Distribution of calcareous algae, oncolites and stromatolites in the Wenlock-Ludlow boundary beds in Estonia.
Significance of microbialites, calcimicrobes, and calcareous algae in reefal framework formation from the Silurian of Gotland, Sweden.
Among bigger algal species, tough cement makers called crustose calcareous algae
help hold a reef together and create ridges that withstand pounding waves.
Plate 2: Calcareous algae of the Kuh-e-Surmeh section.
Calcareous algae, foraminifera and sequence stratigraphy of the Fahliyan Formation at Kuh-e-Surmeh, Geologia Croatica, 61(2-3): 215-237.
Paleontologists eventually settled on the two most likely relatives--sponges (which are often, but not universally, considered animals) and calcareous algae
(organisms simpler than true higher plants).
(including Dasyporella and Vermiporella) are the most important in situ microfossils in thin sections (up to 15%), but their overall contribution is low relative to metazoans.
These seaweeds have formed a tangled, almost impenetrable shag along the bared surfaces, effectively blocking the reestablishment of calcareous algae
, corals, and other organisms whose carbonate production contributes to the reef's expansion.
Numerous calcareous algae
have constituted an important part of lime-secreting and rock-forming organisms during the Earth's history.