Abstract
Synopsis: Shows of hydrocarbon minerals are widespread in the Old Red Sandstone of the Orcadian Basin. They are derived from lacustrine laminites within the basin. Hydrocarbon minerals resulting from local diagenesis occupy tension gashes and vugs in cherts and carbonate rocks. Other deposits occur in joints and mineral veins, particularly those relating to the Permo-Carboniferous intrusion of a monchiquite-camptonite suite of dykes and vents. Hydrocarbon minerals replaced sediments to a very limited degree.

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