A geologist or exogeologist is an individual who conducts research and studies in the field of planetary geology.
In the 23rd and 24th centuries, Federation starships carried a geologist aboard as part of their complement of science division officers. (TOS episodes: "The Enemy Within", "The Squire of Gothos" & "That Which Survives"; TNG episode: "The Bonding")
A geologist was a student of geology. Jedi geologists were a variation of this, working through the Agricultural Corps.
Geologists mapped geology of planets and charted mineral resources.
In 40 ABY, a geologist and a minerals engineer ran some scans of the planet Mandalore over terrain bombarded by Yuuzhan Vong. Within craters, outcrops from a lode of beskar, Mandalorian iron, were exposed, turning the economy of Mandalore around.
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This spot marks the first sighting of the strange, rock-like creatures known as Pumicites.
Its coordinates are (-749, -539, -1647). It is roughtly 80 yards NE-E from the Grendel's Gulch's marker.

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