on lap toplap geology

Wallace G. If such a hypothesis is not refuted, the geometrical relationships between the yellow strata and the basement must be interpreted as marine onlap. However, it is evident that the seismic line can be interpreted in a differently way , as illustrated on the next plate. Subsequently, following a small relative sea level fall, the coastal deposits were slightly shifted seaward and basinward, and so, the onlap of the yellow interval must be considered as a coastal onlap. As illustrated here, cross-bedding occurs at a very small scale.

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