Stratigraphic Units
The Stratigraphic Units branch of the Interpretation Tree (called Zone in earlier versions) holds the project's stratigraphic units. A stratigraphic unit is the interval between two contacts, built on the outcrop from the polylines that trace them and drawn as a filled body. Its colour is the colour of its unit in the Units list.
Source resources: IDR_IT_ZONE_GROUP, IDR_IT_ZONE.
Building a stratigraphic unit
- Trace the two bounding contacts as polylines, each with its contact set (the polyline's Contact property, or the active contact in the Active Descriptor while you digitise).
- Right-click the Stratigraphic Units header and choose New. A unit named Unit 1, Unit 2 and so on is added.
- Select it and set, in the Properties panel, its Younger Contact, its Older Contact and the Unit it represents.
- Make sure the polylines of both contacts are visible, then right-click the unit and choose Regenerate.
Properties
| Property | Meaning |
|---|---|
| Name | The name of this object in the tree. |
| Younger Contact | The contact on the unit's upper (younger) side, chosen from the Contacts list. |
| Older Contact | The contact on the unit's lower (older) side, chosen from the Contacts list. |
| Unit | The stratigraphic unit (formation, member or bed) between the two contacts, chosen from the Units list. It sets the colour. |
| Variation | How far into and out of the outcrop the colouring reaches. |
| Orientation | The dip and azimuth of the unit, taken from its contact polylines on Regenerate. |
| Pillars | The height of each pillar across the unit, in metres, with its true stratigraphic thickness (TST). Read-only. |
Item Context Menu
Right-click a stratigraphic unit.
Actions
- Regenerate — Rebuild the unit from the visible polylines of its younger
and older contacts. If nothing is built, check that both sets of polylines are
visible and that their contacts match the unit's. (
ID_ZONE_REGENERATE) - Delete — Delete this unit from the project. (
ID_POPUP_ITEM_DELETE)
Group Context Menu
Right-click the Stratigraphic Units branch header.
Actions
- New — Create a new stratigraphic unit. (
ID_GROUPPOPUP_NEW) - Use Own Display Properties — Let this group carry its own display settings instead of inheriting the parent's. (
ID_GROUP_USE_OWN_DISPLAY_PROPS)
The Geobody & Unit Infill option in the model view properties controls whether geobodies and stratigraphic units are drawn as filled volumes.