This is a short overview. For the background — history, value over time and notable mines — see Oil Shale →
Occurs in: Sedimentary Beds and Seams →
A fine-grained sedimentary rock rich in kerogen, which yields a petroleum-like oil when heated (retorted). Mined and retorted on an industrial scale in central Scotland during the 19th and 20th centuries to produce paraffin, lubricating oils and other petrochemical products.