Examples of concretion

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The geologists also found the smaller dark-red concretions in the upper part of the image to be interesting.
In order to define the labelled transition semantics, we need some new syntactic forms: abstractions, concretions, and agents.
Then, the implemented component can be removed from the context and added to the implemented part, thus performing a concretion operation.
Abundant concretions at several levels contain well-preserved ammonoids, bivalves and occasional fish.
The member consists of coals, claystones and siltstones rich in siderite concretions, and three to four levels of sandstone, each 2-10 m thick.
Vivianite concretions are found in the basal part of the outcrop.
Figure 7 extends the structural congruence to concretions in the standard way.
We identify concretions up to -renaming of bound variables and bound names.
When these concretions have reached a suitable size, they are carved out of the shell and sold.
The sandy channels are indicative of a fluvial influence; the association with redox features like iron nodules and concretions attest to periodical subaerial exposure.
Ammonoids are mainly preserved in concretions in the lower part of the succession and as filled body chambers in sandstone beds higher in the succession.
The concretions are also found in the bases of local sandstone channels, associated with plant debris and mudstone clasts.
The presence of the concretions in the smallscale channel structures is consistent with their early formation.
The problem is that the current definition of labelled reduction may produce a concretion instead of a process.
This concentrated iron is later oxidized again, forming a dark-red concretion.
Calcareous concretions are also a minor lithology in some localities.
A few iron concretions and nodules have been recognized within the finely laminated strata, always 1.2 m below the base of sandy deposit.
Even at this distance, the small size of the dark-red concretions was at the limits of the perception capabilities of the geologists themselves.
The concretions probably formed only a few centimetres below the sediment-water interface from where they were readily eroded and redeposited.

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