Description Usage Arguments Details Value Note Author(s) See Also Examples
Returns the first and last appearance datums (FADs and LADs) for taxa in a stratigraphic column.
1 2 3 4 5 |
x |
an object of class strat.column. |
depths |
depths from which to calculate the datums |
skip |
a number of depths (levels) to skip, returning NA instead of values for FAD or LAD; defaults to 0. |
increasing.down |
FALSE (default) returns FADs less than or equal to LADs, as is the case when depths are measured up from the bottom of, e.g. a stratigraphic section; TRUE reverses FADs and LADs, as is the case when depths are measured from the surface in wells or cores. |
... |
not currently used. |
If depths
is provided, it will clobber x$depths
, should x$depths
exist.
a.datums
returns a data frame with columns fads
and lads
, each of which is a numeric vector giving the FAD or LAD of each taxon in the stratigraphic column. fads
and lads
return respectively just the fads and just the lads in a single named numeric vector.
Currently no other notes.
Walton Green
plot.strat.column
, stratigraph
1 2 3 | data(mohawk)
fads(as.strat.column(mohawk))
# should make mohawk a strat.column without coercion
|
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