TimePeriods
From Species File Help
tblTimePeriods, shared across files, geologic time period
TimePeriodID, integer, 2 bytes, identifier for time period Name, text, 20 bytes maximum, name of geologic period MaxID, integer, 2 bytes, upper limit for values of TimePeriodID contained within this name ListLevel, integer, 2 bytes, level of dropdownlist for users to select time period
