With elementary students it generally works better to provide this information orally rather than to give them the written table. Emphasize that the outline of the modern continent may have no relationship to the Mesozoic boundary. Ask students whether location X was land or ocean in the Mesozoic, according to their maps. For extra credit or homework, have them see how many possible interpretations they can make from the same data. No two maps should be identical.
Older students can explore ways to get more information from the data already in hand.
This activity is a simplified version of the process used in activities such as oil and gas exploration. In oil exploration, a geologist maps a variety of data, interpolates between the data points, and develops an interpretation which is usually in the form of a map. The vast majority of such wells do not produce any oil. The data from failed wells is incorporated into a revised interpretation and the process starts over. This activity provides an opportunity to make the point that it is O.K. to be wrong in science.