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| AREA: Type location not available, point is placed on placename (2016) |
| Boundary stratotype (B): If a unit does not have a documented locality where both its base and its main body are sufficiently represented, the type locality for the lower boundary is defined by the boundary stratotype. |
| Hypostratotype (H): The second or third type locality of a unit that documents major regional variations. |
| O: Offshore type area. Point is placed at type well based on data from NPD (2016). |
| Stratotype (S): The main type locality and section which presently defines the unit. |
| Unit stratotype (U): If a unit does not have a documented locality where both its base and its main body are sufficiently represented, the type locality for the main body is defined by the unit stratotype. |