| Rating | Solver | Clue |
|---|---|---|
| SEAMS | Coal strata | |
| CLUMP | The compressed clay of coal strata. | |
| MEASURE | Beds or strata; as, coal measures; lead measures. | |
| WANT | A depression in coal strata, hollowed out before the subsequent deposition took place. | |
| SEAM | A thin layer or stratum; a narrow vein between two thicker strata; as, a seam of coal. | |
| FAULT | To interrupt the continuity of (rock strata) by displacement along a plane of fracture; -- chiefly used in the p. p.; as, the coal beds are badly faulted. | |
| BASIN | ...rly where the strata dip inward, on all sides, toward a center; -- especially applied to the coal formations, called coal basins or coal fields.... | |
| LARAMIE GROUP | ...t contains beds of lignite, often valuable for coal, and is hence also called the lignitic group. See Chart of Geology. ... | |