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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. Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
Apr 3, 2020 · The size of the concretion may be related to the permeability of the rock in which it occurs: the more permeable the surrounding rock, the larger the concretion. Below we introduce the major types of concretions and similar rocks, as well as share images of concretions that were sent to us by the public and often initially mistaken for various ...
- Paleontological Research Institution
Apr 7, 2023 · What is a Concretion? A concretion is a hard mass found within layers of sedimentary stone. They’re generally round in shape, and each type tends towards one form or another.
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.
In concretions or diagenetic beds, the carbonates characteristically are pore-filling cements the decreasing concentration of which from centre (up to 85 or 90% by volume) to rim (as little as 25%) reflect the decreasing porosity at the time of precipitation (Hesse et al., 2004 ).
1. : something concreted: such as. a. : a hard usually inorganic mass (such as a bezoar or tophus) formed in a living body. b. : a mass of mineral matter found generally in rock of a composition different from its own and produced by deposition from aqueous solution in the rock. 2. : the act or process of concreting: the state of being concreted.
concretion. [ kon-kre´shun] 1. a calculus or hard inorganic mass in a natural cavity or in tissue. 2. abnormal union of adjacent parts. 3. the process of becoming harder or more solid. Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc.
