80195645 Calcite concretion, fairy stone, Quebec
80195645 Calcite concretion, fairy stone, Quebec, Canada, They occur in loose Quaternary deposits, having settled in lakes left by receding glaciers and are considered to be calcite after clay pseudomorphs. It is believed these concretions developed in a permeable layer within the deposits through which water slowly filtered and circulated. The water of percolation, high in carbon dioxide, probably dissolved the classic limestone, and the concentration of the resulting solution continued to increase until the limestone was deposited, thus producing the concretions. John Cancalosi All images are copyright protected and remain the property of Ardea Picture Library Ltd. Permission for use is only granted once fee has been agreed and payment made and all digital files must be destroyed unless agreed otherwise in writing. Images must be credited: Photographer Name / ardea.com www.ardea.com
