| As small concretionary nodules, it occurs disseminated through sandstone at Kommern in the Eifel. |
| At Cresson Quarry, the Kiamichi Formation is 10 m thick and comprises silty marls with concretionary limestone lenses and layers and minor beds of fine sandstone. |
| Those sections expose concretionary mudstones interbedded with thinner quartz sandstones, limestones, and marl. |
| They conclude that carbonate concretionary growth occurs over a depth range from tens to hundreds of metres of burial. |
| The prevalence of crystalline, concretionary and drusy structures in dolomite can thus be simply explained. |
| The mineral is occasionally found as concretionary masses in cavities in basic igneous rocks such as dolerite. |
