Mircro-organisms and the presence of syngenetic pyrite

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Abstract
Summary: Certain beds of the Scottish Lower Carboniferous Oil Shale Group contain numerous small granules of pyrite. Isolation and subsequent solution of this pyrite has revealed the presence of a hitherto unknown group of microfossils clearly contained within the pyrite. Two new monotypic genera, Pyritosphaera and Pyritella , are described and their essential role in the production of hydrogen sulphide is suggested in relationship to the formation of syngonetic pyrite.