Constructs a table of directed edges between stratigraphic units based on a vector of relations (e.g. "above" or "below").

## Usage

`strat_connect(units, relations, direction = c("above", "below"))`

## Arguments

- units
Vector of unit labels.

- relations
Vector of relations.

- direction
Are the units in

`relations`

"above" or "below" the ones in`units`

?

## Value

A data frame of directed edges represented by `to`

and `from`

columns, which
can be used as the `nodes`

argument to `tidygraph::tbl_graph()`

.