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  • The word 'concretion' is derived from the Latin con meaning 'together' and crescere meaning 'to grow' This concretionary cement often makes the concretion harder and more resistant to weathering than the host. — “Concretion - Wikipedia, the free encyclopedia”,
  • Siltstone, Conglomerate, Chalk, Limestone, concretionary beds chalk, chalky limestone, coquinas, phosphorite and concretionary beds including calcite, siderite and pyrite. — “Colorado Group - Wikipedia, the free encyclopedia”,
  • S-5-7, from bottom to top: rock bottom of cave, 5" angular fragments, 8" smooth concretionary limestone fragments mixed with brown dust, 6" of ash mixed with angular fragments, 10" of layered gray (volcanic? cave, 17" of broken concretionary limestone fragments, 16" of brown. — “Shelter Cave - Wikipedia, the free encyclopedia”,


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