get_last_common_stratum_between

get_last_common_stratum_between(first: HereditaryStratigraphicColumn, second: HereditaryStratigraphicColumn, confidence_level: float = 0.95) → HereditaryStratum | None

Get the most recent stratum in common between first and second, if any.

Common strata share identical rank and differentia. Returns None if no common strata exist between the two columns. Allows probability equal to 1 - confidence_level that the last true common stratum is before the stratum returned (i.e., strata were erroneously detected as common due to spurious differentia collisions).

See Also

calc_rank_of_last_retained_commonality_between :

Selects the stratum returned. See the corresponding docstring for explanation of parameters.