We present the results of stratigraphic mapping, paleomagnetic measurements and radiometric dating of lava profiles of 2.1 km total thickness in the Langidalur valley, Húnavatnssýsla, Northern Iceland. Seven reversals of paleomagnetic polarity occur in a composite lava section of 1.15 km thickness. Most of the lavas were emplaced between 8.2 and 7.3 million years ago. The area is fairly typical for the composition of the lava pile in Iceland, but instances of large tectonic tilts are encountered due to a NNW striking flexure. Unusual lava types, probably originating in nearby volcanic centers, were used as marker layers during the mapping.