It contains large ( up to 15 feet in diameter ) sandy calcareous concretions.
2.
It is a sedimentary unit, principally made up of mudstone and siltstone, with calcareous concretions.
3.
It is a naturally occurring, non-nacreous, calcareous concretion ( pearl ) from a giant clam.
4.
The calcareous concretions, commonly used as the sources of lime, are known as " ghutin ".
5.
Large calcareous concretions commonly occur within this formation.
6.
The calcareous concretions formed around objects from the shallow reef areas which sank into the deep anoxic basins.
7.
The fossil bed is composed of a grey mudstone with abundant septaria-like calcareous concretions, dating to the Late Permian.
8.
However, almost all species of shelled mollusks are capable of producing pearls ( technically " calcareous concretions " ) of lesser shine or less spherical shape.
9.
A conch pearl is a non-nacreous pearl ( formerly referred to by some sources as a'calcareous concretion') which differs from most pearls that are sold as gemstones.
10.
About 20 % of the hadrosaur's bones were enveloped by calcareous concretions but every single bone not found in a concretion bore many closely spaced ovualar conical depressions.
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