I think it is rather common for manganese stromatolites to be found in caves, based on how many publications there are on stromatolites being in caves. However, the stromatolites in caves differ from those found in the ocean, as the ones in the ocean rely on photosynthesizing blue-green algae and cynobacteria to grow. Since caves have no light for photosynthesis, manganese-oxidizing microbes make up the stromatolites found there. Some caves have an abundance of manganese deposits which form the components of the stromatolites. It is believed these microbes thrived in caves during the Precambrian Era, to escape harsh UV irradiation.
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