An algal mat is a layer of usually filamentous algae on marine or fresh water soft bottoms. It may be considered one of many types of microbial mats. Algae and cyanobacteria are ubiquitous, often forming within the water column and settling to the bottom. In shallow environments, they are often desiccated and revived with the next introduction of ...
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http://en.wikipedia.org/wiki/Algal_mat
A layered communal growth of algae observed in fossils an in present day tidal zones associated with
Found on
http://www.encyclo.co.uk/local/22392
A layered communal growth of algae observed in fossils and in present day tidal zones associated with carbonate sedimentation.
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http://www.scientificpsychic.com/etc/geology-glossary.html
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