I think geology is a scientific field that its not value. In my opinion its one of the most interesting fields that you can learn. In the stones is hidden the secret of humanity but geology has a lot of field where you can stand out:
Speleology
Stratigraphy
Oil Geology
Economic Geology
Structural Geology
Gemology
Historical geology
Planetary Geology
Regional Geology
Geomorphology
Geochemistry
Geophysics
Hydrogeology
Mineralogy
Paleontology
Petrology
Sedimentology
Seismolog
Tectonics
Vulcanology