What would be the predicted/calculated ages using several samples of soil with the help of carbon 14 test?
Radiocarbon dating cannot be used to date rocks or lava, only organisms that absorbed carbon from the atmosphere in the last 50'000 years or so.

The older the samples, the more difficult it is to get an accurate age because the amount of 14C remaining becomes close to zero and thus the more likely it is that a few atoms of 14C from sample handling or atmospheric exposure may significantly change the number. That is why, for instance, coal contains trace amounts of 14C. 

More generally, sample age does not always correlate with sample depth and it is strongly dependent on the geological setting. In a sedimentary basin, deeper rocks are older than shallower rocks but tectonic activity such as thrust faults and folds can upset this relationship.

In granitic and metamorphic terranes, there is no general correlation of age with depth, because granites intrude into older rocks