FREE: Shale Concretion (rock)

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Description

The listing, Shale Concretion (rock) has ended.

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 they were found. Occasionally, concretions contain a fossil, either as its nucleus or as a component that was incorporated during its growth but concretions are not fossils themselves. They appear in nodular patches, concentrated along bedding planes, protruding from weathered cliffsides, randomly distributed over mudhills or perched on soft pedestals.

Similar age to fossils.

Questions & Comments

Shale Concretion (rock) is in the Collectibles | Other Collectibles category