Construct a stratigraphic graphSource:
Takes a data frame describing stratigraphic units and relations and turns it into a graph representation.
stratigraph(data, label, relation, direction = c("above", "below"))
Data frame of stratigraphic units, containing at least a unique label column and a column describing stratigraphic relations.
Name of the column containing labels of the stratigraphic units.
Name of the column describing the stratigraphic relations between units.
Direction described by
relation, i.e. are the units in that column "above" or "below" the ones in units. Default: "above".