| Summary: | The lagoa Salgada is situated on the north coast of the State of Rio de Janeiro, between the districts of Campos dos Goytacazes and São João da Barra, at 41o00’30’’ W and 21o54’10’’S. In the margins of the lagoon the presence of recent stromatolitic constructions was verified. The stromatolite may be defined as lithified biosedimentarystructure, growing through the increase of sediment blade trapping by the carbonate precipitation as result of microbian organism activity. The objective of this study was to describe and to determine the internal morphology of domal type stromatolite of the lagoa Salgada. Through cutting, three different stages wereobserved: the first (base) is present as a thrombolitic stage with spread blade; the second (intermediary) is a and continuous blade; the third (top) is stromatolitic and the most recent stage of the structure, presenting continuous blade and with interruptions rare. Besides the presence of cyanobacteria and mollusk shells, were observed also internee palinomorphs inside the domal stromatolite. Itwas possible to observe that filament cyanobacteria contributed to the formation of blade of domal stromatolite and the microgastropod contributed for the destruction of the blade.
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