BCal help system: The Tutorial
Step A15: Group priors elicitation II
The group priors elicitation page for Layer II is now shown. Again,
a form is given for each boundary parameter of the group. This time
we have some absolute a priori chronological information for one
of the boundary parameters. Recall that the pond was deliberately
back filled in 1941 AD. The late boundary parameter (beta 2) of this
group represents the calendar date associated with this event. We
can, therefore, assign an exact date to beta 2. This date is 9 cal
The relative a priori chronological information is already set.
We have already told BCal that Layer III abuts and is earlier than Layer
II. As a result, BCal automatically deduced that Layer II abuts and
is later than Layer III. All we need to do is check that this is
correct before proceeding.