The posted coordinates place you in the middle of Fossil Grove; home to a small collection of 325 million year old fossilised Lycopod trees and one of the most fascinating (and under-appreciated) geological sites in all of Glasgow.
Somewhere nearby, a cache is hidden - but you will need to answer some geological questions in order to find it! The answers to all of the questions are avaliable online.
Volcanology
The May 1980 eruption of Mt St. Helens, Washington, USA had a VEI of A.
Mineralogy
Arkose is a sandstone with a mineralogical composition of at least BC % fieldspar.
Seismology
Rounded to the nearest whole number, the maximum possible intensity of the December 2005 Lake Tanganyika earthquake was D on the richter scale.
The December 2004 Indian Ocean earthquake had a hypocentre approximately E0 km underground.
Topography
Cairn Gorm in Scotland has a height of 1F45 m while Carrauntoohil in Ireland has a height of 1G39 m.
Geochronology
According to the official timescale of the International Commission on Stratigraphy (ICS), the Pliocene epoh is subdivided into H ages (or stages).
Planetary Geology
Triton, a moon of Neptune, was the first location in the solar system where active geological processes (cryovolcanoes) were observed. If the year when the moon was discovered by William Lassell is X, then IJ = X - 1767.
Final Coordinates
The cache can be found at: N55° AB.C(D+1)(E-1), W004° FG.HIJ.
The Series
The Physicist's Cache: GC83KVH
The Geologist's Cache: GC83MYG
The Biologist's Cache: GC83XTX