Holocene sediments of

    Microscale sideritic concretions in Guadiana sediments 17 components of the heavydensity fraction are tourmalines, amphiboles, pyroxenes, garnets, staurolite, andalusite, carbonates and Feoxides. The sideritebearing layer in the CM5 profile does not differ from

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  • Rinded iron‐oxide concretions: hallmarks of altered

    Rinded iron‐oxide concretions: hallmarks of altered

    In all three deposits, rinded concretions formed when pre‐existing, siderite‐cemented concretions were oxidized within a sand matrix. Unlike fluvial examples, siderite in the Navajo Sandstone was autochthonous and of late diagenetic origin, having precipitated from carbon dioxide and methane‐enriched waters moving through folded and

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  • Cleaning Siderite Concretions Fossil Preparation The

    Cleaning Siderite Concretions Fossil Preparation The

    Jan 19, 2013 · I have some siderite concretions that had been sitting open in the elements when found. They have some fine, lightcolored material lodged in gaps in the fossil and on the broken nodule surface.

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  • North Dakota Geologic Survey

    North Dakota Geologic Survey

    North Dakota, especially in the wondrously sculpted badland areas of the west, has a fantastic variety of concretions and nodules. Some are the size and shape of petrified logs, while others, perched atop pedestals of softer sediments that they shield from erosion, have lens or disk shapes.

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  • THE GEOLOGIC CONTEXT OF WONDERSTONE: A COMPLEX,

    THE GEOLOGIC CONTEXT OF WONDERSTONE: A COMPLEX,

    ABSTRACT: Although siderite is a widespread early diagenetic mineral in fluvial systems, it is unstable in oxidizing environments and destroyed in permeable rocks that experience uplift and exhumation. The products of siderite oxidation, however, (mm to cmscale rhombs, concretions, and complex bands of ironoxide cement) are widespread

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  • SIDERITE (Iron Carbonate)

    SIDERITE (Iron Carbonate)

    Other typical habits include the scalahedron, crusts, sphericules, concretions and complied botyroidal masses. Siderite forms mostly in sedimentary and hydrothermal environments, although it is also found in some igneous pegmatites. Siderite is a common mineral although excellent, attractive crystal specimens are sometimes hard to find.

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  • The Mazon Creek Lagerstätte: a diverse late Paleozoic

    The Mazon Creek Lagerstätte: a diverse late Paleozoic

    One of the best records of late Paleozoic ecosystems, the Mazon Creek Lagerstätte is world famous for its striking flora and fauna preserved within siderite concretions. Distinct from other late Carboniferous concretionary Lagerstätten because of the remarkable fidelity of soft tissues and pigments that are frequently preserved, the Mazon Creek has seen a revival in investigations during the

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  • Siderite: Mineral information, data and localities.

    Siderite: Mineral information, data and localities.

    Calcite Group. MagnesiteSiderite Series, RhodochrositeSiderite Series, SideriteSmithsonite Series. Crystals typically found as brown to tan rhombohedrons in clusters, faces often curved or composites more often found as medium to dark brown massive finegrained material or as massive crystalline material with exposed curved cleavage surfaces.

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  • Siderite concretion Etsy

    Siderite concretion Etsy

    You searched for: siderite concretion! Etsy is the home to thousands of handmade, vintage, and oneofakind products and gifts related to your search. No matter what you''re looking for or where you are in the world, our global marketplace of sellers can help you

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  • Septarian concretions SpringerLink

    Septarian concretions SpringerLink

    Septarian structures occur in concretions or concretionary sheets, which may be chemically and mineralogically the same as nonseptarian concretions in the same mudrock. The host concretions are most commonly calcite, dolomite or siderite dominated, although rare occurrences have been interpreted from silica concretions.

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  • Feoxide concretions formed by interacting carbonate and

    Feoxide concretions formed by interacting carbonate and

    The siderite concretion undergoes oxidative dissolution, which is possibly microbially mediated and which provides an internal source of Fe that forms an Feoxide crust on the outside the concretion. However, a problem with this model is that no siderite concretions have been identified,

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  • Rinded ironoxide concretions: Hallmarks of altered

    Rinded ironoxide concretions: Hallmarks of altered

    of siderite, a mineral that forms only under reducing conditions, during either early or late diagenesis. Siderite is vulnerable to complete oxidation upon exposure, so the distinctive rinded concretions are valuable clues that aid in deciphering diagenetic histories and for recognizing methanic floodplain paleoenvironments and wet paleoclimate.

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  • Concretions DesertUSA

    Concretions DesertUSA

    Concretions Composed of a carbonate mineral such as calcite. A concretion is a compact mass of mineral matter, usually spherical or diskshaped, embedded in a host rock of a different composition.

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  • Rinded iron‐oxide concretions: hallmarks of altered

    Rinded iron‐oxide concretions: hallmarks of altered

    In all three deposits, rinded concretions formed when pre‐existing, siderite‐cemented concretions were oxidized within a sand matrix. Unlike fluvial examples, siderite in the Navajo Sandstone was autochthonous and of late diagenetic origin, having precipitated from carbon dioxide and methane‐enriched waters moving through folded and

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  • AAPG Datapages/Archives: Siderite Concretions: Indiors

    AAPG Datapages/Archives: Siderite Concretions: Indiors

    The Upper Cretaceous Gammon Shale in the northern Great Plains contains abundant siderite concretions that formed during the early compactional history of the finegrained, marine sediments. The relative depth of siderite precipitation can be estimated on the basis of textural, mineralogical, and isotopic evidence.

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  • Siderite: The mineral Siderite information and pictures

    Siderite: The mineral Siderite information and pictures

    Siderite is a common mineral and is found worldwide in many different environments. Only the most noteworthy will be mentioned here. Classic Siderite occurrences in Europe include Neudorf in the Harz Mountains, Germany and Panasqueira, Portugal. Excellent gemmy greenish crystals come from Isere, (especially at Allevard), France.

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  • concretion Example sentences

    concretion Example sentences

    Examples of how to use "concretion" in a sentence from the Cambridge Dictionary Labs

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  • Geology 135 Sedimentation Diagenesis

    Geology 135 Sedimentation Diagenesis

    Concretions often form early in diagenesis, shortly after compaction. Evidence for this is seen in the lack of compaction in layers and fossils preserved within the concretion relative to the layers outside of the concretion. Siderite and Pyrite. siderite (Fe2CO3) and pyrite (FeS2)

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  • Fossil egg or turtle shell, Kentucky Geological Survey

    Fossil egg or turtle shell, Kentucky Geological Survey

    Siderite is another type of mineral that forms concretions. It is common throughout Kentucky. Generally siderite forms red, orange, or brown concretions, from inches to a foot in length. Some concretions are oval to circular. Others have irregular shapes that may look like horns, teeth, or claws.

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  • WELLORDERED KAOLINITE IN SIDERITE CONCRETIONS

    WELLORDERED KAOLINITE IN SIDERITE CONCRETIONS

    WELLORDERED KAOLINITE IN SIDERITE CONCRETIONS FROM THE BRAZIL FORMATION, WESTERN INDIANA Key WordsConcretion, Crystallinity, Kaolinite, Ordering, Siderite. Soft, white kaolinite fills many shrinkage cracks in siderite concretions in shale overlying the Upper Block Coal Member of the Brazil Formation (Pennsylva

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  • Patterns in Palaeontology: Exceptional Preservation of

    Patterns in Palaeontology: Exceptional Preservation of

    Article" Patterns in Palaeontology: Exceptional Preservation of Fossils in Concretions" by Victoria E. McCoy published on PALAEONTOLOGY[online] with in the Patterns in Palaeontology egory. by Victoria McCoy*1 Introduction: Have you ever seen a geode — a boringlooking ballshaped rock that, when split open, reveals a remarkable crystalline

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  • concretion Example sentences

    concretion Example sentences

    Examples of how to use "concretion" in a sentence from the Cambridge Dictionary Labs

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