Welcome.
The Zetec I-4 does have a timing belt. While Ford does not have a recommendaton, (as you are aware, if you have already read the Maintenance Schedule Booklet for the 1996 model), Gates, a belt manufacturer, recommends a 60K interval.
http://www.gates.com/downloads/download_common.cfm?file=TBR05.pdf&folder=brochure
Note that the Zetec I-4 has a non-interference engine and as such, if the timing belt were to break, it is not supposed to bend the valves (although some have said that their mechanics told them otherwise). If it breaks, it would be a great inconvenience but the PCM (computer) should show a code and turn on the Check Engine Light when the timing belt is not performing as it should.
If you do decide to change the timing belt as a preventative measure, you may want to consider changing the water pump also.
And should you send the Contour to a dealer, don't forget to have them change the PCV valve (free at 60K).
In the future, you may want to post Zetec Maintenance items in that forum.