Table 16. Seral stage definitions for biogeoclimatic zones in NDT4

Note: The mid-seral stage, between early and mature, is not designated.

[a] Seral stages can be defined by the ages presented in this table or by stand-level attributes.

[b] This represents an average value over large geographic areas for each NDT. Consequently, forests can be found that are older than the mean event interval, as the age definition of old seral sometimes specifies.