Trum (geology)
In geology, a section branching off from a corridor is referred to as a run or runway . Other names are Beitrum or Nebentrum . The Gegentrum is the continuation of a gear on the opposite side of the valley.
"Trum (multiple dreams or rubble), in geology a narrow corridor, especially a not very powerful side corridor that branches off from the main corridor (cf. corridor)."
- Meyers 1905