Abstract

A thick deep-sea clastic succession in the Upper Carboniferous of the Cantabrian Mountains, Spain, is identified as a small (radius some 10 km) deep-sea fan, called the Pesaguero Fan. The fan succession is composed of facies triplets, each of which consists of a mudstone blanket, a sandstone lobe, and a conglomerate tongue. A facies triplet represents a complete cycle of progradation of a major, active fan lobe (sandstone and conglomerate) over a previously inactive part of the fan (mudstone). New lobes originate by avulsion from the inner fan environment. The distribution in space and time of individual fan lobes may be controlled by the combined influence of gradient advantage, the Coriolis effect, and sea level change.

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