Recent and subfossil calcareous structures similar to Paleozoic marine problematic fossils known as Wetheredella Wood, 1948 have been found in a sea-linked, midly alkaline crater lake on Satonda Island, Indonesia. They are generated by calcifying mats of coccoid cyanobacteria (Pleurocapsa group) growing in crypts and crevices between the foliaceous thalli of calcareous red algae and agglomerations of nubecullinid foraminifers which form small reefs along the lake shore. The Wetheredella-like structures occur at depths ranging from near the water surface down to about 8 m
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Kaźmierczak et al. (1992) studied this question.
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