A concretion is a hard and 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.

2023年4月7日 · 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. You shouldn’t confuse a concretion with a nodule.

The meaning of CONCRETION is something concreted. How to use concretion in a sentence.

2020年4月3日 · 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 …

2018年5月3日 · 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...

2020年1月16日 · 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.

Concretions can have regular shapes like blocks, boxes, pipes, flat discs, canon balls, or even resemble parts of a human body such as a foot or rib. It is sometimes hard to believe that they formed by natural processes. Ironstone concretions are common around Sydney, with its outcrops of iron-rich shale and sandstone.

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. You might find these chapters and articles relevant to this topic.

In this article we explain how and where concretions form and discuss the evidence, ranging from outcrop data to sophisticated laboratory analyses, which can be used to determine their origins. The roles of microbes, decaying carcasses, compaction and groundwaters are highlighted.

2018年6月8日 · 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.