Resumen del producto

Coastal lagoons show extensive benthic mats formed by filamentous cyanophytes, frequently associated to mangrove systems. These mats could have played and may still be playing an essential role in the geomorphology and origin of said lagoons through the development of pro-thrombolithic formations. Pro-thrombolites are the non-lithified phase preceding thrombolite formation. They develop from cyanophyte mats which have grown and continue to do extensively trapping and clotting sediments resulting in the accretion of lagoon margins including spites that support the formation of sand bars. Stratigraphic evidence also supports the hypothesis that pro-thrombolithic processes are responsible for the extensive ground formation that is either populated or occupied by mangrove forests. Furthermore, contrary to current acceptance, evidence shows that the ground where mangroves are anchored is most likely formed by entrapment, precipitation and consolidation of sediments do to the activity and growth of cyanophyte mats and their evolvement into pro-thrombolithic ground which is then opportunistically occupied by mangrove recruits. Observations in several localities in of B.C.S. support the hypothesis that pro-thrombolithic processes have promoted the formation of coastal lagoons throughout NW México and that the cyanophyte species involved are the same. Most recently, the hypothesis that structures representing a transition from soft cyanophyte mats to thrombolithic (consolidated clotted sediments) structures ought to exist was confirmed.

Palabras clave: lagunas costeras; protrombolitos; cianofitas

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