Based on the information that Fossil A is found closer to the surface compared to Fossil B, the most logical conclusion is:
Fossil B is most likely older than fossil A.
This conclusion is based on the principle of stratigraphy, where lower layers of rock (and the fossils within them) tend to be older than the layers above them. Therefore, since Fossil A is found closer to the surface, it is generally considered to be younger than Fossil B.