What is a rounded mass or nodule produced by an aggregation of the material around a center; as, the calcareous concretions common in beds of clay called?
concretion — (Geol.) A rounded mass or nodule produced by an aggregation of the material around a center; as, the calcareous concretions common in beds of clay. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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- Published: 2026-07-17T00:00:00-07:00 · Modified: 2026-07-17T00:00:00-07:00