Glossary
| Term | Definition |
|---|---|
| Unconformity | A break in the succession of sedimentary deposition, commonly associated with erosion of underlying rock units. Often marked by rock surfaces which are non-parallel above and below the unconformity. |
| Unrisked | Associated with an estimate of possible hydrocarbons for which a discount attributable to risk has not been applied. |
| Updip | Toward a higher elevation on a rock surface. |
| Uplift | Elevation by means of geological activity of one surface or area relative to another. |