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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. [1] Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
Apr 3, 2020 · Concretions are commonly misunderstood geologic structures. Often mistaken for fossil eggs, turtle shells, or bones, they are actually not fossils at all but a common geologic phenomenon in almost all types of sedimentary rock, including sandstones, shales, siltstones, and limestones. Concretions form inside sediments before they harden into ...
- Paleontological Research Institution
Apr 7, 2023 · Concretions are formed through the precipitation of minerals in sediment before it hardens. Essentially, they became mineralized before the rest of the surrounding rock. Concretions form early on in the sedimentary stone cycle if they’re present.
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 through the build-up of sediment.
- John Misachi
Concretions are masses of rock that form when minerals grow around organic debris, commonly found in black shales and occasionally in gray shales. They can occur as individual concretions or clusters and may be loosely bonded to the surrounding shale. AI generated definition based on: International Journal of Coal Geology, 2020. About this page.
1. the act or process of coming or growing together; coalescence. 2. a solid or solidified mass. 3. something made real, tangible, or specific. 4. any of various rounded or irregular mineral masses formed by chemical precipitation around a nucleus, such as a bone or shell, that is different in composition from the sedimentary rock that surrounds it
Jun 8, 2018 · concretion, mass or nodule of mineral matter, usually oval or nearly spherical in shape, and occurring in sedimentary rock [1]. It is formed by the accumulation of mineral matter in the pore spaces of the sediment, usually around a fossil or fossil fragment acting as a nucleus.
