The Flandrian or postglaciar transgression in the coast of Galicia, (NW of Spain), caused the flood of the final parts of the Atlantic Galician river systems with the consequent formation of the Galician Rías. The advance of the sea toward the continent produce the infilling of the river valleys by marine deposits. In this work is studied the postglaciar record in one of the so called Galician Rias Altas, Ría de Foz (Lugo) characterized by their small dimensions since in them the development of the previous river erosion to the transgression did not penetrate toward the interior of the continent as in other zones of the Galician coast. The studied record 5 m thick, not reaches the rock substrate and correspond to marine sediments. It is constituted totally by siliceous sands and bioclast. The sedimentary register start 10400 y. B.R and is transgresive until 8200 y B.P.when the sea level reach + 3 m o.p.s.l. Between 8200 y. B.R and 4000 y. B.R the sea level is regressive but never below -72 m. the present deep in the core. From 4000 y. B.P. to the present time the sea level rise continuously but never above of + 3 m o.p.s.l in the maximum. The results that are consistent with the equivalent record in other areas of the Galician coast and the Cantabrian border revealing an homogeneous behaviour for the all area during the Holocene
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