The sulfur occurs as fine disseminations in Miocene anhydrite and in more coarsely crystalline form in fissures and cavities in anhydritic dolomite and in interstices between rosettes of eucrystalline aragonite. The aragonite layers overlie anhydrite and thus occupy an anomalous position in the normal evaporite sequence; their formation, together with that of the associated sulfur, is attributed to reduction of anhydrite by inorganic processes at moderate temperatures. The reducing agents might have been hydrocarbons, in view of the occurrence of petroleum at depth.

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