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Organic-rich sedimentary rocks
Organic-rich sedimentary rocks are a specific type of sedimentary rock that contains significant amounts (>3%) of organic carbon.〔Boggs, S., 2006, Principles of Sedimentology and Stratigraphy (4th), Pearson Prentice Hall, Upper Saddle River, N.J., 662 p.〕 The most common types include coal, lignite, oil shale, or black shale. The organic material may be disseminated throughout the rock giving it a uniform dark color, and/or may be present as discrete occurrences of tar, bitumen, asphalt, petroleum, coal or carbonaceous material. Organic-rich sedimentary rocks may act as source rocks which generate hydrocarbons that accumulate in other sedimentary "reservoir" rocks (see oil sands and petroleum geology).
==References==
ja:瀝青炭
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