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a. The act or process of concreting into a mass; coalescence.
b. The state of having been concreted: a concretion of seminal ideas in her treatise.
2. A solid hard mass.
3. Geology A rounded mass of mineral matter found in sedimentary rock.
4. Medicine A solid mass, usually composed of inorganic material, formed in a cavity or tissue of the body; a calculus.

con·cre′tion·ar′y (-shə-nĕr′ē) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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It is challenging to quantify the influence of concretionary carbonate cements on fluid flow in reservoirs because it is difficult to determine the distribution of diagenetic heterogeneity based on subsurface data.
Both the Shublik and Brookian source rocks include rocks such as limestone, chert, fine-grained sandstone, siltstone concretionary carbonate, and silicified tuff, which are brittle and often contain natural fractures, according to the USGS.
The Khewra Sandstone consists of purplish-brown, thick-bedded sandstone with coarse clay bands and concretionary layers in the upper part.
And we need new concretionary financing windows and tools to be available to us so we are not penalized for the development we reach and we are not penalized for doing a moral and right thing - these are the values that we subscribed to in Jordan to keep our borders open and to help our Arab brethren running for safety and stability in our country."
Towards the top of the shale is a horizon of spherical to ovoid concretionary nodules that reach a maximum thickness of 3 cm.