Geological technician
From Memory Alpha, the free Star Trek reference
A Geological technician is a technician who specializes in the technical aspects of geology. They are often a part of away teams conducting geological surveys on planets.
Crewman Fisher was the geological technician aboard the starship USS Enterprise in 2266. He was a part of the geological survey of planet Alfa 177 when he injured himself in a fall and required transport back to the Enterprise. (TOS: "The Enemy Within")
