The term pseudobioherm is used for fossiliferous calcareous bodies with a bioherm-like shape but neither built by organisms, nor bulging at the sediment/water interface. Jurassic pseudobioherms of southeastern France are among the first fossiliferous carbonate bodies whose relation to deep-sea seeps was recognized. They are built by carbonate precipitation in the sediment and they contain mainly infaunal non-building animals (chiefly bivalves). They are related to active synsedimentary faults that allowed the migration of fluids to the sea floor. Chemosynthetic life could occur in the vicinity of seeps, and early diagenetic carbonate precipitated
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Gaillard et al. (1992) studied this question.