Horizons are defined at borehole contacts. Each contact that the user wishes to include in the construction of the solid must have a horizon ID. If the user wishes to ignore a contact, this can be done by setting the horizon ID to zero. Horizons are numbered consecutively in the order that the strata are “deposited” (from the bottom up).
To have GMS automatically assign horizon IDs to boreholes, you can use the Boreholes | Auto-Assign Horizons menu command. Depending on the number and complexity of your boreholes, this command may take a considerable amount of time.
Horizons are defined at borehole contacts (interface between different materials on a borehole log) by double clicking on a contact with the Select Contact tool. The Boreholes | Auto Select command can be helpful in assigning horizons to a large group of boreholes.
Horizons assigned to contacts on boreholes