Kalkkikerrostuma
Kalkkikerrostuma is a geological term in Finnish referring to calcite-rich concretionary structures or laminated calcareous layers that form within sedimentary rocks or soils. The term describes both nodular calcite masses and laminated calcareous beds that stand out from the surrounding material.
Formation is a diagenetic process in which calcium carbonate precipitates from pore waters in carbonate-bearing sediments.
Morphology commonly includes nodules embedded in limestone, shale, marl, or chalk, as well as discrete laminated
Occurrence and significance: Kalkkikerrostumat are widespread in carbonate-bearing sedimentary successions worldwide and record diagenetic histories and
Etymology and usage: The name combines kalkk- (calcium carbonate/limestone) with kerrostuma (layering or concretion).