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Seep‐carbonates (¹³C‐depleted) are present at different levels within the Miocene terrigenous succession of Deruta (Marnoso‐arenacea Formation, central Italy); they are associated with pebbly sandstones and conglomerates in a tectonically active fan‐delta slope depositional system. Most of these seep‐carbonates are included in slide/slump horizons as scattered blocks. The occurrence of seep‐carbonates is clear evidence of the flow of methane‐rich fluids pervading the sediments. Fluids, probably of biogenic origin, may have reached the sea‐bottom through thrust faults and selectively infiltrated the more permeable coarse‐grained horizons deposited along the slope. Different stages of fluid emissions are documented: slow flux stage, corresponding to the development of large carbonate bodies and dense chemosynthetic communities; and fast fluid flow associated with intense carbonate brecciation, pipes …