Oil shale
Oil shale means a fine-grained sedimentary rock containing:
(1) Organic matter which was derived chiefly from aquatic organisms or waxy spores or pollen grains, which is only slightly soluble in ordinary petroleum solvents, and of which a large proportion is distillable into synthetic petroleum; and
(2) Inorganic matter, which may contain other minerals. This term is applicable to any argillaceous, carbonate, or siliceous sedimentary rock which, through destructive distillation, will yield synthetic petroleum.
Source
43 CFR § 3900.2
Scoping language
As used in this part and parts 3910 through 3930 of this chapter, the term: