| Lat / long: | 45.85186, -103.12557 |
| Secondary: | Lignite |
| Tertiary: | Natural Gas, Sand and Gravel, Construction, Petroleum (Oil) |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Occurrence |
| Structure: | THE RALPH QUADRANGLE LIES ON THE SOUTHWEST FLANK OF THE DAKOTA (WILLISTON) BASIN AND IS CHARACTERIZED BY A REGIONAL DIP OF 10 FT/MI (1.89 M/KM). MINOR FAULTS AND SHALLOW FOLDS, AMPLITUDE AND DISPLACEMENT LESS THAN 20 FT (6.10 M), ARE PRESENT, BUT HAVE NO PERSISTENT STRIKE. |
| MRDS | SD00857 |
| DEP | 60001100 |
| Reference | STEVENSON, ROBERT E., 1957, RALPH QUAD, SOUTH DAKOTA GEOLOGICAL SURVEY |