concretions

the geologist studied the unusual concretions within the shale formation.

fossilized concretions often resemble small, stony eggs.

we found several spherical concretions while digging in the riverbed.

the presence of concretions can indicate a specific depositional environment.

these concretions are composed primarily of calcium carbonate.

the size and shape of concretions vary greatly.

ancient concretions can provide insights into past geological conditions.

the concretions formed through diagenesis over millions of years.

we collected samples of the concretions for laboratory analysis.

the concretions displayed a distinctive concentric layering pattern.

the researchers mapped the distribution of concretions across the field.