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  1. Concretion - Wikipedia

    • A concretion is a hard, compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. Concretions are often ovoid or spherical in shape, although irregular shapes also occur. The word 'concretion' is derived from the Latin concretio "(act of) compacting, condensing, congealing, uniting"… See more

    Origins

    Detailed studies have demonstrated that concretions form after sediments are buried but before the sediment is … See more

    Appearance

    Concretions vary in shape, hardness and size, ranging from objects that require a magnifying lens to be clearly visible to huge bodies three meters in diameter and weighing several thousand pounds. The giant, red c… See more

    Composition

    Concretions are commonly composed of a mineral present as a minor component of the host rock. For example, concretions in sandstones or shales are commonly formed of a carbonate mineral such as calcite; those in … See more

    Occurrence

    Concretions are found in a variety of rocks, but are particularly common in shales, siltstones, and sandstones. They often outwardly resemble fossils or rocks that look as if they do not belong to the stratum in which th… See more

    Types of concretion

    Concretions vary considerably in their compositions, shapes, sizes and modes of origin.
    Septarian concretions (or septarian nodules) are carbonate-rich concretions containing … See more

    See also

    Bowling Ball Beach – Beach in Mendocino County, California, US
    Caliche, also known as calcrete – Calcium carbonate based concretion of sediment in arid and semi-arid soils… See more

    External links
     
    Kizdar net | Kizdar net | Кыздар Нет
  1. Concretions - Paleontological Research Institution

    Apr 3, 2020 · Concretions are commonly misunderstood geologic structures. Often mistaken for fossil eggs, turtle shells, or bones, they are actually not …

     
  2. Concretions: What Are These Bizarre Rock Formations? (And …

  3. What Is A Concretion? - WorldAtlas

    Jan 16, 2020 · Often mistaken for bones, turtle shells, or fossil eggs, concretions are geological features found in sedimentary rock and soil. A concretion is a hard mass that forms when rock minerals precipitate in cracks or cavities, or …

  4. Scientists Have Cracked The Mystery Of How Fossil …

    May 3, 2018 · Concretions, despite being common in sedimentary rocks, are still a sort of geological mystery. Do dead animals or plants play a role in the formation of concretions, or do concretions simply...

  5. Concretions Picture Gallery - ThoughtCo

    Aug 24, 2017 · Concretions are hard bodies that form in sediments before they become sedimentary rocks. Slow chemical changes, perhaps related to microbial activity, cause minerals to come out of the groundwater and seal the sediment …

  6. CONCRETIONS AND NODULES IN NORTH DAKOTA

    Sep 16, 2015 · A concretion is a clearly bound body of rock within generally softer enclosing sediments of the same composition. The term comes from the Middle English concret, itself derived from the Latin concrescere, meaning to grow …

  7. Concretion - an overview | ScienceDirect Topics

  8. Concretions, Thunder Eggs and Geodes - Australian …

    Concretions are compact, often rounded, accumulations of mineral matter that form inside sedimentary rocks such as shale and sandstone or in soil.

  9. Concretions in mine roofs, Coal Mining Geology, …

    Jan 5, 2023 · Definition and formation: Concretions are isolated, often oval-shaped rock masses. Concretions are commonly composed of limestone (calcium carbonate), but silica-rich concretions also occur. Limestone concretions are …

  10. Concretions: Inexplicable spherical rocks - Quarry

  11. Concretion - an overview | ScienceDirect Topics

  12. Septarian Concretion: What Is It and Characteristics – Geology In

  13. Concretions - DesertUSA

  14. Scientists Crack Mystery Of How Fossil Concretions Form

  15. Cracking open the formation of fossil concretions - Geology Page

  16. Concretions - Natural Atlas

  17. Carbonate concretions-explained - University of South Wales

  18. What Does Concretion Mean In Geology | Science-Atlas.com

  19. New Silurian aculiferan fossils reveal complex early history of ...

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