The sedimentary record of the high-frequency Sinemurian cycles originated in the shallow carbonate
platform of the northern Iberian basin (NE Spain) show marked differences depending on the environment
in which they developed. Vertical facies distribution in shallowing upward cycles with intertidal laminated
caps has a great lateral homogeneity (more than 12 km across) with no significant variation. However, the
cycles dominated by grainy facies, mostly formed in the open marine wave-agitated areas, show rapid
lateral facies changes and irregular record of discontinuity surfaces. In this case, the number and distribution
of the cycles defined in a single log cannot be representative of the entire platform area. Accordingly, the
definition of cycles originated in these high-energy open platform areas should be based in the analysis of
laterally continuous outcrops