Source Rock for the World's Largest Oil Field

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This outcrop is the geologic type section for the Qusaiba Member, which is a primary source rock for the world's largest oil field (Ghawar). The organic-rich shale of the Lower Silurian Qusaiba Member, of the Qalibah Formation, is one of the most prolific source rocks on the planet. It provides more than 90 percent of the Paleozoic light oil and gas accumulations known on the Arabian Peninsula.

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